摘要
研究了用十二烷基硫酸钠作硅钼杂多酸的保护剂，在高酸度下消除大量磷的干扰，以混合还原剂使硅钼杂多酸快速还原成硅钼蓝，用光度法测定磷铁合金中的硅．摩尔吸光系数ε＝９．２７×１０３Ｌｍｏｌ－１ｃｍ－１，相对标准偏差为４．２９％（ｎ＝７），加料回收率为９８．７％～１０８．
Lauryl
sodium sulfate is taken as the protecting agent for silicomolybdic heteropolyacid, which can
eliminate a lot of interference from phosphorus. The combined reducing agent is used to rapidly
reduce silicomolybdic heteropolyacid to silicomolybdic\|blue, so that photometry can be used to
determine silicon in P\|Fe alloy. The mole absorptivity equals to
9\^2710\+3L\5mol\+\{-1\}\5cm\+\{-1\};the relative standard deviation 4\^29% ( n=7 ) and the
addition recovery is between 98\^7% and 108\^0%.
出处
《广东有色金属学报》
1999年第1期69-73,共5页
Journal of Guangdong Non-Ferrous Metals
关键词
十二烷基硫酸钠
硅钼蓝光度法
硅
测定
磷铁合金
phosphorus\|iron, lauryl sodium
sulfate, silicomolybdic\|blue photometry
