【摘要】 本文报告了在水－乙醇介质中，２－（５－Ｂｒ－２－吡啶偶氮）－５－二乙二氨基酚（简称５－Ｂｒ－ＰＡＤＡＰ）与钒（Ｖ）形成稳定的配合物，其最大吸收波长为５９５ｎｍ，摩尔吸光系数为３．３×１０４．系统研究了用５－Ｂｒ－ＰＡＤＡＰ分光光度测定钒的适宜条件，试验了其它离子的影响，结果表明仅有个别离子有干扰。钒浓度在０～２３．６μｍｏｌ／Ｌ（０～４０μｇ／２５ｍｌ）范围内遵守比尔定律。该方法用于土壤样品分析，准确度、重现性良好。更多还原

【Abstract】 This paper reports that vanadium and 5-Br-PADAP formed a stable corrdination compound in the medium of water-ethanol.The maximum absorbance of the coordination compound was 595nm. Its apparent molar absorptivity was ε595=3.3×104.The optimum conditions for spectrophotometric determination of vanadium were investigated.The influence of co-existing ions on determination of vanadium was studied. Beer’s law was obeyed within a vanadium concentration range of 0 to 23.6μmol/L. This method has been used to determine vanadium in soils with satisfactory results.更多还原