Determination of pH, Conductivity Detector and Coulomb efficiency of Electrophoresis

1. pH measurement

1. Determination of pH test paper

Use wide pH test paper with pH 1~12 or precision pH test paper with pH 8~10, first wet one end of the test paper with steamed water, then immediately immerse in the electrophoretic solution, take it out and observe the surface of the dry and wet interface of the test paper, and determine the pH value according to the pH value Color Chart. This method can be used for rough determination of pH value.

2. Determination of acidity meter

(1) Instruments and materials.

Acidity meter pHs_ 2 type

Glass beaker 50mL

Thermometer 0~50℃

Steaming water Conductivity≤5x10-4s/m

Standard buffer solution pH=9.20 is used to determine the anode electrophoresis solution

pH=4.00 or 6.86 is used to determine cathodic electrophoretic fluid

(2) Operation steps: measure according to the instrument manual

2. Conductivity measurement

1. Instruments and Materials

(1) Conductivity meter

Glass beaker 50~ 100mL

Thermometer 0~50℃

Steam house water Conductivity ≤5 x10-4s/m

2. Operation steps

 Measure according to the instrument manual.

3. Determination of Coulombic Efficiency

1. Instruments and materials

Coulomb counter

Test plate (500x120) mm, a=1mm steel plate                             

Analytical balance with a sense of 0.001g                                        

2. Operation steps

Follow the operating instructions of the coulometer.

3. Result calculation

The test results take the average value of three parallel experiments, and the relative error of each test result should not exceed 3%, otherwise the measurement should be repeated.