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Summary of Contents for EUTECH INSTRUMENTS CARBON DIOXIDE GAS
- Page 1 Instruction Manual Carbon Dioxide Electrode EUTECH INSTRUMENTS PTE LTD. INSTRUCTION MANUAL CARBON DIOXIDE ION ELECTRODE...
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Page 2: Table Of Contents
Instruction Manual Carbon Dioxide Electrode TABLE OF CONTENTS GENERAL INSTRUCTIONS ............................3 Introduction ................................3 Required Equipment..............................3 Required Solutions ..............................3 GENERAL PREPARATION ............................4 Electrode Preparation .............................. 4 Checking Membrane ............................... 4 Changing the Membrane ............................4 Connecting the Electrode to the Meter........................4 Electrode Slope Check (with pH/mV meter)...................... -
Page 3: General Instructions
INSTRUCTION MANUAL GENERAL INSTRUCTIONS Introduction Eutech Carbon Dioxide Gas-Sensing Electrode is used to measure carbon dioxide, carbonate, and bicarbonate in aqueous solutions quickly, simply, accurately, and economically. With a flow- through cap, the electrode can be used in flow-through applications. -
Page 4: General Preparation
Instruction Manual Carbon Dioxide Electrode water, add 294 grams of Na O 7 .2H O (sodium citrate dihydrate). Swirl the flask gently to dissolve the solid. Fill the flask to the mark with distilled water. Stir the solution and adjust the pH of the solution to 4.5 with concentrated HCl. This buffer is used to adjust the pH of the solution to the operating range of the electrode. -
Page 5: Electrode Slope Check (With Ion Meter)
Instruction Manual Carbon Dioxide Electrode Using a pipet, add 1 ml of 0.1M or 1,000 ppm standard into the solution. When the reading has stabilized, record the mV value. Using a pipet, add 10 ml of the same CO standard used above to the beaker. When the reading has stabilized, record the mV value. -
Page 6: Sample Storage
Instruction Manual Carbon Dioxide Electrode All samples and standards should be at the same temperature for precise measurement. A difference of 1 C in temperature will result in approximately a 2% error. All samples must be aqueous. Always rinse the electrode with distilled water and blot dry between measurements. Use a clean, dry tissue to prevent cross-contamination. -
Page 7: Measurement Procedure
Instruction Manual Carbon Dioxide Electrode 440.0 1,000.0 44.0 100.0 10.0 MEASUREMENT PROCEDURE Direct Measurement Direct measurement is a simple procedure for measuring a large number of samples. A single meter reading is all that is required for each sample. The ionic strength of samples and standards should be made the same by adjustment with ISA for all carbon dioxide solutions. -
Page 8: Direct Measurement Of Carbon Dioxide (Using An Ion Meter)
Instruction Manual Carbon Dioxide Electrode A calibration curve is constructed on semi-logarithmic paper when using the pH/mV meter in the millivolt mode. The measured electrode potential in mV (linear axis) is plotted against the standard concentration (log axis). In the linear region of the curve, only three standards are necessary to determine a calibration curve. -
Page 9: Electrode Characteristics
Instruction Manual Carbon Dioxide Electrode ELECTRODE CHARACTERISTICS Reproducibility Electrode measurements reproducible to ±2% can be obtained if the electrode is calibrated every hour. Factors like temperature fluctuation, drift, and noise limit reproducibility. Reproducibility is independent of concentration within the electrode's operating range. Interferences Certain volatile weak acids are potential electrode interferences. -
Page 10: Electrode Response
Instruction Manual Carbon Dioxide Electrode temperature. Table 3 gives values for the "S" factor in the Nernst equation for the carbon dioxide ion. Gases are expelled from a solution at a faster rate as the temperature increases. TABLE 3: Temperature vs. Values for the Electrode Slope Temp.( "S"... -
Page 11: Limits Of Detection
Electrode Life A carbon dioxide gas-sensing electrode will last six months in normal laboratory use. On-line measurements might shorten operational lifetime to several months. In time, the response time will increase and the calibration slope will decrease to the point calibration is difficult and membrane replacement is required. -
Page 12: Carbon Dioxide Chemistry
Instruction Manual Carbon Dioxide Electrode ] [HCO ⎯⎯⎯⎯⎯⎯⎯ = constant The bicarbonate ion level can be considered constant since the internal filling solution contains a high level of sodium bicarbonate: ] = [CO ] X constant The electrode sensing element's potential, with respect to the internal reference element, varies in a Nernstian manner with changes in the hydrogen level. -
Page 13: Electrode Application
Instruction Manual Carbon Dioxide Electrode ELECTRODE APPLICATION Carbon Dioxide Content of Wines and Carbonated Beverages Wines and carbonated beverages have a high (greater than 2X10 M or 880 ppm) carbon dioxide concentration. As a result, samples are measured after dilution. When samples are collected, they Sample Storage must be made basic immediately or CO will escape into the atmosphere (see... -
Page 14: Carbonate Content In Groundwater
Instruction Manual Carbon Dioxide Electrode Carbonate Content in Groundwater Free CO , bicarbonate, and carbonate - the total amount of carbonate - in ground water or seawater, will depend on location, temperature, depth, and pH. Using the measurement procedure in the MEASUREMENT section, the carbonate level in groundwater or seawater can be measured. -
Page 15: Troubleshooting Guide
Instruction Manual Carbon Dioxide Electrode TABLE 4: Step-wise Calibration for Measurement Step Pipet Added Volume Concentration 0.1 ml 109.9 ppm 0.9 ml 1,089 ppm 10.0 ml 10,900 ppm A = 1 ml graduated pipet; B = 10 ml volumetric pipet TROUBLESHOOTING GUIDE The goal of troubleshooting is the isolation of a problem through checking each of the system components in turn: the meter, the glassware, the electrodes, the standards, the sample, and the... -
Page 16: Standards
GENERAL PREPARATION Refer to the instruction manual again. Reread sections on ELECTRODE CHARACTERISTICS. If trouble still persists, call Eutech Instruments Pte Ltd. at (65) 6778-6876 and ask for the Customer Services Department. -
Page 17: Troubleshooting Hints
Instruction Manual Carbon Dioxide Electrode TROUBLESHOOTING HINTS Symptom Possible Causes Next Step Out of Range defective meter perform meter checkout Reading procedure (see meter instruction manual) Checking the defective inner body refer to Electrode Inner Body electrode not unplug electrode and reset plugged in properly internal filling fill outer body of electrode... - Page 18 Instruction Manual Carbon Dioxide Electrode incorrect internal filling refill outer body of electrode solution using filling solution shipped with electrode total sample level dilute sample of dissolved species above 1M electrode in sample reduce surface area-to- too long; CO loss volume ratio, slow down rate of stirring, avoid high temperatures...
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Page 19: Checking The Electrode Inner Body
Instruction Manual Carbon Dioxide Electrode "Incorrect Answer" incorrect scaling plot millivolts on the linear (but calibration of semi-log paper axis. On the log axis, be sure curve is good) concentration numbers within each decade are increasing with increasing concentration incorrect sign be sure to note sign of millivolt value correctly incorrect standards... -
Page 20: Specifications
110 mm length; 12 mm diameter; 1 m cable length Storage: Store electrodes in 0.1M NaCl ORDERING INFORMATION CODE NO. DESCRIPTION EC-CO2-01 Carbon Dioxide Gas Sensing Electrode EC-MIS-CD Carbon Dioxide Membrane Cartridge Kit, box of 3 membrane cartridges and spare o-rings EC-SCS-CO1-BT Carbon Dioxide Standard, 0.1M NaHCO EC-SCS-CO2-BT...
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