摘要
研究了新试剂 2 ,6 二溴 4 氯基偶氮羧胂 (DBCCA)与铋的显色反应。在硫酸和磷酸的混酸介质中 ,铋与DBCCA发生灵敏的显色反应形成蓝色络合物 ,其最大吸收峰位于 63 0nm ,表观摩尔吸光系数为 2 0 3 1× 10 5,在 2 5mL溶液中 ,铋质量在 0～ 2 5 μg符合比尔定律 ;DBCCA与铋的显色反应迅速 ,络合物的吸光度至少可以稳定 2 4h。此外 ,该方法具有良好的选择性 ,尤其是大量铜不干扰微量铋的测定 ,可用于铜合金中痕量铋的直接测定。
The color reaction of 2,6-dibromo-4-chloro-carboxylarsenazo (DBCCA) with bismuth*#has been studied in detail.In the mixed medium of sulfuric and phosphoric acid,bismuth reacts with DBCCA sensitively and selectively to form a blue complex,which has a maximum absorptive peak at 643nm with an apparent molar absorptivity being 2.031×10 5L.mol -1 .cm -1 . Beer′s law is obeyed in the range of 0-25μg/25mL for bismuth*#. The reaction of bismuth*#with DBCCA is rapid and the absorbance of complex can be stable for at least 24h.Moreover,the proposed method has very good selectivity,especially a large amount of copper can be tolerated.So it has been applied to determine bismuth directly in copper-base alloy.
出处
《冶金分析》
CAS
CSCD
北大核心
2003年第1期7-8,11,共3页
Metallurgical Analysis
