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Summary of Contents for EUTECH INSTRUMENTS CYANIDE EPOXY
- Page 1 Instruction Manual Cyanide Electrode EUTECH INSTRUMENTS PTE LTD. INSTRUCTION MANUAL CYANIDE ION ELECTRODE...
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Page 2: Table Of Contents
Cyanide Electrode Instruction Manual TABLE OF CONTENTS GENERAL INSTRUCTIONS ......................3 Introduction ..............................3 Required Equipment..........................3 Required Solutions ...........................3 GENERAL PREPARATION......................4 Electrode Preparation ..........................4 Electrode Slope Check (with pH/mV meter) ...................4 Electrode Slope Check (with an ion meter)....................4 MEASUREMENT..........................5 Measuring Hints ............................5 Sample Requirements..........................5 Units of Measurement ..........................6... -
Page 3: General Instructions
CYANIDE ION ELECTRODE INSTRUCTION MANUAL GENERAL INSTRUCTIONS Introduction Eutech Instruments Cyanide Ion Electrode is used to measure cyanide ions in aqueous solutions quickly, simply, accurately, and economically. *IMPORTANT NOTICE* Acidic cyanide solutions produce hydrogen cyanide (HCN) gas, highly toxic whether breathed or absorbed through the skin. -
Page 4: General Preparation
Cyanide Electrode Instruction Manual Cyanide Standard, 1X10 M. To prepare this solution from your own laboratory stock, add 10 ml of ISA and about 500 ml of distilled water to a one liter volumetric flask. Add 0.49 grams of dry, reagent-grade sodium cyanide, NaCN, to the solution and swirl the flask gently to dissolve the solid. -
Page 5: Measurement
Instruction Manual Cyanide Electrode Prepare standard cyanide solutions whose concentrations vary by tenfold. Use either the 1.0X10 M or the 1,000 ppm cyanide standard. Use the serial dilution method for this preparation. To a 150 ml beaker, add 100 ml of the lower value standard and 1 ml of ISA. Place the beaker on a magnetic stirrer and begin stirring at a constant rate. -
Page 6: Units Of Measurement
Infrequent measurements in solutions containing methanol, benzene, or acetonitrile are permitted. Highly polar solvents slowly attack the epoxy body electrode. Please check with Eutech Instruments Pte Ltd. before using the electrode in other solvents. -
Page 7: Direct Measurement Of Cyanide (Using An Ion Meter)
Instruction Manual Cyanide Electrode NaOH (ISA). After assuring that the meter is in the mV mode, lower the electrode tips into the solution. After the reading has stabilized, record the mV reading. Place 100 ml of the mid-range solution in a 150 ml plastic beaker. Place the beaker on the magnetic stirrer and begin stirring at a constant rate. -
Page 8: Low-Level Cyanide Measurements (Using A Ph/Mv Meter)
Cyanide Electrode Instruction Manual For low level measurements (below 8X10 M or 0.2 ppm), place the rinsed, dried electrodes into a solution containing 100 ml of distilled water and 1 ml ISA. After stabilization, fix the blank value in the meter according to the meter manufacturer's instruction. -
Page 9: Electrode Characteristics
Instruction Manual Cyanide Electrode On a semi-logarithmic paper, plot the concentration (log axis) against the millivolt reading (linear axis) as in Figure 1. Reserve the final solution for checking the electrode each hour. To a 150 ml plastic beaker, add 100 ml of sample and 1 ml of ISA. Place the beaker on the magnetic stirrer and begin stirring at a constant rate. -
Page 10: Complexation
Cyanide Electrode Instruction Manual Using Table 3, the maximum ratio is: ———— = 5X10 [CN -1 ] ] = 5X10 = (5X10 ) (1X10 ] = 5X10 M = maximum bromide concentration for no interference Complexation Total concentration, Ct, consists of free ions, Cf, and complexed or bound ions, Cc, in solutions: Ct = Cf + Cc Since the electrode only responds to free ions, any complexing agent in the solution reduces the measured concentration of ions. -
Page 11: Electrode Response
Instruction Manual Cyanide Electrode TABLE 4: Temperature vs. Values for the Electrode Slope Temp.( "S" 54.20 56.18 58.17 59.16 60.15 62.13 64.11 If changes in temperature occur, the electrodes should be re-calibrated. The temperature range for the cyanide electrode is 0 C, provided that temperature equilibrium has occurred. -
Page 12: Limits Of Detection
Cyanide Electrode Instruction Manual Limits of Detection Cyanide levels from 5X10 M to 1X10 M cyanide can be measured with the cyanide electrodes. However, since cyanide ion attacks the electrode membrane, measurements above 1X10 M should be done only intermittently. The electrodes respond to cyanide in the sample as well as to ions dissolved from the membrane at low levels. -
Page 13: Electrode Operation
Instruction Manual Cyanide Electrode Electrode Operation Eutech Cyanide Ion Electrodes consist of a solid membrane containing a mixture of inorganic silver compounds bonded into the tip of a glass or epoxy electrode body. An electrode potential develops across the membrane when the electrode is in contact with solution containing cyanide ions and is capable of measuring free cyanide ions. -
Page 14: Troubleshooting Guide
Cyanide Electrode Instruction Manual ions diffuse at different rates. When making measurements, it is important to remember that this potential be the same when the reference is in the standardizing solution as well as in the sample solution or the change in liquid junction potential will appear as an error in the measured electrode potential. -
Page 15: Standards And Reagents
GENERAL PREPARATION ELECTRODE Refer to the instruction manual again. Reread sections CHARACTERISTICS. If trouble still persists, call Eutech Instruments Pte Ltd. at (65) 6778-6876 and ask for the Customer Services Department. -
Page 16: Troubleshooting Hints
Cyanide Electrode Instruction Manual TROUBLESHOOTING HINTS Symptom Possible Causes Next Step Out of Range defective meter check meter with shorting Reading strap (see meter instruction manual) defective electrode check electrode operation electrodes not unplug electrodes and reset plugged in properly reference electrode be sure reference electrode not filled... - Page 17 Instruction Manual Cyanide Electrode Low Slope or standards contaminated prepare fresh standards No Slope or incorrectly made ISA not used use recommended ISA standard used as ISA use ISA electrode exposed check section entitled Complexation to complexing agents air bubble on membrane remove bubble by re-dipping probe "Incorrect Answer"...
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Page 18: Specifications
Cyanide Electrode Instruction Manual SPECIFICATIONS Concentration Range: 1X10 M to 5X10 260 to 0.1 ppm pH Range: 11-13 Temperature Range: Resistance: <1 Mohms Reproducibility: ±2% Size: 110 mm length; 12 mm diameter; 1 m cable length Storage: store in cyanide standard with ISA added ORDERING INFORMATION CODE NO.
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