疏水性离子液体萃取-原子吸收光谱法分离分析微量金

摘要

In the present paper, the hydrophobicity ionic liquid 1-butyl-3- methylimidazolium hexafluorophosphate ([C4mim][PF6]) was synthesized with 1-methylimidazole and butylbromide and equimolar ammonium hexafluorophosphate, which was applied to preconcentration for trace gold. The factors which may affect preconcentration of gold were investigated. The experimental results showed that the absorbance was linear when the concentration of gold was in the range of 0.40～16.00μg · mL-1 ,with linear equation A＝ 0.007 63c ＋0.073 87(c:μg·mL-1), correlation coefficient r ＝ 0.999 1, and detection limit 0.072 μg· mL-1. The method was applied to the determination of trace gold in water samples satisfactorily.%以N-甲基咪唑和溴代正丁烷及六氟磷酸铵合成了疏水性离子液体1-丁基-3-甲基咪唑六氟磷酸盐([Bmim][PF6]).运用该离子液体分离富集分析了微量金.以火焰原子吸收光谱法(FAAS)为分析检测手段,探讨了离子液体萃取预富集微量金的条件.实验结果表明:金的浓度在0.40～16.00μg·mL-1范围内与吸光度成线性关系,线性方程为A=0.007 63c+0.073 87(c:μg·mL-1),r=0.999 1,检测限为0.072μg·mL-1.该法用于样品测定结果令人满意.