Agilent Technologies 7697A Operation Manual
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Agilent Technologies 7697A Operation Manual

Headspace sampler
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Agilent 7697A
Headspace Sampler
Operation
Agilent Technologies

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  • Page 1 Agilent 7697A Headspace Sampler Operation Agilent Technologies...
  • Page 2 A CAUTION notice denotes a hazard. It prior agreement and written consent from permitted by applicable law, Agilent calls attention to an operating Agilent Technologies, Inc. as governed by disclaims all warranties, either express procedure, practice, or the like that, if United States and international copyright...

  • Page 3: Table Of Contents

    Contents Introduction Introduction The Agilent 7697A Headspace Sampler About This Manual Getting Familiar with the Headspace Sampler The Operation Workflow Routine Operation Workflow Method Development Workflow The Keypad The General Data Entry Keys The Run Keys The Component Keys The Adv Function Key...
  • Page 4 Sample Vials Sample Vial Types Sample Vial Septa and Caps Vial Labels Filling Sample Vials To Cap a Sample Vial To Park or Unpark the Tray (111 Vial Model) To Install a Vial Rack (111 Vial Model) To Load a Sample into the Tray (111 Vial Model) To Load a Sample into the Tray (12 Vial Model) Methods What Is a Method?
  • Page 5 To Load a Sequence To Edit a Sequence To Delete a Sequence Method Sequence Actions Running Samples To Run a Series (Sequence) of Samples To Pause a Running Sequence To Stop a Running Sequence To Run a Priority Sample During a Sequence To View Vial and Sequence Status Readiness status Setpoint status...
  • Page 6 Operation...
  • Page 7 Agilent 7697A Headspace Sampler Agilent 7697A Operation Introduction Introduction The Agilent 7697A Headspace Sampler About This Manual Getting Familiar with the Headspace Sampler This guide describes how to operate the Agilent 7697A Headspace Sampler during typical operation. Agilent Technologies...

  • Page 8: Introduction

    Introduction Introduction Headspace analysis is a technique for analyzing volatile organic compounds using gas chromatography. Headspace analysis samples the ambient volume above a sample matrix, where the volatile compounds exist in gaseous form at predictable levels. Headspace analysis is useful for situations where: •...

  • Page 9: The Agilent 7697A Headspace Sampler

    Introduction The Agilent 7697A Headspace Sampler The Agilent 7697A Headspace Sampler (HS) is a pressure- loop headspace sampling system with either a 12- vial or 111- vial capacity. If configured for 12 sample vials, the HS uses a single- vial oven to equilibrate the sample at the desired temperature.

  • Page 10: About This Manual

    Introduction About This Manual This manual described the concepts and tasks needed for routine headspace sampler operation. For information needed to perform more advanced tasks and method development, see the Advanced Operation Guide. Operation...

  • Page 11: Getting Familiar With The Headspace Sampler

    Introduction Getting Familiar with the Headspace Sampler Tray gantry Vial racks Transfer line Tray Priority vial positions Display Keypad On/Off switch Figure 1 111 Vial model—front view Tray lid Sample loop cover Display Transfer line Keypad On/Off switch Figure 2 12 Vial model—front view Operation...
  • Page 12 Introduction Gas connections Voltage label Communications connections Power plug Figure 3 12 Vial model—back view (111 vial model is similar) Operation...

  • Page 13: The Operation Workflow

    Agilent 7697A Headspace Sampler Agilent 7697A Operation The Operation Workflow Routine Operation Workflow Method Development Workflow This section describes the basic work flow for using the headspace sampler. Agilent Technologies...

  • Page 14: Routine Operation Workflow

    The Operation Workflow Routine Operation Workflow Figure 4 summarizes the normal operating workflow for headspace analysis. This workflow assumes that the headspace sampler is set up and that the methods and samples are known. Start Up the Headspace Sampler. Load Method. Prepare Samples.

  • Page 15: Method Development Workflow

    The Operation Workflow Method Development Workflow Figure 5 summarizes the workflow for developing methods. For details about method development, refer to the Advanced Operation Guide. Start Up the Headspace Sampler. Start. Configure. Evaluate. Create Method. If Needed, Refine Method. Prepare Samples. Re-evaluate.
  • Page 16 The Operation Workflow Operation...

