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Fang L.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Feng Y.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Liu H.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Wu Z.,Institute for Environmental Reference Materials of Ministry of Environmental Protection
Chinese Journal of Chromatography (Se Pu) | Year: 2010

A method was developed for the determination of organochlorine pesticide (OCP) residues in soil/sediment using high resolution gas chromatography coupled with low resolution mass spectrometry. The analytical procedures consisted of Soxhlet extraction; sulfur removal with copper powder, clean-up with gel permeation chromatography (GPC) and a florisil column of solid phase extraction (SPE). The analytes were separated on an HP-5MS capillary column, detected in selected ion monitoring (SIM) mode and quantified using internal standard calibration curves of isotope dilution technique. The linear correlations of calibration standard solutions were good for all the OCPs. The recoveries and relative standard deviations of labeled compound solutions ranged from 60% to 110% and from 1. 5% to 18%, respectively. The limits of detection ranged from 0. 20 to 10. 3 μg/kg were established for the 23 OCPs. The method showed satisfactory clean-up effect and precision quantification. It is suitable for the determination and confirmation of pesticides in complex matrices such as soil, sediment. Source


Li N.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Guo J.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Fan Q.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Wang S.-B.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | And 2 more authors.
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2013

The development method of a chlorobenzene gas standard are described. Chlorobenzene gas standard is prepared by gravimetric method and is intercompared to the existing gas cylinder standards using gas chromatography with a hydrogen flame ionization detector. The linear regression analysis show excellent agreement among the standards for chlorobenzene. As a result of with-in homogeneity, the data show that chlorobenzen are homogeneous in the cylinder, the long-term stability of the gas standard is as long as 12 months. The certified value of developed chlorobenzene gas standard is 1~5 μmol/mol, and the relative expanded uncertainty is 5% at the 95% confidence interval for chorobenzene, it agree with the similar standard gas from Scott Specialty Gases. Source


Li N.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Wang Q.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Guo J.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Wang S.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | And 2 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2010

A method for the preparation of the standard gas mixture of 6 chlorinated hydrocarbons; containing dichloromethane, 1, 1 -dichloroethane, 1, 2-dichloroethane, chloroform; 1, 1, 1 -trichloroethane, and 1, 1, 2-trichloroethane, at the concentration of 5 μmol/mol in nitrogen was developed. The reproducibility of this method and the homogeneity and long-term stability of the standard mixture were evaluated. The results showed that all 6 chlorinated hydrocarbons have shown stability as long as 12 months and the expanded relative uncertainty of 5%. The certified value of developed standard gas agreed with the similar standard gas from Scott Specialty Gases. This research established a foundation for the analysis of volatile chlorinated hydrocarbon gases. Source


Cao D.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Tian W.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Feng Y.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | Liu H.,Institute for Environmental Reference Materials of Ministry of Environmental Protection | And 2 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2010

The preparation method of new soil candidate certified reference materials ( CRM) for the analysis of organochlorine pesticides in soils has been developed. The soil sample was dried; ground; homogenized and packed. After Soxhlet extraction and Florisil purification; the organochlorine pesticides in soil candidate were further determined using gas chromatography-mass spectrometry. The results showed that the soil collected from Shenyang was an ideal soil candidate material for organochlorine pesticide analysis. This method established a foundation for the development of soil reference materials for the analysis of organochlorine pesticides. Source

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