【摘要】 以十六烷基三甲基溴化铵为增敏剂,二苯碳酰二肼与铬(Ⅵ)离子显色,建立了增敏光度法测定痕量铬(Ⅵ)含量的新方法。测定的线性范围为5~300 ng mL-1,检出限为2 ng mL-1,对浓度为20 ng mL-1的铬(Ⅵ)标准溶液进行了11次平行测定,其相对标准偏差为0.5%。利用此法测定了自来水样、景观用水等水中的铬(Ⅵ),结果与原子吸收法测定结果基本吻合。更多还原

【Abstract】 Based on the enhance action of CTMAB on the indication reaction between chromium（Ⅵ） and DPC,a new enhanced spectrophotometric method for the determination of chromium（Ⅵ） is proposed.The linear range is 5-300 ng mL^-1 and the detection limit is 2 ng mL^-1.The relative standard deviation of 11 replicate determinations of 20 ng mL^-1 chromium（Ⅵ） is 0.5%.The method has been applied to the determination of chromium（Ⅵ） in the water samples.The results agreed well with those obtained by flame atomic absorption spectrometric methods.更多还原