  • Page 17: The Keypad

    Keypad Functionality When the HS Is Controlled by an Agilent Data System Headspace Sampler Status Logs This section describes the basic operation of the Agilent 7697A HS keypad. The keypad provides access to all instrument functionality. For additional details on keypad functionality, see the Advanced Operation Guide.

  • Page 18: The General Data Entry Keys

    The Keypad The General Data Entry Keys Use these keys to enter setpoints, make selections, and turn on or turn off HS components. General data entry keys Mode/Type Accesses a list of possible parameters associated with a component’s nonnumeric settings. For example, when selecting the vial fill mode, press [Mode/Type] to list the vial fill mode options.

  • Page 19: The Run Keys

    The Keypad The Run Keys Use these keys to start sample preparation, stop preparation, and move the sample tray prior to loading sample vials. Run keys Stop During a sequence: • Press once to pause the sequence. Current samples continue processing, but no new samples will be started.

  • Page 20: The Component Keys

    The Keypad The Component Keys Use these keys to access method temperatures, timing events, flows and pressures, vial fill modes, and similar parameters. To display the current settings, press any one of these keys. More than three lines of information may be available. Use the scroll keys to view additional lines, if necessary.
  • Page 21 The Keypad immediately changes that setting in the current method, and the HS will begin to adjust to the new setting, if appropriate. Operation...

  • Page 22: The Adv Function Key

    The Keypad The Adv Function Key Use the [Adv Function] key to access advanced HS method parameters. Function key Adv Function Use to access parameters for: • Sample loop and sample probe purge between sequences • Headspace extraction mode • Method sequence actions •...

  • Page 23: The Status Key

    The Keypad The Status Key Use the Status key to learn about the current HS state. Status key Status Toggles between sequence, setpoint, and vial status information and messages. Also displays “ready,” “not ready,” and “fault” information. When the Not Ready status light is blinking, a fault has occurred.

  • Page 24: The Info Key

    The Keypad The Info Key For context- sensitive help, press [Info]. For example, if you press [Info] on a setpoint entry, the help provided would be similar to: Enter a value between 0.00 and 999.990 minutes. Info key Info Provides help for the currently shown parameter. For example, if Vial equib time is the active line in the display (has a <...

  • Page 25: The Supporting Keys

    The Keypad The Supporting Keys Use these keys to view and set configuration parameters, to set options, and to view instrument history data. Supporting keys Logs Toggles between the Sequence Log, the Event Log, and the Maintenance Log. The information in these logs can be used to support Good Laboratory Practices (GLP) standards.

  • Page 26: The Method Storage And Automation Keys

    The Keypad The Method Storage and Automation Keys These keys are for loading and storing methods and sequences locally on your HS. They cannot be used to access methods and sequences stored by your Agilent data system. Method storage and automation keys Load...

  • Page 27: The Service Mode Key

    The Keypad The Service Mode Key Use this key to access service information and procedures. Service Mode Service Mode Use to access maintenance functions and settings, service counters, vial leak tests, and diagnostics for the HS. See the Advanced Operation Guide for details.

  • Page 28: Keypad Functionality When The Hs Is Controlled By An Agilent Data System

    The Keypad Keypad Functionality When the HS Is Controlled by an Agilent Data System While under data system control, the keypad may be locked for general use. This locking feature prevents a user from unintended changes to the headspace method while the data system controls the instrument.

  • Page 29: Headspace Sampler Status

    The Keypad Headspace Sampler Status When the HS is ready to begin the current sequence, the display screen shows a Ready status, as shown below: STATUS - Ready Ready for start sequence Alternatively, when a component of the HS is not ready to begin a run, the Not Ready indicator lights, and the status display shows Not Ready and explains why the HS is not ready.

  • Page 30: Error Conditions

    The Keypad intervention. Depending on the type of error, the HS emits no beep or a single beep. A series of warning beeps sounds before a flow shutdown occurs. After a short time the component with the problem shuts down, the HS emits one beep, and a brief message displays.

  • Page 31: Status Indicators

    The Keypad Status indicators The front panel display provides five (5) indicator LEDs to show instrument status. STATUS - READY Ready for start sequence Tray Park When lit, indicates the tray is parked. (111 Vial model) Lights when the HS is processing samples. Sleep Lights when the HS is in sleep mode.

