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مقالات شیمیایی 2013
جزئیات رویداد
اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
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  • ultra-trace determination of pb(ii) and cd(ii) in drinking water and alcoholic beverages using homogeneous liquid-liquid extraction followed by flame atomic absorption spectrometry

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 999
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the determination of pb(ii) and cd(ii) in different sample matrices, including drinking water, distilled spirits and fruit wine, was carried out by flame atomic absorption spectrometry (faas) after pre-concentration using homogeneous liquid-liquid extraction (hlle). first, the hlle method was optimised with lead diethyldithiocarbamate (pb-ddtc) complex which was extracted with a perfluorooctanoate anion (pfoa−) dissolved in lithium hydroxide under acidic conditions. the optimum extraction conditions, using 0.01 m ddtc, 0.05 m pfoa−, 3 m hcl and 1 ml of 30 vol. % acetone, were obtained. the pb-ddtc complex in the nitric acid digest of the samples (50–150 ml) was extracted quantitatively into a drop of 100 μl of sediment phase. the sediment phase dissolved in 1 vol. % hno3 with at least 3–5 ml of the final volume was then determined by faas, affording a pre-concentration factor of 10–50. hence, the hlle method afforded an increase in both sensitivity and selectivity for the metal determination by conventional faas, resulting in ultra-trace level detection of pb(ii) in all samples analysed (drinking water, 9.2–23 ng ml−1; distilled spirits, 23–50 ng ml−1; fruit wine, 24–53 ng ml−1). in addition, the proposed method could successfully be applied to cd(ii) determination in these samples.

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