Determination method for OCPs in environmental sample
A technology of environmental samples and determination methods, which is applied in the field of detection of OCPs, can solve problems such as the inability to accurately determine the content of OCPs in environmental samples, and achieve the effects of improving accuracy and sensitivity, improving recovery rate and accuracy, and reducing the degree of decomposition
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[0043] An embodiment of the present invention provides a method for determining OCPs in a soil or sediment sample, comprising the following steps:
[0044] Sample extraction steps: Weigh about 10g of ordinary soil or sediment as the sample to be tested, add 13C-OCPs to purify the internal standard, and use 300mL toluene and acetone (9:1, V / V) mixed solvent Soxhlet extraction for 16-24h to obtain Extraction solution;
[0045] TBA-Sulfite sulfur removal: Concentrate the extract to 10mL, add 10mL tetrabutylammonium sulfite aqueous solution and 10mL isopropanol, shake for 1min, if there is no precipitation (sodium sulfite crystal) in the lower layer solution, add a small amount of sodium sulfite solid powder , until there will be solid residues after repeated shaking, discard the solid residues in the lower layer and keep the organic phase, wash the organic phase with water, remove water with anhydrous sodium sulfate, and wait for the next step of purification;
[0046] Florisil ...
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