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首页> 外文期刊>Analytical Sciences >Micellar-mediated Extractive Spectrophotometric Determination of Hydrogen Sulfide/Sulfide through Prussian Blue Reaction: Application to Environmental Samples
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Micellar-mediated Extractive Spectrophotometric Determination of Hydrogen Sulfide/Sulfide through Prussian Blue Reaction: Application to Environmental Samples

机译：胶束介导的普鲁士蓝反应萃取光度法测定硫化氢/硫化物：在环境样品中的应用

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摘要

A sensitive surfactant-mediated extractive spectrophotometric method has been developed, based on the reaction of ferric iron with sulfide to form ferrous iron and its subsequent reaction with ferricyanide to form Prussian Blue, to quantify trace levels of hydrogen sulfide/sulfide in environmental samples. The method obeys Beer’s law in the concentration range 2 ? 10 μg of sulfide in 25 mL of aqueous phase with molar absorptivity (ε) of 3.92 × 10~(4) L mol~(?1) cm~(?1). The colored species has been extracted into isoamyl acetate in the presence of a cationic surfactant i.e . cetylpyridinium chloride, to enhance the sensitivity of the method with ε value 5.2 × 10~(4) L mol~(?1) cm~(?1). The relative standard deviation has been found to be 0.69% for 10 determinations at 4 μg of sulfide and the limit of detection was 0.009 μg mL~(?1). The interference from common anions and cations has been studied. The proposed method has been applied to the determination of residual hydrogen sulfide in the laboratory fume hood as well as ambient atmospheric hydrogen sulfide in the vicinity of open sewer lines after fixing the analyte in ionic form using suitable trapping medium.
机译：基于三价铁与硫化物反应生成亚铁，然后与三价铁反应形成普鲁士蓝，开发了一种敏感的表面活性剂介导的萃取光度法，以定量测定环境样品中的痕量硫化氢/硫化物。该方法在浓度范围2？内符合比尔定律。在25 mL水相中含10μg硫化物，摩尔吸收率（ε）为3.92×10〜（4）L mol〜（？1）cm〜（？1）。在阳离子表面活性剂存在下，将有色物质萃取到乙酸异戊酯中。氯化十六烷基吡啶鎓，以提高ε值5.2×10〜（4）L mol〜（？1）cm〜（？1）的灵敏度。在4μg硫化物下10次测定的相对标准偏差为0.69％，检出限为0.009μgmL〜（？1）。已经研究了常见阴离子和阳离子的干扰。该方法已被用于测定实验室通风橱中残留的硫化氢，以及使用合适的捕集介质将分析物固定为离子形式后，在开放的下水道附近测定大气中的硫化氢。

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