Industrial Acrylonitrile—Determination of Iron and Copper Content Spectrophotometric Method (4)

8 Expression of analysis results

8.

The iron or copper content w, the value is expressed in mg/kg, calculated according to formula (1):

Where:

m——The value of iron or copper content found on the standard curve, in micrograms (ug);

V——The value of the volume of the sample, the unit is milliliters (mL);

P——The value of the density of the sample, in grams per milliliter (g/mL)

8.

Take the arithmetic average of the two repeated determination results as the analysis result, and the value shall be rounded according to the provisions of GB/T8170 to the nearest 0.

9 Repeatability

In the same laboratory, the absolute value of the two independent test results obtained by the same operator using the same equipment, using the same test method, and testing the same object under test independently in a short period of time should not exceed the following repeatability Limit (r) [provided that the repeatability limit (r) does not exceed 5%]:

Iron is not more than 40% of its average value;

Copper is not more than 30% of its average value

10 reports

The report should include the following:

a) All information about the sample.

b) Number of this part:

c) Analysis results;

d) Details and descriptions of any abnormal phenomena observed during the measurement;

e) the name of the analyst and analysis date