纳米氧化铝预富集火焰原子吸收光谱法测定天然水中铬(Ⅵ))  

Pre-concentration with nanometer-sized alumina and determination trace chromium(Ⅵ) in natural water by flame atomic absorption spectrometry

作　　者：丁健华[1] 李加新[1] 洪茵[1] 

机构地区：[1]佛山科学技术学院化学与化工系,广东佛山528000

出　　处：《佛山科学技术学院学报（自然科学版）》2004年第3期51-54,共4页Journal of Foshan University(Natural Science Edition)

摘　　要：研究了纳米氧化铝对Cr( )的吸附性能,考察了酸度、共存离子等对吸附过程的影响,优化了光谱测定的条件。实验表明:在pH2～2.5时,Cr(VI)被定量吸附,而Cr( )不被吸附。在超声波的作用下,2mol/LHCl可定量洗脱Cr( )。方法用于实际水样中Cr( )的分析,结果满意。A new method for separation and pre-concentration of Cr(Ⅵ) in natural water with nanometer-sized alumina and determination by flame atomic absorption spectrometry has developed. The adsorption behaviors of nanometer-sized alumina for separation and pre-concentration have been studied in detail. Its effects on pH and coexisting ions were investigated, the spectral detection has been optimized. The experiment results show that Cr(Ⅵ) could be adsorbed completely under the pH2.2, and the Cr(Ⅵ) adsorbed on nanometer-sized alumina can be eluted certain amount with 2 mol/LHCl. The method applied to determination Trace Chromium(Ⅵ) in natural water has satisfactory results.

关 键 词：纳米氧化铝 预富集 火焰原子吸收光谱(FAAS) 铬(Ⅵ) 

分 类 号：O657.31[理学—分析化学]