Related Manuals for EUTECH INSTRUMENTS IODIDE EPOXY
Summary of Contents for EUTECH INSTRUMENTS IODIDE EPOXY
- Page 1 Instruction Manual Iodide Electrode EUTECH INSTRUMENTS PTE LTD. INSTRUCTION MANUAL IODIDE ION ELECTRODE...
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Page 2: Table Of Contents
Instruction Manual Iodide Electrode TABLE OF CONTENTS GENERAL INSTRUCTIONS ......................3 Introduction ..............................3 Required Equipment..........................3 Required Solutions ...........................3 GENERAL PREPARATION......................4 Electrode Preparation ..........................4 Electrode Slope Check (with a pH/mV meter)..................4 Electrode Slope Check (with an ion meter)....................4 MEASUREMENT..........................5 Measuring Hints ............................5 Sample Requirements..........................5 Units of Measurement ..........................5... -
Page 3: General Instructions
IODIDE ION ELECTRODE INSTRUCTION MANUAL GENERAL INSTRUCTIONS Introduction Eutech Instruments Iodide Ion Electrode is used to quickly, simply, accurately, and economically measure free iodide ion in aqueous solutions. Required Equipment A pH/mV meter or an ion meter, either line operated or portable. -
Page 4: General Preparation
Instruction Manual Iodide Electrode GENERAL PREPARATION Electrode Preparation Remove the rubber caps covering the electrode tips and the rubber insert covering the filling hole of the combination electrode or of the reference electrode. Fill the reference electrode or the combination electrode with the filling solution shipped with the electrode to a level just below the fill hole. -
Page 5: Measurement
Infrequent measurements in solutions containing methanol, benzene, or acetonitrile are permitted. Highly polar solvents slowly attack the electrode. Please check with Eutech Instruments Pte Ltd. before using these electrodes in other organic solvents. -
Page 6: Measurement Procedure
Instruction Manual Iodide Electrode Iodide ions can be measured in units of moles/liter, parts/million, or any other convenient concentration unit. Table 1 indicates some of the concentration units. TABLE 1: Concentration Unit Conversion Factors moles/liter ppm I 1.0X10 12.7 1.0X10 127.0 1.0X10 1,270.0... -
Page 7: Direct Measurement Of Iodide (Using An Ion Meter)
Instruction Manual Iodide Electrode A calibration curve is constructed on semi-logarithmic paper when using a 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 8: Low Level Iodide Determinations (Using A Ph/Mv Meter)
Instruction Manual Iodide Electrode Place the more concentrated solution on the magnetic stirrer and begin stirring at a constant rate. Lower the electrode tips into the solution. Adjust the meter to the concentration of the standard and fix the value in the memory according to the meter manufacturer's instructions after stabilization of the reading. -
Page 9: Complexation
Instruction Manual Iodide Electrode TABLE 2: Maximum Allowable Ratio of Interfering Ion to Iodide Ion Interference Maximum Ratio 1.0X10 1.0X10 5.0X10 4.0X10 1.0X10 (1) Gran's plot titration can be used to measure mixed halides in solution. (2) These substances represent complexing species whose maximum level can be exceeded without electrode damage. -
Page 10: Temperature Influences
Instruction Manual Iodide Electrode Temperature Influences Samples and standards should be at the same temperature since electrode potentials are influenced by changes in temperature. A 1 C difference in temperature results in a 2% error at the 1.0X10 concentration level. Because of solubility equilibrium on which the electrode depends, the absolute potential of the reference electrode changes slowly with the temperature. -
Page 11: Limits Of Detection
Instruction Manual Iodide Electrode A drifting potential reading or a decrease in electrode slope may mean that the electrode membrane needs polishing. To polish the membrane: If using polishing paper, cut off a 1-2" piece and place it face up on the lab bench. Put a few drops of distilled or deionized water in the center of the paper. -
Page 12: Electrode Storage
Instruction Manual Iodide Electrode Electrode Storage The iodide ion electrode may be stored for short periods of time in 1.0x10 M iodide solution. For longer storage (longer than two weeks), rinse and dry the sensing pellet and cover the membrane tip with any protective cap shipped with the electrode. -
Page 13: Troubleshooting Guide
Instruction Manual Iodide Electrode The reference electrode must also be considered. When two solutions of different composition are brought into contact with one another, liquid junction potentials arise. Millivolt potentials occur from the inter-diffusion of ions in the two solutions. Electrode charge will be carried unequally across the solution boundary resulting in a potential difference between the two solutions, since ions diffuse at different rates. -
Page 14: Standards And Reagents
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 15: Troubleshooting Hints
Instruction Manual Iodide Electrode TROUBLESHOOTING HINTS Symptom Possible Causes Next Step Out of Range defective meter check meter with shorting strap Reading (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 16 Instruction Manual Iodide Electrode 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" incorrect scaling plot millivolts on the linear axis. (but calibration of semi-log paper On the log axis, be sure that curve is good)
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Page 17: Specifications
Instruction Manual Iodide Electrode SPECIFICATIONS Concentration Range: 1M to 1.0X10 127,000 ppm to 0.4 ppm pH Range: 0-14 Temperature Range: 0° to 80°C Resistance: <1 Mohm Reproducibility: ±2% Samples: Aqueous solutions only; avoid organic solvents Size: 110 mm in length; 12 mm in diameter; 1 m cable length Storage: Store in iodide solution ORDERING INFORMATION...
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