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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
.