Development of a Non-aqueous-Phase Chemical Vapor Generation Method for the Determination of Se(IV) and Bismuth in Water Samples and Spirulina

作者：Zeng, Chujie^*; Dong, Xiaoqun; Wang, Ye; Huang, Mengshi; Tang, Jing

来源：Food Analytical Methods, 2015, 8(9): 2294-2300.

DOI：10.1007/s12161-015-0119-5

• Selenium
• Bismuth
• Chemical vaporgeneration
• Fluorine-free ionic liquids
• Non-aqueous phase
• Thermospray flame furnace atomic absorption spectrometry

A novel method for the chemical vapor generation (CVG) of selenium and bismuth in non-aqueous-phase based on fluorine-free ionic liquids (FFILs) coupled with liquid-liquid microextraction (LLME) by thermospray flame furnace atomic absorption spectrometric (TS-FF-AAS) determination was developed. This method is based on the complex of selenium and bismuth with ammonium pyrroldinedithiocarbamate (APDC) and dithizone, respectively. The formed hydrophobic complexes are subsequently extracted into 1-octyl-3-methylimidazolium perchlorate (fluorine-free ionic liquids) by liquid-liquid microextraction. Volatile species of Se(IV) and Bi were effectively generated through reduction of the extraction organic phase with solid KBH4 in non-aqueous phase. Some parameters that influenced CVG, extraction, and subsequent determination were evaluated in detail, such as the concentrations of FFILs, APDC and dithizone, pH and temperature of samples, flow rates of carrier gas, as well as interferences. Under optimized conditions, the detection limits (LODs) for Se(IV) and Bi were 4.8 and 8.3 ng mL(-1), respectively. Relative standard deviations for five replicate determinations of the standard solution containing 200 ng mL(-1) Se(IV) and 400 ng mL(-1) Bi were 4.9 and 5.3%, respectively. The proposed method was successfully applied to the determination of Se(IV) and Bi in natural water samples, spirulina sample, and certified reference materials with satisfactory results.

• 出版日期2015-10
• 单位玉林师范学院