Photometric Determination Chromium in Aluminium Alloy by Color-fading Reaction of Dibromo-p-methylsulfonazo
摘 要
在硝酸介质中,铬(Ⅵ)与二溴对甲基偶氮磺生成1∶3物质的量比的稳定络合物,导致显色剂二溴对甲基偶氮磺吸光度降低,据此建立了褪色光度法测定铝合金中铬(Ⅵ)含量.对反应介质的种类和酸度、显色剂的用量、反应时间、共存离子的干扰等影响因素进行了试验并予以优化.在530 nm波长测定时,铬(Ⅵ)的质量浓度在0.032~0.48 mg·L-1范围内,反应体系吸光度的降低值ΔA与铬(Ⅵ)浓度呈线性关系,表观摩尔吸光率为4.34×104L·mol-1·cm-1.用于直接测定铝合金中微量铬的含量,测定值与标准值相符.相对标准偏差(n=8)小于2%.
Abstract
A stable complex was formed by the reaction of Cr(Ⅵ) with dibromo-p-methylsulfonazo in the mole ratio of 1 to 3 in dil.HNO3 solution,leading to decrease of absorbance of dibromo-p-methylsulfonazo as color reagent.Influtential factors,including the kinds and concentration of acid in the reaction medium,amount of color reagent,time of reaction,and interference of co-existing ions,were studied and optimized.Linear relationship between the magnitude of decrease in absorbance at 530 nm and the mass concentration of Cr(Ⅵ) was obtained in the range of 0.032-0.48 mg·L-1,and value of apparent molar absorptivity found was 4.34×104L·mol-1·cm-1.The proposed method was used in the determination of Cr(Ⅵ) in aluminium alloy,the results obtained was checked quite well with the standard values,and values of RSD′s (n=8) were less than 2.0%.
中图分类号 O657.32
所属栏目 工作简报
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收稿日期 2008/1/2
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备注钟国秀(1974-),女,湖北省仙桃市人,主要从事金属材料分析.
引用该论文: ZHONG Guo-xiu,HUANG Qing-hua,YAN Gao-hua. Photometric Determination Chromium in Aluminium Alloy by Color-fading Reaction of Dibromo-p-methylsulfonazo[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(5): 596~597
钟国秀,黄清华,晏高华. 二溴对甲基偶氮磺褪色光度法测定铝合金中微量铬[J]. 理化检验-化学分册, 2009, 45(5): 596~597
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【5】于京华,崔瑞珍,王玲波.二溴羧基偶氮胂褪色光度法测定铬的研究[J].分析试验室,2005,24(9):12-15.
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