王水溶解-电感耦合等离子体发射光谱法测定铁矿石中的微量磷

Aqua Regia Dissolved-Inductively Coupled Plasma Atomic Emission Spectrometry Method for Determination of Trace Phosphorus in Iron Ore

样品经王水分解后,在电感耦合等离子体发射光谱仪上测定了样品溶液中磷的含量.通过实验确定了基体元素的干扰、酸度、样品提升量、雾化气流速、功率、观测高度、分析谱线等分析条件.通过铁的干扰实验结果表明,样品中的基体元素铁不影响磷含量的测定.在用P178.222 nm分析线测定时,方法的检出限为P 0.0006%(相对于0.1 g样品,定容至100 mL),相对标准偏差在3.14%～6.04%(n=11),样品加标回收率在92%～110%.方法测定样品中磷含量的结果同光度法测定结果对比数据相符.

After the sample is decomposed with aqua regia, the determination of phosphorus content in the sample solution by inductively coupled plasma atomic emission spectrometry is carried out. Through experiments the analysis conditions such as the matrix interference, acidity, enhance ment of amount of samples, gas velocity of atomization, power, height of observation, analytical spectral lines are determined. The results show that the interference of iron, sample matrix of elemental iron does not affect the determination of phosphonis content. In the P 178. 222 nm line determination, the detection limit was P 0. 0006% （ corresponding to 0.1 g of sample, in a constant volume of 100 mL） , the relative standard deviation was 3.14% - 6.04% （ n = 11 ） , the rates of spiked recovery were 92% - 110%. The results of the determination of phosphorus content in the sample by this method accorded with the results of photometric determination.