论文部分内容阅读
5-Br-PADAP测定锑具有较高的选择性和稳定性。曾在硫酸介质中对题述体系的光度性质进行研究并已用于纯铜及某些铜合金中锑的测定。在硫酸介质中,碘锡酸络离子与5-Br-PADAP有一定的反应性能,故锡的允许量不大。而在盐酸介质中形成氯锡酸络离子,则有助于消除锡对锑测定的影响。本文研究了乳化剂OP存在下,以焦磷酸钠为掩蔽剂,盐酸介质中用碘化钾-5-Br-PADAP作显色剂,于水相分光光度测定纯锡中锑的显色条件。络合物的表观摩尔吸光系数ε_(620)=3.4×10~4。在0—8微克/10毫升
5-Br-PADAP Determination of antimony with high selectivity and stability. The photometric properties of the subject system have been studied in sulfuric acid media and have been used for the determination of antimony in pure copper and some copper alloys. In sulfuric acid medium, Iodostat complex ions and 5-Br-PADAP have a certain reaction performance, so the allowable amount of tin is not large. The formation of chlorotoluene complex ions in hydrochloric acid medium helps to eliminate the influence of tin on the determination of antimony. In this paper, the presence of emulsifier OP, with sodium pyrophosphate as a screening agent, hydrochloric acid medium with potassium iodide-5-Br-PADAP as a developer, aqueous phase spectrophotometric determination of tin in pure tin color conditions. The apparent molar absorptivity ε_ (620) of the complex was 3.4 × 10 ~ 4. At 0-8 μg / 10 ml