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Huang N.,Guangxi Province Environmental Monitoring Center | Tian Y.,Guangxi Province Environmental Monitoring Center | Liang L.-L.,Guangxi Province Environmental Monitoring Center
Xiandai Huagong/Modern Chemical Industry | Year: 2014

A method for the analysis of picric acid in surface water was developed by liquid chromatography-tandem mass spectrometry. Water samples were filtered in the field through 0.2 μm nylon syringe filters, decuple diluted with pure water, and a 5 μL injection. The method's working curve of correlation coefficient was 0.999 4, the average recoveries ranged from 79.6% to 98.0%, the relative standard derivations were in the range of 1.9% to 3.1%, and the detection limit was 0.02 μg/L, the method was suitable for the monitoring of picric acid in surface water.

Xu G.,Guangxi Province Environmental Monitoring Center | Ou X.,Guangxi Province Environmental Monitoring Center | Liang L.,Guangxi Province Environmental Monitoring Center | Qin X.,Guangxi Province Environmental Monitoring Center
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010

A method for sample pretreatment of organochlorine pesticides in soil by accelerated solvent extraction (ASE), with two-stage extraction temperature, prior to gas chromatography was developed. The samples were extracted with a mixture of n-hexane and acetone (1:1, V:V) and the extracts were cleaned up on a Florisil solid phase extraction (SPE) cartridge and desulfurized with copper powder. The analyses were separated on a HP-5MS capillary column and detected with an electron capture detector. Validation of the technique was performed using standard reference materials. Recoveries for these matrices were good (78.5%~117.9%) with all RSD less than 10.7%. The method also was applied to real samples, and good linearity was obtained for 8 compounds with detection limits ranging from 0.05 μg · kg-1 to 0.20 μg · kg-1. Recoveries in spiked soil samples were 74.9%~124.8% with RSD of 3.1%~8.8%.

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