Industrial acrylonitrile. Determination of total cyanide content. Titrimetric method (2)

7 Analysis steps

7.

7.

8 Expression of analysis results

8.

The total cyanide content X expressed in mass percentage (in terms of hydrocyanic acid ) is calculated as follows:

In the formula: V ₁ -the volume of the silver nitrate standard titration solution consumed by the reagent blank, mL;

V ₂ —The volume of the silver nitrate standard titration solution consumed by the titration sample, mL;

c—The concentration of the substance in the silver nitrate standard titration solution, mol/L;

V—sample volume, mL;

p—sample density, g/mL;

0.

8.

Take the arithmetic average of the two repeated determination results as the analysis result, and the difference between the two repeated determination results should meet the requirements of Chapter 9 Precision

9 Precision

9.

In the same laboratory, the same operator uses the same instrument, under the same operating conditions, using normal and correct operating methods to perform two repeated measurements on the same sample, and the difference between the measured values ​​should not exceed 10 of the average value.

10 report

The report should include the following:

a.

b.

c.

d.

e.

Related links: Titration method for determination of total cyanide content in acrylonitrile for industrial use (1)