  • Page 32: Logs

    The Keypad Logs Three logs are accessible from the keypad: the run log, the maintenance log, and the system event log. To access the logs, press [Logs] to toggle to the desired log. The display will indicate the number of entries the log contains. Scroll through the list.

  • Page 33: Consumables

    Consumables for Headspace Analysis This section lists commonly- used parts, such as vials and sample loops, needed for routine operation of the Agilent 7697A Headspace Sampler. Procedures for replacing these parts can be found in this manual or in the Maintenance manual.

  • Page 34: Consumables For Headspace Analysis

    • 1/8-in. nylon tube fitting plug 0100-2414 • 1/16-in. stainless steel ZDV plug (6 port valve cap) G6600-80039 Tray vial rack set, 7697A (3 racks) G4564A Tray vial rack G4556-60019 Tray vial rack labels G4556-90500 Universal/external split vent trap with 3 cartridges,...
  • Page 35 Consumables Table 2 Headspace sampler transfer line parts (continued) Description Part number Ferrule, polyimide Valcon, 5/pk 0.53 mm, 1/32 in. for tubing OD 0.50  0.80 mm 0100-2595 0.25, 0.32 mm, 1/32 in. for tubing OD 0.25  0.40 mm 5190-1437 Septum nut, transfer line, for split/splitless and G3452-60835...
  • Page 36 Consumables Table 3 Headspace sampler sample loops (continued) Description Part number 0.1 mL G4556-80113 0.5 mL G4556-80115 1 mL G4556-80116 3 mL G4556-80118 5 mL G4556-80119 Adapters for sample loops Sample loop adapter: G4556-20177 1 ea. used with 0.025, 0.05, and 0.10 mL sample loops 2 ea.

  • Page 37: Sample Vials

    To Install a Vial Rack (111 Vial Model) To Load a Sample into the Tray (111 Vial Model) To Load a Sample into the Tray (12 Vial Model) This section discusses sample vial selection, sample preparation, and vial handling with the Agilent 7697A Headspace Sampler. Agilent Technologies...

  • Page 38: Sample Vial Types

    Sample Vials Sample Vial Types The headspace sampler accepts 10- mL, 20- mL, or 22- mL sample vials. Set the vial size in the method (see “To Create Method”). The vial size can change with each new method used in a sequence, but not within a method. Using a different vial size than expected by the method causes a run- time exception.

  • Page 39: Sample Vial Septa And Caps

    Sample Vials Sample Vial Septa and Caps There are two types of septa used with crimp caps and screw- on caps, each with different resealing characteristics and different resistance to solvents. Septum material Compatible with Incompatible with Resealability Maximum temperature* PTFE/butyl rubber PTFE resistance until punctured, Chlorinated solvents,...

  • Page 40: Vial Labels

    Sample Vials Vial Labels Make sure that any label and ink can withstand the oven heat C A U T I O N without degrading. If using labels with a 111 vial model, the label needs to conform to the dimensions below. If also using the optional barcode reader, the barcode labels must conform to the general dimensions for labels, plus the placement requirements shown.

  • Page 41: Filling Sample Vials

    Sample Vials Filling Sample Vials In general, fill sample vials about half way. Although sample amounts can vary depending on the analysis, do not fill vials more than the amount shown in Figure 8. Filling the vial correctly ensures that the sampling probe will not contact with the matrix during sampling.

  • Page 42: To Cap A Sample Vial

    Sample Vials To Cap a Sample Vial The vial must be sealed properly to insure that the headspace gases do not escape prematurely. For crimp top vials, use a crimper designed for headspace vials with 20- mm caps to seal the vials. Screw caps and screw top vials are also available.
  • Page 43 Sample Vials Off-center Centered No folds or wrinkles Folds and wrinkles Acceptable Unacceptable Figure 9 Acceptable and unacceptable vial caps Check each vial for proper crimping: • Be sure there are no folds or wrinkles on the part of the cap that wraps under the neck of the vial.

  • Page 44: To Park Or Unpark The Tray (111 Vial Model)

    Sample Vials To Park or Unpark the Tray (111 Vial Model) Parking the tray moves the tray gantry to a safe position. When parked, you can load vials into the racks, or install and remove racks from the HS. Press [Tray Park/Carousel Advance] to park the tray. The display reads: TRAY PARKED Tray Park - Unpark tray...

