电感耦合等离子体发射光谱法测定锌精矿中的二氧化硅

采用碱熔酸化方法处理样品,选用金为内标元素,电感耦合等离子体发射光谱法测定锌精矿中的二氧化硅。研究了熔融试样时引入的基体元素钠对被测元素的干扰情况,结果表明基体效应明显存在,且随着钠量的增加,基体效应显著增强,仪器稳定性严重降低,影响测定结果的准确度。内标校正法有效克服了基体效应及仪器波动产生的影响。研究结果表明,二氧化硅的检出限为0.006 3 mg/L,测定范围为0.02%~10%,对矿石标准物质进行测定,结果与标准值一致,方法精密度(RSD,n=5)小于2%。

Determination of SiO2 in Zinc Concentrates by Inductively Coupled Plasma-Atomic Emission Spectrometry

The zinc concentrates were digested by alkali fusion.The SiO2 in zinc concentrates were determined by inductively coupled plasma-atomic emission spectrometry(ICP-AES) with adding Au as internal calibration.The matrix interference effect was studied in this article.The matrix interference effect and the stability of instrument were worse along with Na increasing,which reduced accuracy of determination.The matrix interference effect and the instrument fluctuation have been overcome by using internal calibrati...