碘化钾-Cd(Ⅱ)-罗丹明B离子缔合分光光度法测定土壤中微量镉  

Detection of trace cadmium in soil by potassium iodide-Cd(Ⅱ)-Rhodamine B ion association spectrophotometry

作　　者：鲁秀国[1] 过依婷 LU Xiu-guo;GUO Yi-ting(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《应用化工》2018年第11期2550-2553,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目(51768018);国家科技支撑计划项目(2014BAC04B03)

摘　　要：将0. 5 g土壤进行消解,采用碘化钾-Cd(Ⅱ)-罗丹明B离子缔合分光光度法测定土壤中微量镉,最佳反应条件:加入2 m L浓度1 mol/L H2SO4,20%碘化钾-抗坏血酸溶液3 m L,显色40 min,在波长588 nm处测定离子缔合物吸光度。结果表明,Cd(Ⅱ)浓度在0. 25～2. 0μg/m L范围内符合郎伯-比尔定律。本方法测定结果相对标准偏差小于2%,方法检出限2. 1μg/kg,加标回收率98. 90%～100. 60%。实验表明,校园内土壤镉含量0. 035～0. 050 mg/kg范围内,几乎无金属镉污染。0.5 g of soil was digested,and trace cadmium in soil was determined by potassium iodide-Cd(II)-Rhodamine B ion association spectrophotometry.The optimal reaction conditions were as follows:2 mL of 1 mol/L H 2SO 4 and 20%potassium iodide-ascorbic acid solution 3 mL were added,color development for 40 min,and the ion association absorbance was measured at a wavelength of 588 nm.The results showed that the Cd(II)concentration was in the range of 0.25~2.0μg/mL in accordance with Lange-Beer’s law.The relative standard deviation of the method was less than 2%,the detection limit of the method was 2.1μg/kg,and the recoveries were in the range of 98.90%~100.60%.Experiments showed that the soil cadmium pollution in the campus is in the range of 0.035~0.050 mg/kg,and there is almost no metal cadmium pollution.

关 键 词：土壤 Cd(Ⅱ) 离子缔合物 分光光度法 

分 类 号：TQ01[化学工程] O657.32[理学—分析化学]