  • Page 45: To Install A Vial Rack (111 Vial Model)

    Sample Vials To Install a Vial Rack (111 Vial Model) Press [Tray Park/Carousel Advance] to “park” the tray (move the gantry to a rest position for easy access to the vial rack area). When loading a tray rack with sample vials, avoid excessive tray C A U T I O N motion.

  • Page 46: To Load A Sample Into The Tray (111 Vial Model)

    Sample Vials To Load a Sample into the Tray (111 Vial Model) Press [Tray Park/Carousel Advance] to “park” the tray (move the gantry to a rest position for easy access to the vial racks). Place the capped sample vials into the tray as desired. Figure Figure 11 Tray vial positions Press [Tray Park/Carousel Advance] to prepare the tray for...

  • Page 47: To Load A Sample Into The Tray (12 Vial Model)

    Sample Vials To Load a Sample into the Tray (12 Vial Model) Open the tray cover. See Figure Tray cover Figure 12 Opening the tray cover A label to the left of each vial position denotes the number of that position. See Figure Operation...
  • Page 48 Sample Vials Figure 13 12 Vial tray positions If the desired vial position is not available, press [Tray Park/Carousel Advance] to rotate the tray. Place the capped sample vials into the tray as desired. Operation...

  • Page 49: Methods

    Agilent 7697A Headspace Sampler Agilent 7697A Operation Methods What Is a Method? Method Parameter Summary To Create a Method To Save (Store) a Method To Edit a Method To Load a Method To Delete a Method To Determine the GC Cycle Time...

  • Page 50: What Is A Method

    A method is the collection of setpoints needed for the headspace sampler to prepare a sample and inject it into the gas chromatograph. The Agilent 7697A Headspace Sampler can store up to 32 methods internally, plus several built- in methods. The primary parts of the method control the parameters for: •...

  • Page 51: Data System Methods

    Methods Method Comments Wake Use the Wake method to load settings after the sleep period ends, for example, to warm the vial oven or increase gas flows. If desired, the wake method can be simply the last analytical HS method run. The wake method is editable.

  • Page 52: Method Parameter Summary

    Methods Method Parameter Summary This section lists method parameters, along with a brief description of each one. For more detailed information, see Advanced Operation Guide. Table 5 Common method parameters Parameter Enabled in modes Description [Temp] key Oven Oven temperature for vial equilibration. Loop/Valve Temperature of the sample loop and valve.
  • Page 53 Methods Table 5 Common method parameters (continued) Parameter Enabled in modes Description Vial size Select the sample vial size for all vials using this method. Shaking Set the level of shaking for the sample during equilibration in the oven. (111 vial model only) [Carrier] key Pressure (read only display) Carrier control: GC Control...

  • Page 54: To Create A Method

    Methods To Create a Method To create a basic method, you will access the method parameters using the 4 component keys, in order: [Temps], [Times], [Vial], and [Carrier]. For a listing of commonly- used parameters, see “Method Parameter Summary”. When the HS is not processing samples, press [Temps]. The display shows the current oven, loop/valve, and transfer line temperature setpoints and actual temperatures.
  • Page 55 Methods Scroll to Loop fill mode, then press [Mode/Type] to display the selections for the sample loop fill mode. Select the desired loop fill mode. Enter any sample loop fill mode parameters, pressing [Enter] after each. Scroll to Vent after extraction. Press [On/Yes] to vent the sample loop after the last each extraction, or [Off/No] to leave the loop as- is.

  • Page 56: To Save (Store) A Method

    Methods To Save (Store) a Method To save a method: Press [Method]. Scroll to the method number to save. Press [Store]. When prompted, press [On/Yes] to save, or [Off/No] to return to the selection list. Alternately: Press [Store]. When prompted, press [Method]. When prompted, scroll to the desired method number to save.

  • Page 57: To Edit A Method

    Methods To Edit a Method To edit a method: Load the desired method. See “To Load a Method”. Edit the method parameters as desired. See “To Create a Method”. When done, save the method. See “To Save (Store) a Method”. Operation...

  • Page 58: To Load A Method

    Methods To Load a Method To load a method: Press [Load]. When prompted, press [Method]. When prompted, select the method to load from the list, then press [Enter]. When prompted, press [On/Yes] to load the selected method, or [Off/No] to return to the selection list. Alternately: Press [Method].

