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饮用水中五种有机磷农药的快速检测法 总被引:6,自引:0,他引:6
本文介绍了使用Waters OASIS-HLB固相萃取小柱从水中分离富集敌百虫、敌敌畏、乐果、甲基对硫磷,对硫磷五种有机磷农药的快速检测法。 相似文献
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首次用x-5树脂吸附三丁基锡(TBT)化合物。结果表明,X-5树脂吸附TBT化合物具有吸附容量大、吸附速度快等优点,符合Freundlich吸附等温式;用自制的吸附注(长度为11cm,内径为0.55cm的玻璃管,内装x-5大孔网状树脂,约0.7g)作TBT吸附剂,研究各种因素对吸附及脱附效率的影响。结果表明,吸附率主要取决于柱长及流速,而溶液的盐度及pH值影响不大;脱附率主要取决于洗脱剂的流速,而pH值影响不大;实际样品的回收率超过90%。 相似文献
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固相萃取法提取净化生物检材中三类农药的实验研究 总被引:19,自引:0,他引:19
本文以常见的六种有机磷类、四种氨基甲酸脂类和五种拟种虫菊酯类农药为对象,研究了用国产GDX-403或C18固相小柱同时提取净化环境样品和生物检材中三种类型的农药,分别采用GC/FPD,GC/NPD和GC/ECD三种特征性气相色谱法进行分析鉴定,为系统分析有机农药提供了一套快速、简便的固相提取方法。 相似文献
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水中微量有机磷农药经二氯甲烷萃取、净化、凝胶净化色谱(GPC)浓缩,用带火焰光度检测器(FPD)的毛细管柱气相色谱仪测定.实验结果表明:七种有机磷农药曲线线性良好,相关系数可达0.999以上;检出限能够满足《地表水环境质量标准》限值要求;加标回收率范围为81.4%~92.4%,相对标准偏差范围为2.5%~7.3%,相对误差范围为1.9%~8.5%.可以同时测定《地表水环境质量标准》中规定的7种有机磷农药,提高工作效率. 相似文献
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采用气相色谱法静态顶空进样,HP-1柱分离,FPD检测器检测,测定水中CS2,并对测定条件进行了探讨。实验表明,当取样量为10.0 mL,气液比为12.3,在40℃平衡25 min时,能获得满意的灵敏度,且稳定性很好。二硫化碳在0.63μg/L~502μg/L之间呈线性,相关系数为0.999 2,相对标准偏差为1.3%~5.7%、加标回收率为88%~105%,检出限可达0.3μg/L。干扰试验表明硫化氢、甲硫醇、甲硫醚不干扰二硫化碳的测定。本方法操作简便,测定快速,完全能够满足快速分析水中二硫化碳的要求。 相似文献
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W.P. Cochrane R.B. Maybury R.G. Greenhalgh 《Journal of environmental science and health. Part. B》2013,48(2):197-212
Abstract A study was undertaken to compare and evaluate the different types of 63Ni and 3H electron capture (ECD) and flame photometric detectors (FPD) as part of the Canadian Check Sample Program on Pesticide Residue Analysis. Twenty‐seven laboratories were supplied with chlorpyrifos standard solutions for the determination of linear range and minimum detectable amounts (MDA). Each laboratory selected its own operating conditions except for the FPD study. Results for the FPD were compared with standardized flame conditions designed to optimize the exponential factor in the S‐mode. The MDA of the ECDs (pulsed and direct‐current) ranged from 0.09 to 0.17 pg/sec for 63Ni and 3H sources respectively. The corresponding MDA for the linearized ECDs (pulse modulated or constant current) was 0.04 pg/sec and a linear range of 104 or greater with nitrogen as the carried gas. Use of argon/methane and a pulse width of 0.1 usec extended this range to 105 but the sensitivity was not as great as with nitrogen carrier gas. The practical limit of detector sensitivity was found to be instrument dependent depending primarily on the noise level. In the FPD study, operating in the P‐mode gave an average MDA of 5.97 pg/sec and a linear range of 2 x 103. Similarly, the S‐mode parameters were 81.1 pg/sec and 8 x 102 respectively with an average exponential factor of n 1.8. Attempts to apply optimized detector gas‐flow conditions improved sensitivity and linearity in the S‐mode only. 相似文献
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