Baig Jameel A, Kazi Tasneem G, Shah Abdul Q, Arain Mohammad B, Afridi Hassan I, Kandhro Ghulam A, Khan Sumaira
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Sindh, Pakistan.
Anal Chim Acta. 2009 Sep 28;651(1):57-63. doi: 10.1016/j.aca.2009.07.065. Epub 2009 Aug 8.
The simple and rapid pre-concentration techniques viz. cloud point extraction (CPE) and solid phase extraction (SPE) were applied for the determination of As(3+) and total inorganic arsenic (iAs) in surface and ground water samples. The As(3+) was formed complex with ammonium pyrrolidinedithiocarbamate (APDC) and extracted by surfactant-rich phases in the non-ionic surfactant Triton X-114, after centrifugation the surfactant-rich phase was diluted with 0.1 mol L(-1) HNO(3) in methanol. While total iAs in water samples was adsorbed on titanium dioxide (TiO(2)); after centrifugation, the solid phase was prepared to be slurry for determination. The extracted As species were determined by electrothermal atomic absorption spectrometry. The multivariate strategy was applied to estimate the optimum values of experimental factors for the recovery of As(3+) and total iAs by CPE and SPE. The standard addition method was used to validate the optimized methods. The obtained result showed sufficient recoveries for As(3+) and iAs (>98.0%). The concentration factor in both cases was found to be 40.
采用简单快速的预富集技术，即浊点萃取（CPE）和固相萃取（SPE），测定地表水和地下水样品中的As(3+)和总无机砷（iAs）。As(3+)与吡咯烷二硫代氨基甲酸铵（APDC）形成络合物，在非离子表面活性剂Triton X-114中被富表面活性剂相萃取，离心后，富表面活性剂相用0.1 mol L(-1) HNO(3)的甲醇溶液稀释。水样中的总iAs吸附在二氧化钛（TiO(2)）上；离心后，将固相制成浆液进行测定。采用电热原子吸收光谱法测定萃取的砷形态。应用多变量策略估算CPE和SPE回收As(3+)和总iAs的实验因素最佳值。采用标准加入法验证优化方法。所得结果表明As(3+)和iAs的回收率足够高（>98.0%）。两种情况下的浓缩因子均为40。
