A novel method of extraction spectrophotometric determination of nickel in aqueous two-phase system(ATPS) formed by polyethylene glycol-2000(PEG) and(NH4)2SO4 was developed.The effects of solution acidity,the dosage o...A novel method of extraction spectrophotometric determination of nickel in aqueous two-phase system(ATPS) formed by polyethylene glycol-2000(PEG) and(NH4)2SO4 was developed.The effects of solution acidity,the dosage of xylenol orange(XO),salt and elimination of interference form other coexistence sulstances on the extraction determination of nickel were studied.In PEG-(NH4)2SO4 aqueous two-phase system of pH 3.0-5.0,the complex formed by xylenol orange and Ni2+ had high absorbance with the maximum absorption of 477nm.Beer’s law was obeyed in the range of 0-5.0μg/mL for Ni2+ with the apparent molar absorptivity of 5.14×104 L·mol-1·cm-1.The complex ratio of xylenol orange and Ni2+3∶1.The method has been applied to the determination of nickel in standard aluminium alloy and the results were in agreement with the certified values.展开更多
文摘A novel method of extraction spectrophotometric determination of nickel in aqueous two-phase system(ATPS) formed by polyethylene glycol-2000(PEG) and(NH4)2SO4 was developed.The effects of solution acidity,the dosage of xylenol orange(XO),salt and elimination of interference form other coexistence sulstances on the extraction determination of nickel were studied.In PEG-(NH4)2SO4 aqueous two-phase system of pH 3.0-5.0,the complex formed by xylenol orange and Ni2+ had high absorbance with the maximum absorption of 477nm.Beer’s law was obeyed in the range of 0-5.0μg/mL for Ni2+ with the apparent molar absorptivity of 5.14×104 L·mol-1·cm-1.The complex ratio of xylenol orange and Ni2+3∶1.The method has been applied to the determination of nickel in standard aluminium alloy and the results were in agreement with the certified values.