等离子体原子发射光谱法间接测定铁红中微量硫酸根的研究

Indirect determination of micro SO_4^(2-) in iron oxide red using inductive coupling plasma atomic emission spectrometry

用一定量的 Ｂａ２＋将铁红（Ｆｅ２Ｏ３）中的 ＳＯ２４以 ＢａＳＯ４形式分离，然后用等离子体光谱法测定余量的Ｂａ２＋，从而间接测得ＳＯ２４的含量．该法操作简便、检测快速，相对标准偏差小于９．０％（ｎ＝５），加料回收率９３．０％～９９．３％．

In this paper, a method is proposed in which a certain amount of Ba2+ is added into a iron oxide red (Fe2O3) solution so that SO2-4 in it is separated in the form of BaSO4, the ex-tra Ba2+ in the solution is then determined by ICP-AES, thus the content of SO2-4 is indirectly determined. The method is simple in operation, fast in detecting, with the relative stan-dard deviation less than 9. 0% (n=5) and the addition recovery of 93. 0%~99. 3%.