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Asma Akhtar,Tasneem Gul Kazi,Hassan Imran Afridi,Mustafa Khan,Muhammad Bilal,Noman Khan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
A modified cloud point extraction method (m-CPE) was developed for the speciation of chromium species (Cr3+ and Cr6+) in artificial saliva extracts (ASE) of snuff products. In this method, Cr3+ was complexed with 8-hydroxyquinoline, which was trapped in nonionic surfactant (Triton X-114), prior to analyzed by electrothermal atomic absorption spectrometer (ETAAS). Whereas, the total extractable Cr was determined by reducing Cr6+ to Cr3+ using Na2SO3 as a reducing reagent. Several parameters were optimized for the developed m-CPE. Under the most favorable conditions, enrichment factor, enhancement factor and limit of detection for the proposed method were 60, 134 and 0.04 μg L−1, respectively having relative standard deviation <5%. Health risks associated with the intake of total Cr in snuff products was also assessed. Estimated daily intake of Cr via sniffing 10 g/day of dry and moist snuff products was found below the maximum tolerable daily intake whereas the calculated risk for cancer due to Cr was observed in the acceptable range of 10 E−6–E−4.
Faheem Shah,Naeemullah,Tasneem Gul Kazi,Rafaqat Ali Khan,Murtaza Sayed,Hassan Imran Afridi,Khizar Hussain Shah,Jan Nisar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
A novel restricted access sorbents based micro solid phase extraction (RAS-mSPE) for the extraction ofheavy metal from biological samples has been developed. Cadmium (Cd) and manganese (Mn) weredirectly extracted skipping the tedious, time consuming and expensive sample preparation stepexcluding all of the existing proteins. Sorbent’s (activated carbon cloths) surface was modified withbovine serum albumin through glutaraldehyde to make restricted access sorbent (RAS). Differentvariables affecting the extraction efficiency were selected for optimization. The limits of detectionobtained for Cd and Mn were 0.252 and 0.214 mg L 1, respectively. Analyte recoveries in fortified humanwhole blood serum and milk samples were found in the range of 90.3–103.9%. The procedure waseffectively used for Cd and Mn extraction in real samples devoid of any pretreatment step.