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提出了纳米二氧化铈吸附富集痕量铬,2mol.L-1氢氧化钠溶液作洗脱剂洗脱,用二苯卡巴肼分光光度法测定环境水样中铬(Ⅵ)含量的方法。在pH 4.0的介质中、吸附时间为40min、吸附剂用量为20mg时,纳米二氧化铈对铬(Ⅵ)的吸附容量为696μg.g-1。铬(Ⅵ)与二苯卡巴肼络合物的最大吸收波长为540nm,其质量浓度在0.012～1.2mg.L-1之间呈线性,检出限(3σ)为0.01mg.L-1。方法用于环境水样中铬的测定,加标回收率为99.4%。
A new method for the determination of chromium (Ⅵ) in environmental water by spectrophotometry with diphenylcarbazide was proposed. The method was based on the adsorption of trace amount of chromium and nano-ceria to elute 2 mol.L-1 sodium hydroxide solution. The adsorption capacity of chromium (VI) for nano-ceria was 696μg.g-1 in the medium of pH 4.0 with the adsorption time of 40min and the adsorbent dosage of 20mg. The maximum absorption wavelength of chromium (Ⅵ) and diphenylcarbazide complex was 540 nm, and the linear range was 0.012 ~ 1.2 mg.L-1. The detection limit (3σ) was 0.01 mg.L-1. The method was applied to the determination of chromium in environmental water samples with the recovery of 99.4%.