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液相飞行时间质谱(LC/MSD TOF)和液相色谱/离子阱质谱(LC/MSD Trap)测定色拉蔬菜中的氯烟碱类杀虫剂 总被引:1,自引:0,他引:1
ImmaFerrer EMichaelThurman JerryZwelgenbaum 《环境化学》2005,24(3):349-354
本工作考察了液相色谱/飞行时间质谱检测器(LC/MSDTOF)和液相/离子阱质谱检测器(LC/MSD Trap)联用技术分析一些氯烟碱类杀虫剂的可行性.杀虫剂包括:啶虫咪(acetamiprid),吡虫啉(imidacloprid)和噻虫啉(thiacloprid).色拉蔬菜有四种:番茄、辣椒、莴苣和黄瓜.本文介绍的内容包括三种氯烟碱类杀虫剂的LC/MSDTOF和LC/MSD Trap质谱,TOF获得的实验分子式和四种蔬菜基质中氯烟碱类杀虫剂的MS/MS碎片离子.同时也将详细介绍样品制备程序以及色拉蔬菜中杀虫剂的回收、最低检测限(MDL)的质谱质量、线性,使用TOF和Trap对纯溶剂和四种蔬菜提取物中杀虫剂的定量分析.给出了来自市场的实际色拉蔬菜样品中杀虫剂的分析结果. 相似文献
194.
保护海水免受杀虫剂污染的卫生学问题 总被引:1,自引:0,他引:1
据联合国世界卫生组织审定,杀虫剂,特别是有机氯杀虫剂(ХОП)是对环境污染面积大,危害严重的一种污染物。目前,杀虫剂同石油产品、重金属、去污剂一样已成为海洋环境的主要污染物。联合国环境规划署指出,从对人体危害的观点来看,杀虫剂于海洋环境的有毒物质中居第二位,仅次于放射性核素和汞。 有机氯杀虫剂对海洋环境的污染具有全球性,且呈增长趋势。在全世界范围大量生产和 相似文献
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The concentration of organochlorine pesticides(OCPs) in tissues and organs of silver carp(Hypophthalmichthys mofitrix) from Guanting Reservoir were investigated to evaluate the pollution potential and distribution of OCPs. A total of 16 OCPs were measured and the concentrations were in the range of 1.61-69.01 ng/g wet weight(ww) for total OCPs, 0.16- 0.75 ng/g ww for HCB. 0.75 -26.80 ng/g ww for SHCH(sum of α-,β-, γ- and δ-HCH) and 0.68-35.94 ng/g ww for SDDT( sum of p, p'-DDE, p, p'-DDD, o, p'-DDT and p, p'- DDT). The mean concentrations of total OCPs, HCB, ∑HCH, and ∑DDT were 18.04, 0.96, 7.14 and 9.28 ng/g ww, respectively. Among the organochlorine pesticides, β-HCH and p, p'-DDE were the most dominant compounds in tissue and organ with the average concentrations of 4.42 and 8.14 ng/g, respectively. The results obtained in this study show that the levels of 16 OCP residues found in silver carps are low and pose no threat to human health and wildlife fed upon them on the basis of existing related quality guidelines. However, recent input of lindane and DDT might still exist in the area investigated and further investigation should be carried on. 相似文献
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The degradation of imazapyr in non-sterile and sterile soils from four sampling sites in Zhejiang, China was studied. The results showed that the half-lives of imazapyr in non-sterile soils were in the range of 30 to 45 d, while 81 to 133 d in sterile( by autoclaving) soils. It means the rate constants of imazapyr under non-sterile conditions were 2.3--4.4 times faster than that under sterile(by autoclaving)conditions, evidently indicating that the indigenous microorganisms in soil play an important role in the degradation of imazapyr. The different sterilization methods could result in different degradation rates of imazapyr. The heat of sterilization of soil largely decreased the degradation. However, the sterile treatment of soil by sodium azide had a different effect from that by autoclaving. Further more, the mechanism was also discussed. Biodegradation in four non-sterile soils accounted for 62% to 78% of imazapyr degradation. In contrast, less than 39% of imazapyr degradation was associated with chemical mechanisms. Therefore, the degradation mechanism was predominantly involved in biology including organisms and microorganisms in soil. Two imazapyr-degrading bacterial strains were isolated in enrichment culture technique and they were identified as Pseudomonas fluorescenes biotype [[ ( ZJX-5 ) and Bacillus cereus (ZJX-9),respectively. When added at a concentration of 50μg/g in mineral salts medium(MSM), ZJX-5 and ZJX-9 could degrade 81% and 87% imazapyr after 48h of incubation. For the treatment of incorporation of ZJX-5 or ZJX-9 into soil, the degradation rate enhanced 3-4 fold faster than that for control samples, which showed an important value in quick decontamination of imazapyr in soil. 相似文献
199.
Reduction of recruitment of Acartia pacifica nauplii from benthic resting eggs due to organochlorine pesticides 总被引:1,自引:1,他引:0
Many estuarine and coastal planktonic copepods depend on the hatching of benthic resting eggs for recruitment ofnauplii to the water column population. The potential effects of two organochlorine pesticides, hexchloriobinzene (HCH) and dichlorodiphenyltrichloroethane (DDT), on the recruitment of A ccu'tla pacifica nauplii from benthic resting eggs in the seabed of Xiamen Bay were experimentally investigated. The abundance of A. pacifica nauplii hatched from the sediment significantly decreased with the increase of pesticide concentration. Trimmed Spearman-Karber analysis gave sediment 96-h LC50 values were 84.81 ng/g for HCH, and 157.94 ng/g for DDT. The median AI (Al50) was -0.77, which suggested that the combined effect of riCH and DDT showed a weak effect than individual effects. There was a positive relationship between mortality and exposure time in DDT treatment, while the relationship was not significant in HCH treatment. The results suggest that organochlorine pesticides can reduce recruitment of A. pacifica nauplii from benthic resting eggs to planktonic population. 相似文献
200.
<正>溴甲烷(Methyl Bromide,Monobromomethane)又称甲基溴、溴代甲烷、一溴甲烷,分子式为CH3Br,为无色透明易挥发、有甜味的液体。分子量94.95,比重1.6755(20/4℃),沸点4.6℃,可溶于乙醇、乙醚、氯仿、二硫化碳、四氯化碳、苯等多数有机溶剂,微溶于水,其本身也是一种溶解性很强的有机溶剂,能腐蚀铝、镁和它们的合金。它在氧气中易燃,在 相似文献