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测定微量镁的光度法常用的有二甲苯胺蓝口法等,近年来提出的铬天青、漂蓝6B等多元配合物光度法具有更高的灵敏度本文研究了在混合表面活性剂 CPB 和乳化剂 OP存在下,用4,5-二溴苯基萤光酮(Br-PF)分光光度法测定微量镁。在 pH11.0时,Mg(Ⅱ)一Br-PF—CPB—OP 形成深蓝色的多元配合物,最大吸收波长在610nm,ε=1.38×10~5,是目前测定镁的光度法中灵敏度最高的方法之一。配合物的颜色在10小时内稳定不变。在掩蔽剂存在下,100倍镁量的钙不干扰,有较好的选择性。
Spectrophotometric determination of trace magnesium spectrophotometry with commonly used methods such as the blue toluidine blue method proposed in recent years chrome azure, blue and other blends multi-complex blue 6B with higher sensitivity photometric method in this study mixed surfactant CPB and emulsification In the presence of OP, trace amounts of magnesium were determined by spectrophotometry with 4,5-dibromophenylfluorone (Br-PF). At pH11.0, Mg (Ⅱ) -Br-PF-CPB-OP formed a dark blue multi-component complex with the maximum absorption wavelength at 610 nm and ε = 1.38 × 10 ~ 5, which is the highest sensitivity in the spectrophotometric determination of magnesium One of the ways. The color of the complex is stable within 10 hours. In the presence of masking agent, 100 times the amount of magnesium does not interfere with calcium, with better selectivity.