Industrial Acrylonitrile—Determination of Copper Content Graphite Furnace Atomic Absorption Method (2)

7 Analysis steps

7.

According to the operating instructions of the instrument: install and age the graphite tube in the atomic absorption spectrometer

Table 1 Recommended working conditions of atomic absorption spectrometer

7.

7.

7.

7.

Note 1: If the instrument is not equipped with the online dilution function, you can also manually prepare the series of standard solutions required by the standard curve from the 1ug/mL copper standard solution (7.

7.

7.

Note 2: If the steel content in the sample solution exceeds 400 ng/mL, the dilution ratio of the sample can be increased

7.

7.

8 Expression of analysis results

8.

The copper content w in the sample is calculated in milligrams per kilogram (mg/kg), calculated according to formula (1):

Where:

p _cu —The measured copper content of the sample solution after dilution, in nanograms per milliliter (ng/mL);

P—The density of the acrylonitrile sample during the measurement, in grams per milliliter (g/mL);

n— The dilution factor of the acrylonitrile sample diluted with ethanol

8.

8.
2.
1 The value of the analysis result shall be rounded according to GB/T8170, and the arithmetic average of the two repeated determination results shall be taken to represent the analysis result
.

8.
2.
2 The report of copper content in acrylonitrile shall be accurate to 0.
001mg/kg
.

9 Repeatability

In the same laboratory, the same operator uses the same equipment, uses the same test method, and performs independent tests on the same object in a short period of time.
The absolute difference between the two independent test results obtained is not more than 10 of the average value.
%, on the premise that it does not exceed 5% if it is greater than 10% of its average value
.

10 Test report

The test report should include the following:

a) All information about the sample, such as sample name, batch number, sampling location, sampling date, sampling time, etc.
;

b) Number of this part;

c) Analysis results;

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

e) the name of the analyst and analysis date
.