【摘要】 合成了二安替比林-（2-溴）苯基甲烷（DAoBM）并用元素分析、红外分析对其进行了鉴定。在吐温-20和Mn（Ⅱ）存在下.DAoBM与铬（Ⅵ）反应,生成橙红色产物。λ_max=480nm,摩尔吸光系数ε=6.62×10⁵L·cm^-1·mol^-1。铬量在0.5～6.0μg/25ml间符合比尔定律。用于标钢中微量铬（Ⅵ）的测定,结果满意。更多还原

【Abstract】 Diantipyryl-（o-bromo）phenylmethane （DAoBM） was synthesised, its structure was identified. A sensitive and selective spectrophotometdc method has been developed for the determination of Cr （Ⅵ） with DAoBM in the presence of Tween-20 and Mn （Ⅱ）. Cr （Ⅵ） reacts with DAoBM to form a orange-red product in the medium of phosphoric acid. The maximun absorbance of the product is at 480nm with molar absorptivity of 6.62×10.5L·mol^-1·cm^-1. Beer’s law is obeyed in the range of 0.5-6.0μg/25ml. The method has been applied to the determination of Cr （Ⅵ） in chromium steel.更多还原