Determination of non-volatile residues in industrial butadiene (2)

6 Measurement procedure

6.

Note: Chromic acid has strong acidity and strong oxidizing properties, and it is easy to corrode and burn the skin and eyes.

6.

6.

Note: Butadiene is a flammable and explosive substance.

6.

Note: This measurement procedure is described in the method of weighing with balance, but the direct weighing method without balance can also be used

7 Expression of analysis results

7.

The content c of the residue in butadiene expressed in mg/kg is calculated according to formula (1):

In the formula: m ₁ -the quality of burnt pomace, g;

m ₂ —the mass of the beaker and the residue, g;

V—sample volume, mL;

p—The density of the sample at the sampling temperature (t, °C), g/mL, can be calculated as: p=0.

7.

Take the arithmetic average of the two repeated determination results as the analysis result, and round it to the accuracy of 0.

8 Precision

8.

In the same laboratory by the same operator, using the same instrument, under the same conditions, the same sample is repeated twice in succession, and the difference between the measured values ​​should not exceed 15mg/kg (95% confidence level)

8.

To be determined

9 report

The test report should include the following contents;

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

b) Code of this standard;

c) Analysis results;

d) A description of any abnormal phenomena observed during the measurement;

e) Sampling and analysis of the person's name, date of analysis
.

Related links: Determination of non-volatile residues in industrial butadiene (1)