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首页> 外文期刊>Journal of the Brazilian Chemical Society >Solid phase extraction and spectrophotometric determination of mercury in tobacco and tobacco additives with 5-(p-aminobenzylidene)-thiothiorhodanine
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Solid phase extraction and spectrophotometric determination of mercury in tobacco and tobacco additives with 5-(p-aminobenzylidene)-thiothiorhodanine

机译：5-（对氨基苄叉基）-硫代硫代罗丹宁固相萃取和分光光度法测定烟草和烟草添加剂中的汞

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摘要

A highly sensitive, selective and rapid method for the determination of mercury based on the rapid reaction of mercury(II) with 5-(p-aminobenzylidene)-thiorhodanine (ABTR) and the solid phase extraction of the colored chelate with C18 disks has been developed. At pH 3.5 and in the presence of emulsifier-OP medium, ABTR reacts with mercury(II) to form a red chelate of a 1:2 (mercury to ABTR) molar ratio. This chelate was enriched by solid phase extraction with C18 disks and the retained chelate eluted form the disks with dimethyl formamide (DMF). An enrichment factor of 50 was achieved. In the DMF medium, the molar absorptivity of the chelate is 1.21´10(5) L mol-1 cm-1 at 545 nm, and Beer's law is obeyed in the 0.01~3 μg mL-1 range in the measured solution. The relative standard deviation for eleven sample replicate measurements at the 0.01 μg mL-1 level is 1.7%. This method was applied to the determination of mercury in tobacco and tobacco additives and good preconcentration was found between proposed and comparative methods results.
机译：一种基于汞（II）与5-（对氨基苄叉基）-硫代罗丹宁（ABTR）的快速反应并用C18盘固相萃取有色螯合物的高灵敏，选择性，快速的汞测定方法。发达。在pH 3.5和乳化剂-OP介质存在下，ABTR与汞（II）反应形成摩尔比为1：2（汞与ABTR）的红色螯合物。通过用C18盘进行固相萃取富集这种螯合物，并用二甲基甲酰胺（DMF）从盘中洗脱保留的螯合物。富集因子达到50。在DMF介质中，在545 nm处螯合物的摩尔吸收率为1.21´10（5）L mol-1 cm-1，在被测溶液中，在0.01〜3μgmL-1范围内遵守比尔定律。在0.01μgmL-1浓度下进行11次样品重复测量的相对标准偏差为1.7％。该方法用于烟草和烟草添加剂中汞的测定，在提议的方法和比较方法的结果之间发现良好的预浓缩。

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