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本文详细研究了以罗丹明 Ｂ为显色剂，比色法测定 ＡｕＣｌ４－的反应条件。在 ０．５ｍｏｌ·Ｌ－１盐酸介质中，Ａｕｃｌ４与罗丹明Ｂ形成的紫红色络合物被苯萃取到有机相，该络合物λｍａｘ＝５６５ｎｍ，摩尔吸光系数ε为８．８×１０４Ｌ·ｃｍ－１·ｍｏｌ－１，Ａｕ（Ⅲ）浓度在０～１．６ｕｇ／ｍｌ范围内符合比耳定律。
In this paper, the reaction conditions of AuCl4- with rhodamine B as color reagent and colorimetric method were studied in detail. In 0.5 mol·L-1 hydrochloric acid medium, the purple complex formed between Aucl4 and rhodamine B was extracted by benzene into the organic phase. The complex λmax = 565 nm, the molar extinction coefficient ε was 8.8 × 104 L · cm-1 · mol-1, the Beer’s law is obeyed in the range of 0 ~ 1.6ug / ml for Au (Ⅲ).