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Mariam S. Arain,Tasneem G. Kazi,Hassan I. Afridi,Muhammad Bilal,Jamshed Ali,Abdul Haseeb 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
It is reported in literature that zinc (Zn2+) has antidepressant activity. In present study Zn2+ was analyzed in blood serum of male patients having various psychiatric disorders (schizophrenia, depression, bipolar). As it is usually present in trace levels. Hence a novel, environmental friendly, dual-cloud point extraction (d-CPE) method was developed for the enrichment of its trace levels in acid digested serum samples. In the first step of d-CPE, Zn2+ was complexed with 1-(2-pyridylazo)-2-naphthol (PAN), and the complex was entrapped in a nonionic surfactant (Triton X-114). After achieving cloud point by heating, the mixture was separated into two layers i.e. aqueous and surfactant-rich by centrifugation. In second step of d-CPE, the analyte complex in the surfactant-rich phase was treated wih acid to extract back the metal analytes in acidic aqueous phase, the mixture was again heated upto cloud point and the whole procedure was repeated. This time the aqueous phase, having the metals, was taken and subjected to FAAS using conventional nebulization. The accuracy of the developed methodologies (conventional and d-CPE), were verified by their application to certified reference material of serum (CRM). Reliability of the method was checked by relative standard deviation (%RSD), which was found to be <5%. The limit of detection and limit of quantification were calculated for the proposed method as 1.09 μg/L, and 3.63 respectively and enhancement factor was found to be 40. The developed procedure was successfully applied to the serum samples of patients (male) having different psychiatric disorders and non-psychiatric control subjects for the determination of Zn2+.
Muhammad Bilal,Tasneem G. Kazi,Hassan I. Afridi,Mohammad Balal Arain,Jameel A. Baig,Mustafa Khan,Naeemullah Khan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
A new method based on modification of cloud point extraction for simultaneous enrichment ofcadmium, lead and copper in water and fish muscle samples was proposed. The extraction efficiency bymodified cloud point extraction (m-CPE) was compared with conventional cloud point extraction (c-CPE)method. The procedure for both CPE methods was comprised of formation of metal complexes with ahydrophobic chelating agent, dithizone, followed by entrapment of the chelates in a nonionic surfactant,Triton X-114. For c-CPE, the surfactant rich phase was treated with ethanolic solution of nitric acid andanalyzed by flame atomic absorption spectrometer (FAAS). Whereas for m-CPE, aqueous nitric acid wasused to back extract the metal ions from the surfactant rich phase and finally determined. The efficiencyof the methods was tested by analyzing certified reference material and standard addition to a realsample. All the experimental parameters were optimized. At optimized experimental conditions,preconcentration and enhancement factors were 62.5 and 78.0 to 83.0 respectively for m-CPE, 25.0 and56.0% higher than that of c-CPE. This improvement might be due to elimination of the effects ofsurfactant on the signal of analytes by FAAS. The developed method of m-CPE was applied successfullyfor analysis of the selected heavy metals in water and muscle tissues samples of fish of different lakes inSindh, Pakistan.
Sadaf S. Arain,Tasneem G. Kazi,Hassan I. Afridi,Naeemullah,Kapil D. Brahman,Muhammad B. Arain,Abdul H. Panhwar,Mariam S. Arain,Shahnawaz Baloch 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
A green non-dispersive ionic liquid based microextraction (ND-ILmE) method was proposed for thepreconcentration of trace levels of copper (Cu2+) in artificial saliva extract (ASE) of smokeless tobaccoproducts (SLT). A 100 cm long, narrow glass column containing aqueous solution of Cu/ASE was used toincrease phase transfer ratio by providing more contact area between two medium, which drasticallyimprove the recovery of Cu-PAN complex into ionic liquid 1-butyl-3-methylimidazolium hexafluor-ophosphate [C4mim][PF6]. At optimum experimental conditions, the detection limit and theenhancement factor were found to be 0.042 mg L 1 and 85, respectively. This method was successfullyapplied to real samples.