Speciation of Cr(III)and Cr(VI)by Porous Nano-barium-strontium Titanate and Flame Atomic Absorption Spectrometry
A sensitive method has been developed for the speciation of Cr(Ill)and Cr(VI) jn natural water using a porous nano-barium-strontium titanate by sorghum straw template method(SPBST) and flame atomic absorption speetrometry(FAAS)．The procedure presented based on Cr(IlI)and Cr(VI)show different adsorption capacities on the SPBST at different pH value，that is，Cr(III) selectively retained at pH 13,but Cr(VI) can’t be adsorbed．Whereas Cr (VI)retained at pH 1，but Cr(III)can’t be adsorbed．Hence, Cr(VI)and Cr(III) can be separated through changing pH value of medium．Cr(VI) and Cr(III) adsorbed on the SPBST can be completely eluted using 1·0 mol·L-1 NaOH and 1.0 mol·L-1 HCI,respectively．And Cr(VI)and Cr(III) were determined bv FAAS,The precOncentration factor of the method was 100．At the optimum conditions determined experimentally．the adsorption capacities were calculated to be 21.6 mg·g-1 and 7.3 mg·g-1，respectively．The proposed method was applied to the determination and speciation of chromium in tap water．lake water and wastewater samples with satisfactory results．
porous nano-barium-strontium titanate speciation analysis Chromium preconcentration water flame atomic absorption spectrometry
Dong Zhang
School of Environmental and Chemical Engineering Shenyang Ligong University Shenyang 110159,P．R．China
国际会议
海口
英文
209-211
2011-02-22（万方平台首次上网日期，不代表论文的发表时间）