  • Page 59: To Delete A Method

    Methods To Delete a Method You can delete only the internal, user- defined methods. To delete a method: Press [Method]. Scroll to the user- defined method to delete. Press [Delete]. When prompted, press [On/Yes] to confirm. Alternately: Press [Delete]. When prompted, press [Method]. When prompted, scroll to the method number to delete, then press [Enter].

  • Page 60: To Determine The Gc Cycle Time

    Methods To Determine the GC Cycle Time The HS uses the GC cycle time to calculate throughput and timing. An accurate GC cycle time is crucial to optimizing throughput and for correctly processing samples. If the GC cycle time is too long, this can cause: •...

  • Page 61: Validating The Gc Cycle Time

    Methods Validating the GC cycle time Look at the GC run time. The GC cycle time cannot be less than the total run time. Look at the GC post run program duration. The GC cycle time cannot be less than the total run time plus the post run program duration.
  • Page 62 Methods Operation...

  • Page 63: Sequences

    Agilent 7697A Headspace Sampler Agilent 7697A Operation Sequences What Is a Sequence? Priority samples Sequences and Throughput (111 vial model) To Create a Sequence To Save (Store) a Sequence To Load a Sequence To Edit a Sequence To Delete a Sequence...

  • Page 64: What Is A Sequence

    Sequences What Is a Sequence? A sequence for the 7697A Headspace Sampler is an ordered series of sample vials to prepare and inject, including the method needed to prepare each vial. For the 7697A HS: • All sample processing occurs in a sequence. To run a sample, there must be a sequence defined.

  • Page 65: How Many Sequences Can The Hs Store

    Sequences When more than one consecutive entry exists for a vial, and the entries use the same method, the HS will puncture the vial once, then make the extractions and injections. The HS will not perform multiple vial punctures. • Extraction mode is Concentrated. If a vial appears more than once in a sequence, or if the number of injections is greater than one, the vial is completely reprocessed for each entry or injection.

  • Page 66: Priority Samples

    Sequences Priority samples A priority sample is a vial that you want to run as soon as possible, before other vials in the currently- running sequence. Use the priority sample feature to insert one or more special vials into the current sequence without stopping the sequence, editing it, and restarting it.

  • Page 67: Priority Samples Using An Agilent Data System

    Sequences • If the vial is not present, a vial not found error occurs. (See the Advanced Operation Guide for information about how to set HS handling of missing vials.) • The HS continues to process any vial it is handling before it looks for the new priority sample vial.

  • Page 68: Sequences And Throughput (111 Vial Model)

    Sequences Sequences and Throughput (111 vial model) The HS optimizes throughput by checking the temperature and shaking parameters for the vials specified in the current sequence. When consecutive vials share the same temperature and shaking settings, the HS will examine the timing parameters for the samples, then calculate the best times to place each vial into the oven.

  • Page 69: To Create A Sequence

    Sequences To Create a Sequence To create a new sequence: Press [Seq]. Select the method for the first vial range. Press [Mode/Type]. Scroll to the desired method. Pres [Enter] to select this method. Enter the range of vial to prepare with this method. •...

  • Page 70: To Save (Store) A Sequence

    Sequences To Save (Store) a Sequence Storing a sequence saves the current sequence to nonvolatile memory. You do not have to be viewing the current sequence to save it. If editing the sequence, save it as follows:. Press [Store]. When prompted, press [Sequence]. When prompted, scroll to the desired sequence number to save.

  • Page 71: To Load A Sequence

    Sequences To Load a Sequence To load a sequence: Press [Load]. When prompted, press [Seq]. When prompted, select the sequence to load from the list, then press [Enter]. When prompted, press [On/Yes] to load the selected sequence, or [Off/No] to return to the selection list. Alternately: Press [Seq].

  • Page 72: To Edit A Sequence

    Sequences To Edit a Sequence To edit a sequence: If desired, load the sequence to edit. Scroll through each line of the sequence. • Change the method, vial range, and injections per vial for each line as desired. • Delete the entire current line by pressing [Delete]. Press [On/Yes] to confirm, or [Off/No] to cancel.

  • Page 73: To Delete A Sequence

    Sequences To Delete a Sequence To delete a sequence: Press [Delete]. When prompted, press [Seq]. When prompted, scroll through the list of sequences to the desired sequence. Press [Enter] to select this sequence. When prompted, press [On/Yes] to confirm and delete the sequence, or [Off/No] to cancel.

