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串联四极杆质谱(GC-QqQ-MS/MS)测定土壤中的有机氯农药和多氯联苯 总被引:6,自引:1,他引:5
建立了用加速溶剂萃取仪(ASE)萃取、凝胶渗透色谱(GPC)净化、气相色谱/串联四极杆质谱多反应监测、同时测定土壤中17种有机氯农药和19种多氯联苯的方法.加标浓度在3.3μg/kg时的平均回收率在79.6%~93.2%之间,相对标准偏差在2.9%~13.0%之间,定量限在0.01~0.51μg/kg之间.在检测土壤样品中的有机氯农药和多氯联苯残留方面,Gc-QqQ-MS/MS相对于气相色谱/电子捕获检测器(GC-ECD)和GC-MS的选择离子检测(SIM)模式具有非常明显的优势,尤其是在低浓度水平的定性和定量方面. 相似文献
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Residues of organochlorine pesticides in water and suspended particulate matter from the Yangtze River catchment of Wuhan, China 总被引:6,自引:0,他引:6
The residues of 13 organochlorine pesticides (OCPs) in surface water and HCHs and DDTs in suspended particulate matter (SPM)
from rivers and lakes in Yangtze River catchment of Wuhan, China, were investigated. The concentration of total OCPs in surface
water varied from 1.01 to 46.49 ng l−1 (mean 10.55 ng l−1). The levels of total HCHs (ΣHCH) and total DDTs (ΣDDT) in surface water were in the range of 0.55–28.07 ng l−1 and lower than detection limit to 16.71 ng l−1, respectively, which was lower than Chinese standards on the whole. For OCPs residues in SPM, the mean levels varying from
0.20 to 34.72 ng l−1 and 0.46 to 2.72 ng l−1 for ΣHCH and ΣDDT, respectively, which ranked the relatively higher levels among Chinese studied rivers. Results from this
investigation showed that previous excessive usage of technical OCPs was the main reason for the residues of HCHs and DDTs
both in surface water and SPM, although some new sources were likely to occurred in the region. Apart from the OCPs in SPM
originated from upstream in flood season, one of the important sources of OCP residues both in water and SPM in Yangtze River
was supposed to be the inputs of its tributaries. Additionally, in situ water-SPM phase distributions of OCPs indicated that
HCHs tended totransport with water as well as DDTs was prone to combine with SPM in Yangtze River catchment of Wuhan. 相似文献
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Determination and Assessment of HCHs and DDTs Residues in Sediments from Lake Dongting, China 总被引:5,自引:0,他引:5
The contamination of organochlorine pesticides hexachlorocyclohexane (HCH) and Dichlorodiphenyltrichloroethane (DDT) and their
eco-environmental assessment in surface sediments from Lake Dongting, the second-largest freshwater lake in China, were studied.
Concentrations of ∑HCH (=α-HCH + β-HCH + γ-HCH +δ-HCH) were 0.21--9.59 ng/g dry weight and those of ∑ DDT = p,p'-DDD+p,p'-DDE+o,p'-DDT+p,p'-DDT)
ranged from under detectable limit to 10.15 ng/g dry weight. The ratios of α-HCH to γ-HCH were above 7 at most sampling sites
while no or a small amount of β-HCH were found at all sites, suggesting the degradation of HCH used in the history and possibly
current use of HCH in the region. The low ratios (below 2.0 in most cases) of (p,p'-DDE+p,p'-DDD) to p,p'-DDT and high levels
of individual isomers of DDT at some sites also suggested that there have still been fresh inputs of DDT into Lake Dongting.
Through the comparison between concentrations of HCH and DDT residues in sediments of Lake Dongting and those from other places
in China and also from the results of our eco-environmental assessment, it can be concluded that Lake Dongting is the water
body with high contamination of both HCH and DDT in its sediments in comparison with other water bodies in China. 相似文献
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气相色谱法同时分析测定土壤中15种有机氯农药残留 总被引:4,自引:1,他引:3
采用石油醚+丙酮(3+1,V/V)作为提取溶剂、硫酸钠溶液与弗罗里藻土净化,气相色谱法同时测定贵州150个土壤背景点15种有机氯农药残留.峰面积与保留时间的精密度分别为1.14~5.15,0.01~0.09;线性关系均在0.99以上;加标回收率为84.3%~127.8%;方法检出限为0.003~0.025ng/g.该方法适用于土壤背景点有机氯农药残留量的分析. 相似文献
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Levels and source of organochlorine pesticides in surface waters of Qiantang River, China 总被引:3,自引:0,他引:3
Qiantang River is a typical river used for drinking water source, flowing through agricultural area in east China. Surface
water samples at 45 sampling sites from the river were collected and analyzed for 13 organochlorine pesticides (OCPs) during
six surveys in 2 years of 2005–2006. Sediments, soils, farmland runoff water and dry/wet deposition of this region were also
measured for their OCPs residue in order to know possible source of OCPs contamination. The total OCPs concentrations in surface
water were 7.68–615.2 ng/l. β-HCH, δ-HCH, Aldrin, Heptachlor, Heptachlor epoxide are the major OCPs in water. The maximum
levels of OCPs in water were found in July, while significantly lower OCP concentrations were measured in January. Significant
linear correlation was found between the concentration of HCH and that of total 13 OCPs in water. The measured OCP concentrations
in sediments, soils, farmland runoff water and dry/wet deposition are discussed in relation to concentrations and patterns
found in the surface water. Comparison of OCP levels in sediments and soils led to conclusion that erosion of soil contribute
significantly to the contamination of water. The OCPs dry and wet deposition to water body was estimated to 0.49 and 0.86 ton/year,
respectively. The ratio of α/γ-HCH and (DDE+DDD)/∑DDT in environmental matrix indicated there probably existed new OCPs input
of lindane and dicofol into the river. 相似文献