摘要
在阿拉伯树胶存在下的酸性介质中，铋（Ⅲ）、镉（Ⅱ）分别与碘化钾、罗丹明Ｂ形成水溶性的三元离子缔合物，据此提出了测定铋、镉的高灵敏度的分光光度法。离子缔合物的摩尔吸光系数分别为４．７０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１和６．３０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，最大吸收波长分别在５８０ｎｍ和５８８ｎｍ处。铋（Ⅲ）浓度在０～８μｇ／２５ｍＬ，镉（Ⅱ）浓度在０～３μｇ／２５ｍＬ范围内符合比尔定律。本方法用于低合金钢中铋和镉的测定，结果较好。
Based on the formation of ion-association complexes of biSmuth(Ⅲ) and cadmium withpotassium iodide and rhodamine B in an and medium and in the presence of arabic gum, a highlysensitive spectrophotometic method has been developed. Their water soluble ion-association complexesare at 580um and 588um respectively,and their apparent molar absorptivities 4. 70 × 105 L.mol-1 .cm-1and 6. 30× 105 L.mol-1 .cm-1. Bee′s law operates for 0￣8μg/25mL of Bi and 0￣3μg/25mL ofCd. This method is applied to the direct determination of and Cd in low alloy steels.
出处
《青岛化工学院学报（自然科学版）》
1996年第4期326-329,共4页
Journal of Qingdao Institute of Chemical Technology(Natural Science Edition)
关键词
铋
镉
碘化钾
分光光度法
bismuth(Ⅲ)
cadmium(Ⅱ)
potassium iodide
rhodamine B
spectrophotometry
