YSI TruLine Potassium Electrode Handleiding

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Required Equipment

• Ion meter or pH/mV meter.

•Wash bottle with distilled or deionized water.

• Several clean beakers.

•1 mL, 10 mL and 100 mL pipettes.

Required Solutions

• Reference Fill SolutionYSI #400429

•1000 ppm Potassium StandardYSI #400432

•100 ppm Potassium StandardYSI #400431

•r Ionic Strength Adjusto(ISA) YSI #400430

Overview

The YSI 400427 Potassium Ion Selective Electrode is a

combination electrode (includes both reference and sensing

half cells in one body housing) for measuring potassium ion

(K

+

) a ctivity in aqueous samples.

•Technology: Replaceable Polymer/PVC Membrane

(Replacement 428)Potassium Sensor Module YSI #400

• Size and material:

Body (Epoxy)12 mm OD x 155mm L —

Cap (ABS) — 16 mm OD x 57mm L

Cable (Coax type) – 100cm

BNC Connector

• D-Reference:oublejunction, Ag/AgCl, ceramic pin junction,

refillable, sodium chloride electrolyte

• Features: Replaceable Sensor Modules

•04- Range: 0.39,000 mg/L

• ±4% Reproducibility:

• 9 Slope: 54to 5mv/decade @ 25°C typical

• 2-12 pH range:

• 40°C Operating Temperature:0 to

•Interferences:

Cs

+

, NH

4

+

, Tl

+

, H

+

, Ag

+

,Tris

+

, Na

+

, Li

+

others

• Applications/Notes:Very popular for agriculture,

food/beverage, environmental, industrial

Electrode Preparation

1. This electrode performs better when the reference

junction is kept wetted during transit and storage.

However the sensor module is best stored and

transported dry. Therefore, the electrode is shipped with

a Module Blank that must be removed prior to use.

Unscrew the cap of the storage solution bottle (Soaker

Bottle) and remove the electrode. Unscrew the Module

Blank and replace it with a sensor module prior to use.

The Module Blank can be retained for long term storage.

Caution: Do not touch the PVC sensor membrane

with your fingers.

2.nce - Filling the electrode with electrolytethe refere

(outer) chamber must be filled with Reference Fill

Solution and remain open during testing:

a) Slide the sleeve of the electrode FastFil cap down to

uncover the fill hole. (see fig. 1)

b) Shake the electrode downward like a thermometer to

remove any air bubbles trapped inside.

c) The surface of the Reference Fill Solution in the

reference chamber must be above the inner junction.

This is approximately 3" from the electrode tip.

3. Rinse the electrode with Dl water, blot dry. Do not rub

dry.

4. Soak the electrode in Dlwater for 10 minutes, then in a

diluted Potassium SStandard olution for two hours prior to

calibration or use.

Electrode Diagram (fig. 1)

Checking Electrode Operation (Slope)

1. Connect the electrode to the meterPlace 100 mL Dl water .

into a 150 mL beaker. Add 2 mL Potassium ISA to the Dl

water and stir thoroughly.

2. Set the function switch to the mV mode.

3. Rinse the electrode with Dl water, blot dry and place in the

solution prepared in step 2.

4. Pipet 1 mL of 1000 ppm Potassium Standard into the

beaker. Stir thoroughly, then record the potential (

E

1

)in mV

when a stable reading is displayed.

5. Pipette 10 mL of the same standard into the same beaker.

Stir thoroughly. When a stable reading is displayed, record

the potential (E

2

) in mV.

6. The difference between the first and the second potential

readings (E

2

-E

1

) is defined as the electrode slope. The

normal range for the slope is 56±4 mV at 25°C.

Troubleshooting

If the electrode slope is not within the normal range, the

following procedure may restore the electrode.

1. Soak the electrode in a diluted standard solution for 2

hours before use.

2. Repeat "Checking Electrode Operation" procedure again.

Note: All standard solutions should be prepared fresh. For

best performance use ISA in all solutions.

Periodically check the Reference Fill Solution level in the

reference chamber of the . The solution level must be electrode

higher than the inner junction which is visible as a white

ceramic pin on the inner body.

If the electrode slope is still outside the normal range after this

procedure, you must replace the sensing module.

Reading a Sample with the Electrode

Various procedures may be used to determine the

concentration of a sample. The most common is the Direct

Calibration method, which is described below. Contact YSI’s

technical service department for details of other methods.

In Direct Calibration a series of standard solutions of differing

concentrations are used to calibrate the electrode. Then each

sample requires only a single meter reading, which is

compared with the calibration readings to obtain the sample

concentration. ISA is added to all solutions to ensure the

samples and the standards have the same ionic strength.

Set up:

1. Prepare the electrode as described in "Electrode

Preparation" and "Checking Electrode Operation". Connect

the electrode to the meter.

2. Prepare two standard solutions that differ in concentration

by a factor of ten and bracket the expected sample

concentration range. For example, if your expected sample

concentration is , you 50 mg/LPotassium should use a 10

mg/L low Standard Solution and a 10mg/L high Standard 0

Solution.

Product specificaties