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本文报导用导数示波极谱法直接测定农药中微量三氯乙醛的方法。实验结果表明,三氯乙醛在0.010mol/L NH_4Cl、5.00×10~(-4)mol/L EDTA和2.00×10~(-6)mol/L四乙基溴化铵组成的底液中,于滴汞电极上产生灵敏的峰电流。峰电位为-1.55V(Vs·S·C·E·)。检测下限为3.00×10~(-7)mol/L;浓度在3.00×10~(-7)~1.00×10~(-3)mol/L范围内与峰电流呈良好的线性关系。 相似文献
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Aquatic pollution by metals is of concern because of various toxic effects to marine life. The Tolka Estuary, Co. Dublin, Ireland, is a typical Irish urban estuary. It has a significant metal loading originating from the urban environment. Results of a 25month analysis of cadmium, copper, lead and zinc spatial and temporal distribution over 10 sample locations in this estuary are presented in this paper. Metal concentrations were analysed using differential pulse polarography. Significant seasonal and spatial trends in metal distribution were observed over the 25months. Sediment metal concentrations gradually increased (30-120%) in spring to a maximum at the end of summer which was followed by a decrease in winter months (30-60%). Sediment organic matter (OM) concentrations exhibited similar seasonal trends and a positive correlation between OM and metal distributions was observed, implying OM had an influence on metal distributions over time. 相似文献
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本文拟定了一种测定马拉硫磷残留量的极谱法,在0.1mol/LNaOH基底溶液中,用单扫描示波极谱仪制作其阴极化一阶导数极谱曲线,峰电位Ep为-0.42V(vs.SCE),在0.08-0.5μg/ml范围内i'p与浓度间呈线性关系。讨论了一些常见农药及离子的干扰情况,以及影响溶出峰电流的因素。方法应用于环境水样中马拉硫磷残留量的测定。变异系数在10%以内。 相似文献
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In this investigation, polarographic analyses of water, sediment, and animal samples from Devil's Swamp near Baton Rouge, Louisiana, have been conducted. The focus of this work has been on detection of lead and chromium levels. Lead has been found to be relatively uniformly distributed among the various size fractions of the sediment and is present at a mean level of 18.7 µg g-1. In the water the concentration is about 15 µg L-1 of which 75% is bound in suspended particulates and the remainder is dissolved. Preliminary results indicate that more chromium than lead is present in bone and muscle of bullfrogs, and, for each metal, there is a higher concentration in muscle than bone. The mean lead muscle tissue concentration is 550 µg kg-1, which suggests that bioaccumulation of this metal is occurring, assuming that water contact or ingestion are the main routes of exposure. An important aspect of this research has been optimizing polarographic methodology for performing chromium speciation studies. Methods for determining the amounts of hexavalent and trivalent chromium in mixtures containing the two have been developed. 相似文献
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的MCllvaine缓冲溶液(pH4.9)中,苦味酸有良好的示波极谱峰和微分脉冲极谱峰,其3个峰的电位于-0.22V、-0.33V和-0.4V(SCE),或于-0.21V、-0.31V和-0.40V(银/氯化银)。线性测定的浓度范围为0.005~2.00mg/1,最小检出浓度为0.1ng/ml,平均回收率为99.7%。方法操作简便,可用于水和废水的测定。 相似文献
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