  • Page 74: Method Sequence Actions

    Sequences Method Sequence Actions When the HS encounters certain problems during a sequence, it has the ability to skip vials, continue anyway, or pause the sequence. The settings to control HS behaviors during sequence execution are called sequence actions. Sequence actions are part of the HS method, and therefore can change from sample to sample during sequence execution.

  • Page 75: 8 Running Samples

    To Stop a Running Sequence To Run a Priority Sample During a Sequence To View Vial and Sequence Status Sequence Control with an Agilent Data System To run samples on the Agilent 7697A Headspace Sampler, create and run a sequence. Agilent Technologies...

  • Page 76: To Run A Series (Sequence) Of Samples

    Running Samples To Run a Series (Sequence) of Samples Create or load the first method. (This prepares the HS temperatures and flows for the first sample.) • If needed, create the method. See “To Create a Method”. • If already created, load the existing method. See “To Load a Method”.

  • Page 77: To Pause A Running Sequence

    Running Samples To Pause a Running Sequence Press [Stop] once. • All vials currently in process will continue processing through injection (and return to the tray). • No more vials will start processing. Operation...

  • Page 78: To Stop A Running Sequence

    Running Samples To Stop a Running Sequence To stop a running sequence, press [Stop] twice within 5 seconds. The current sample immediately aborts. All processing stops. All vials are returned to the tray (111 vial model). No further vials are processed. Operation...

  • Page 79: To Run A Priority Sample During A Sequence

    Running Samples To Run a Priority Sample During a Sequence This feature is available only with the 111 vial model, and only when N O T E operating in standalone mode. If using an Agilent data system, edit the running sequence instead. You may run only 3 priority samples during a sequence.
  • Page 80 Running Samples The new vial will be processed using the method for the last vial placed into the oven. • The tray will check the first priority sample position for a sample vial as soon as it is ready to load another sample into the oven.

  • Page 81: To View Vial And Sequence Status

    Running Samples To View Vial and Sequence Status While a sequence is running, press [Status] to view the status of the sequence and the individual vials. The [Status] key cycles through displays for readiness state, temperatures and setpoints, and vial status. Readiness status This display shows the overall state of the headspace sampler, along with messages regarding system readiness.

  • Page 82: Vial Status

    Running Samples Vial status This display shows the status information for the next few vials listed in the sequence. The HS will display: • Time until a vial operation is scheduled to occur. • Current or next vial operation (for example, equilibrating, injecting, loading, and so forth).

  • Page 83: Sequence Control With An Agilent Data System

    Running Samples Sequence Control with an Agilent Data System In general, when using an Agilent data system, use the data system for starting, stopping, and pausing a sequence. However, an Agilent data system can deactivate the [Start] key. Otherwise, pressing the [Start] and [Stop] keys on the HS provides the same functionality when in standalone control or data system control.
  • Page 84 Running Samples Operation...

  • Page 85: Configuration

    Agilent 7697A Headspace Sampler Agilent 7697A Operation Configuration What is Configuration? To Configure the Headspace Sampler Resource Conservation This section describes how to configure the Agilent 7697A Headspace Sampler before use. Agilent Technologies...

  • Page 86: What Is Configuration

    Configuration What is Configuration? Most of the hardware used in the headspace sampler (HS) is known by the programs that control it. For example, the HS can detect whether or not a transfer line is installed, and it knows whether it has a 12 vial or 111 vial tray. However, some settings, such as gas types, sleep and wake modes, sample loop size, and similar are not detected.

  • Page 87: To Configure The Headspace Sampler

    Configuration To Configure the Headspace Sampler Press [Config] to access the configuration parameters. Table 6 lists the most common parameters, along with brief descriptions. Refer to the Advanced Operation Guide complete information. Table 6 Most common configuration parameters Setting Comments Vial Gas type Use the [Mode/Type] key to select the correct gas type.

  • Page 88: Resource Conservation

    Agilent Technologies Resource Conservation The Agilent 7697A Headspace Sampler provides the following features to conserve resources: • Instrument schedule (sleep and wake methods): Load a method at a specified time during the day to reduce flows and temperatures, then load another method to restore them before operation.

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