摘要
研究了用201×7型阴离子交换树脂吸附Cr(Ⅵ),使之与Cr(Ⅲ)及共存离子分离,抗坏血酸-硫酸混合液还原洗脱Cr(Ⅵ),火焰原子吸收光谱法测定环境水样中铬形态.分析了试液上柱酸度、洗涤及洗脱等分离条件对实验结果的影响.结果表明,在最优条件下,测定Cr(Ⅵ)和Cr(Ⅲ)时,相对标准偏差分别为1.2%和1.9%;加标回收率均为98%.方法检出限为0.6μg/L.
Speciation of chromium in environmental water samples was determined by flame atomic absorption spectrometry（FAAS）. Chromium（Ⅵ） was separated from chromium（ Ⅲ ） and other ions with anion-exchange resin, then chromium（Ⅵ） was reduced and eluted by the mixture of ascorbic acid and sulphuric acid. The effects of separate conditions, such as the pH of the test solutions, conditions of washing and elution, etc. are discussed. The results show that, under the optimum conditions, the RSD of the method is 1.2% for chromium（Ⅵ） and 1.9% for chromium（ Ⅲ ）, the rate of recovery is 98% for chromium（Ⅵ） and chromium（ Ⅲ） all. The limit of detection of the method is 0. 6 μg/L.
出处
《徐州师范大学学报（自然科学版）》
CAS
2009年第2期84-87,共4页
Journal of Xuzhou Normal University(Natural Science Edition)
基金
徐州师范大学自然科学基金资助项目(07XLB10)
