پديدآورندگان :
Sobhi Hamid Reza - Department of Chemistry, Payame Noor University, Tehran, Iran , Azadikhah Effat - Department of Chemistry, Payame Noor University, Tehran, Iran , Ghambarian Mahnaz ghambarian.m@gmail.com Iranian Research and Development Center for Chemical Industries, ACECR, Tehran, Iran; , Behbahani Mohammad - Department of Mechanical Engineering, Shohadaye Hoveizeh University of Technology, Susangerd, Iran , Esrafili Ali - Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran , Esrafili Leili - Department of Chemistry, Tarbiat Modares University, Tehran, Iran
چكيده فارسي :
Chromium (Cr) is regarded as being very toxic once it is ended up in the aqueous media. Cr mainly exists in two stable forms, Cr(VI) and Cr (III). Cr(VI) is more toxic to the enviroment than Cr(III) due to its carcinogenicity, toxicity and high aqueous solubility [1,2]. In this study, Spectrophotometric determination of Cr(VI) in water samples using dispersive liquid-liquid microextraction method was fully developed. Initially, various factors affecting the extraction of the studied analyte was investigated in detail and the optimum conditions were established using a statistical software. Under the best conditions derived, the the calibration curve was linear over the concentration range of 50-1000 ng/mL. The limit of detection was determined to be 20 ng/mL based on a signal-to-noise ratio of 3. To test the extraction efficiency, the method was applied to various real water samples that were spiked. The average recoveries obtained from the spiked samples ranged between 90 - 118% with relative standard deviations of 6.6 - 12.7%. Finally, the approach was determined to be robust and effective for Cr(VI) in environmental analysis.
