Solid waste. Determination of volatile halogenated hydrocarbons. 35 VOCs purge and trap/gas chromatography-mass spectrometry (3)

7.

(1) Qualitative target compound

Qualitatively based on the retention time of each component of the standard substance and comparison with the standard mass spectrum

(2) Use the average relative response factor to establish a calibration curve

The relative response factor RRF _i of the target (or substitute) in the ith point of the standard series is calculated according to formula (1)

In the formula, A _i -the response value of the quantification ion of the ith target (or substitute) in the standard series;

A _ISi —the response value of the internal standard quantitative ion corresponding to the i-th target (or substitute) in the standard series;

p _IS —the mass concentration of the internal standard in the standard series;

P _{i —the} mass concentration of the target substance (or substitute) at the i-th point in the standard series

The average relative response factor of the daily standard (or substitute) is calculated according to formula (2)

(2) where n—the number of standard series points

(3) Calculation of the mass concentration of the Japanese standard substance (or substitute) in the sample

When the target (or substitute) is calibrated with an average response factor, the mass concentration p _ex (ug/L) of the target (or substitute) in the sample is calculated according to formula (3)

In the formula, A _x -the response value of the target (or substitute) quantitative ion;

A _IS —The response value of the internal standard quantification ion corresponding to the target (or substitute);

P _{the IS} - the concentration of the internal standard, UG / L;

8.

(1) At least one transportation blank and full procedure blank should be collected for each batch of samples

(2) Before the analysis of each batch of samples or within 24 hours, it is necessary to check the performance of the instrument, measure the calibration confirmation standard sample ( 4-fluorobenzene ) and the blank sample

(3) The configuration of the standard series should be at least 5 points, and the configuration mass concentration range should cover the mass concentration of the sample to be tested

(4) Each batch of samples should be subjected to parallel analysis and matrix spike analysis

Nine, matters needing attention

(1) Low-temperature baking, dilute hydrochloric acid soaking, etc.