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本文研究了在HCl与H_3pO_4的混合酸介质中,乳化剂OP存在下,铬(Ⅵ)与2.7-二溴茜素紫(DBV)的显色反应。配合物组成Cr(Ⅵ):DBV=1:3,表观摩尔吸光系数为2.74×10~4L·mol~(-1).cm~(-1)(λmax=416nm)。反应的选择性高,常见金属离子均不干扰铬(Ⅵ)的测定,拟定了用二溴茜素紫分光光度法测定金属材料中铬的方法。
In this paper, the color reaction between chromium (Ⅵ) and 2.7-dibromoalizarin violet (DBV) was studied in the presence of emulsifier OP in a mixed acid medium of HCl and H_3pO_4. The complex has the composition of Cr (Ⅵ): DBV = 1: 3, the apparent molar absorptivity is 2.74 × 10 ~ 4L · mol ~ (-1) · cm ~ (λmax = 416nm). The selectivity of the reaction was high. Common metal ions did not interfere with the determination of chromium (Ⅵ). A method for the determination of chromium in metallic materials by dibromoalizol violet spectrophotometry was developed.