论文部分内容阅读
本法中,镁采用铬变酸2R显色.利用甘露醇-三乙醇胺进行联合掩蔽.甘露醇与铁生成近无色透明络合物,在pH10.8时为浅黄色.但碱性介质中铬变酸2R可缓慢夺取甘露醇与铁铬合物中的铁而使显色液加深,故单独采用甘露醇掩蔽结果不稳定。三乙醇胺在碱性溶液中可掩蔽Fe~(3+)、Al~(3+)、Ti~(4+)、Sn~(4+)、Mn~(2+)等离子,但因它为粘稠液体自身吸光率大,单独用它掩蔽比色灵敏度很差。在三乙醇胺中加入少量甘露醇对
In this method, chromic acid 2R is used for color development of magnesium, and mannitol-triethanolamine is used for masking.M mannitol and iron are close to colorless and transparent complexes and are light yellow at pH 10.8, but in alkaline medium Chromium sour 2R can slowly capture mannitol and iron in the iron chromium chromogenic liquid to deepen, so alone mannitol masking results instability. Triethanolamine masks Fe ~ (3 +), Al ~ (3 +), Ti ~ (4 +), Sn ~ (4 +) and Mn ~ (2+) ions in alkaline solution. Thick liquid itself absorbance, alone use it to mask colorimetric sensitivity is poor. A small amount of mannitol is added to the triethanolamine