Study on the solid phase extraction of Co(II)-IIDE chelate with C18 disk and its application to the determination of trace cobalt
محل انتشار: همایش ملی مهندسی شیمی
سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,680
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شناسه ملی سند علمی:
NCCEESLAMSHAR01_028
تاریخ نمایه سازی: 9 آبان 1388
چکیده مقاله:
A sensitive, selective and rapid method has been developed for the determination μg l-1 level of cobalt based on the rapid reaction of cobalt(II) with Isopropyl 2-[(isopropoxy carbothioyl) disulfanyl] ethanethioate chelate (IIDE)and the solid phase extraction (SPE) of the colored chelate with Waters Porapak Sep-Park C18 disk. The Isopropyl 2-[(isopropoxy carbothioyl) disulfanyl]ethanethioate chelate can react with Co(II) in the presence of pH 4.2 acetic acid -/sodium acetate buffer solution and cetyl trimethylammonium bromide (CTMAB) medium to form a violet chelate of a molar ratio 1:2 (cobalt to Isopropyl 2-[(isopropoxy carbothioyl) disulfanyl]ethanethioate chelate. This chelate can retained on Waters Porapak Sep-Park C18 disk quantitatively when they passed the disk as aqueous solution. After the enrichment finished, the retained chelate can be eluted from disk by 2.5 ml of ethanol (contain 5% acetic acid). In the measured solution, the molar absorptivity of the chelate is 1.58×/105 1 mol -1 cm-1at 635 nm, and Beer s law is obeyed in the range of 0.01-/0.4 μg ml-1. The relative standard deviation for 11 replicate sample of 0.01 μg.ml-1 level is 2.54%. The detection limit is 0.01 μg ml-1 (in original samples). This method can be applied to the determination of μg ml-1 level of cobalt in drinking water with satisfactory results.
کلیدواژه ها:
Cobalt ، Solid phase extraction spectrophotometry ، Isopropyl 2-[(isopropoxy carbothioyl) disulfanyl] ethanethioate chelate(IIDE)
نویسندگان
Ali MOGHIMI
Department of Chemistry, East Tehran(Ghiam Dasht) Campus Islamic Azad University, Tehran, Iran
Samaneh AGHAJANI
Department of Chemistry, Pishva Varamin Branch Islamic Azad University, Varamin, Iran
Mostafa SHOJAI
Department of Chemistry, Pishva Varamin Branch Islamic Azad University, Varamin, Iran