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EUTECH INSTRUMENTS EC-ISA-KO1-BT Скачать руководство пользователя страница 14

Instruction Manual

Potassium Electrode

14

Meter

The meter may be checked by following the checkout procedure in the instrument instruction
manual.

Glassware

Clean glassware is essential for good measurement. Be sure to wash the glassware well with a mild
detergent and rinse very well with distilled or deionized water. Clean glassware will drain without
leaving water droplets behind.

Electrodes

The electrodes may be checked by using the procedure found in the sections entitled

Electrode

Slope Check

.

1.

Be sure to use distilled or deionized water when following the procedures given in

Electrode Slope Check.

2.

If the electrode fails to respond as expected, see the sections

Measuring Hints

and

Electrode Response

. Repeat the slope check.

3.

If the electrode(s) still fail to respond as expected, substitute another potassium ion
electrode that is known to be in good working order for the questionable electrode. If the
problem persists and you are using an electrode pair, try the same routine with a working
reference electrode.

4.

If the problem persists, the reagent may be of poor quality, interferences in the sample may
be present or the technique may be faulty. See

Reagents, Sample

, and

Technique

sections below.

5.

If another electrode is not available for test purposes, or if the electrode in use is suspect,
review the instruction manual and be sure to:

- Clean and rinse the electrode(s) thoroughly.
- Prepare the electrode(s) properly.
- Use the proper filling solution.
- Adjust the pH and the ionic strength of the solution by the use of the proper ISA.
- Measure correctly and accurately.
- Review

TROUBLESHOOTING HINTS

.

Reagents

Whenever problems arise with the measuring procedure that has been used successfully in the past,
be sure to check the reagent solutions. If in doubt about the credibility of any of the reagents,
prepare them again. Errors may result from contamination of the ISA, incorrect dilution, poor
quality distilled/deionized water, or a simple mathematical miscalculation.

Sample

Look for possible interferences, complexing agents, or substances which could affect the response
or physically damage the sensing electrode (or the reference electrode) if the electrode(s) work
perfectly in the standard, but not in the sample. Try to determine the composition of the samples
prior to testing to eliminate a problem before it starts. See sections on

Measuring Hints, Sample

Requirements,

and

Interferences.

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Содержание EC-ISA-KO1-BT

Страница 1: ...Instruction Manual Potassium Electrode 1 EUTECH INSTRUMENTS PTE LTD INSTRUCTION MANUAL POTASSIUM ION ELECTRODE...

Страница 2: ...of Potassium using a standard pH mV meter 6 Direct Measurement of Potassium using an ion meter 7 Low Level Potassium Determination using a standard pH mV meter 8 Low Level Potassium Determination usi...

Страница 3: ...grade potassium chloride Swirl the flask gently to dissolve the solid Fill to the mark with distilled water cap and upend several times to mix the solution 3 Eutech Potassium Standard 1 000 ppm K 1 Co...

Страница 4: ...instability is observed see the TROUBLESHOOTING section 2 Using a pipet add 1 ml of 0 1M or 1 000 ppm potassium standard to the beaker When the reading is stable record the mV reading 3 Using a pipet...

Страница 5: ...perature To counteract this effect place a piece of insulating material such as styrofoam sheet or asbestos sheet between the stirrer and beaker Always rinse the electrode tip s with distilled water a...

Страница 6: ...2 10 3 and 10 4 M or 100 10 and 1 ppm standards by serial dilution of the 0 1M or 1 000 ppm standard Measure out 100 ml of each standard into individual 150 ml beakers Add 2 ml of ISA per 100 ml of st...

Страница 7: ...de tip s in the solution When the reading has stabilized record the millivolt reading Determine the concentration directly from the calibration curve 7 The electrode s should be re calibrated every 1...

Страница 8: ...meter display 12 The electrodes should be re calibrated every 1 2 hours Simply repeat Steps 2 8 2 9 above Low Level Potassium Determination using a standard pH mV meter This procedure is recommended f...

Страница 9: ...tip s into the solution 10 After the reading has stabilized record the mV reading and determine the concentration from the low level calibration curve 11 Prepare a new low level calibration curve dai...

Страница 10: ...ris hydroxymethyl aminomethane Interferences ppm 100 ppm K 1 10 ppm K 1 1 ppm K 1 Cs 1 1 0X102 1 0X101 1 0 K 1 2 7X102 2 7X101 2 7 Tl 1 3 1X103 3 1X102 3 1X101 H 1 1 6 pH 2 6 pH 3 6 pH Ag 1 2 7X105 2...

Страница 11: ...chloride solutions The upper limit of detection is above 1 0X10 1 M when other ions are present but the possibility of a liquid junction potential developing at the reference electrode and the salt e...

Страница 12: ...rained of filling solution if refillable and the rubber insert placed over the filling hole ELECTRODE THEORY Electrode Operation A potassium ion electrode consists of an electrode body containing an i...

Страница 13: ...difference between the two solutions since 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 standardiz...

Страница 14: ...es in the sample may be present or the technique may be faulty See Reagents Sample and Technique sections below 5 If another electrode is not available for test purposes or if the electrode in use is...

Страница 15: ...Reading see meter instruction manual electrode s not unplug electrode s and reset plugged in properly reference electrode be sure reference electrode is not filled filled air bubbles on remove bubble...

Страница 16: ...se recommended ISA standard used as ISA use ISA defective electrode check electrode operation electrode exposed soak electrode standard to interferences in potassium air bubble on membrane remove bubb...

Страница 17: ...ducibility 2 Samples Aqueous solutions only no organic solvents Size 110 mm length 12 mm diameter 1 m cable length Storage Electrode should be stored in dilute potassium standard ORDERING INFORMATION...

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