摘要
为了灵敏、准确地测定天然水中微量四价硒和六价硒的浓度,尝试了利用同位素稀释-MIP-MS分析和离子交换树脂预浓缩分离相结合的方法。在天然水样中添加78Se(Ⅳ)和78Se(Ⅵ)的浓缩稳定同位素溶液,将水样泵入充填有阴离子交换树脂的特氟隆圆柱中浓缩后,富集在树脂上的全部四价硒和一部分六价硒用0.03mol/L硝酸洗脱;残留在树脂上的六价硒接着用0.13mol/L硝酸洗脱。这两种淋洗液分别用同位素稀释-MIP-MS法测定。利用这一方法,可得到天然水中微量四价硒和六价硒的准确浓度。
Isotope dilution analysis of the sub-μg/L levels of selenite and selenate in natural water samples by Microwave-induced nitrogen plasma mass spectrometry(MIP-MS) was performed. An appropriate amount of a spike solution containing78Se-selenite and 78Se-selenate was added to the natural water sample to be analyzed. Both analytes in the water were then concentrated simultaneously by passing the sample through a column that was filled with an anionic exchange resin. After the concentration process,all of the selenite and some of the selenate on the resin were eluted by 0. 03mol/l nitric acid. The residual selenate was eluted by 0.13 mol/L nitric acid. The eluted sample solutions were injected into MIP-MS,and isotope dilution analyses were carried out. Selenite and selenate concentrations as low as 0.01μg/l in the natural water sample were successfully determined by the proposed method.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2010年第S1期256-259,308,共5页
Environmental Science & Technology
