Abstract
The invention discloses a sample pretreatment and quantitative analysis method for linear alkylbenzene in soil / sediment. The sample pretreatment comprises the following steps: S1, taking to-be-detected soil / sediment, wrapping the to-be-detected soil / sediment with a glass fiber filter membrane, and putting the wrapped to-be-detected soil / sediment into a sleeve of an automatic soxhlet extractor; S2,adding a dichloromethane solvent into a measuring cup of an automatic Soxhlet extractor, boiling for 60 minutes, leaching for 60 minutes, recovering the solvent for 10 minutes, finishing extraction,collecting an extracting solution, removing water, and concentrating, wherein the mass volume ratio of the to-be-detected soil / sediment to dichloromethane is 10g: 80mL; and S3, concentrating the extracting solution, exchanging a solvent, fixing the volume to 1mL, purifying the concentrated extracting solution by virtue of a chromatographic column, filling the purifying column with 3.0 g of silicagel, leaching the chromatographic column by virtue of 25mL of normal hexane, collecting leacheate, concentrating, fixing the volume to 1.0 mL, and performing subsequent quantitative analysis. The invention establishes an automatic Soxhlet extraction-silica gel purification-gas chromatography-mass spectrometry quantitative method which can be used for quantitative analysis of LABs in soil. Comparedwith the previously reported analysis method, the method is simple and easy to operate, saves the solvent, and is suitable for batch soil sample analysis in actual analysis and detection.
Description
technical field
[0001] The invention relates to the technical field of detection of environmental molecular markers, and more specifically, to a method for pretreatment and quantitative analysis of linear alkylbenzenes in soil / sediment. Background technique
[0002] LABs are alkane derivatives in which one hydrogen atom on the carbon chain of n-alkanes containing 10 to 14 carbons is substituted by a phenyl group. The different positions of the phenyl substitution form a series of homologues, collectively referred to as linear alkylbenzenes, which are mainly used for industrial synthesis of long chains. Paraffin Sulfonate (LAS) - A major ingredient in anionic detergents that has been widely used since the 1960's. Since there will be a small amount of LABs left in LAS-type detergents during the synthesis process, LABs will enter the environment with the use and subsequent disposal of this type of detergent in daily life, and are usually used as molecular markers for domestic s...
