光度法测钡,一般用变色酸的双偶氮衍生物如偶氮脚Ⅲ、二甲偶氮磺Ⅲ等作显色剂,但这类显色剂的灵敏度和选择性均不够理想,本文介绍采用DBS-偶氮胂作显色剂,此显色剂在偶氮基的邻、对位上引入了吸电子能力很强的嗅原子,使其与钡的显色反应具有更高的灵敏度和更优越的选择性。该试剂在HCl介质中用于硅钡孕育剂中钡的测定已有报道,在用于硅铝钡铁中测钡时,HCl介 Photometry barium, the general use of chromogenic acid disazo derivatives such as azo pin Ⅲ, dimethyl azo sulfur Ⅲ as a developer, but the sensitivity and selectivity of such developers are not ideal, this article describes Using DBS-arsenazo as a color reagent, this color-developing reagent introduces a strong electron-withdrawing atom in the ortho and para positions of the azo group to make it more sensitive to the color reaction with barium and More superior selectivity. The use of this reagent in the HCl medium for the determination of barium in silicon-containing barium inoculants has been reported. When barium is used in barium-aluminum-silicon-barium, HCl