火焰原子吸收光谱法测定硫铁矿和硫精矿中的钾和钠

Determination of Potassium and Sodium in Pyrites and Concentrate by Flame Atomic Absorption Spectrometry

火焰原子吸收光谱法(FAAS)已广泛应用于多种岩石矿物中钾和钠的分析测定,然而尚未在硫铁矿和硫精矿中开展应用。本文采用四酸溶样,尿素沉淀分离干扰元素,使用火焰原子吸收光谱法检测硫铁矿和硫精矿中钾和钠含量。通过实验确定了钾和钠方法检出限分别为0.5μg/g和0.12μg/g,加标回收率分别为90.0%~104.0%和90.0%~103.6%,精密度(RSD,n=6)分别为2.30%~3.56%和2.38%~6.45%,准确度(n=6)分别为2.27%~4.55%和4.76%~8.33%。本方法简便快捷,干扰少,准确度高,适合于大批量实际样品的快速检测。

Flame Atomic Absorption Spectrometry（FAAS） was widely applied to the determination of potassium and sodium in many kinds of rocks and minerals.However,this technology is still not applied in Pyrites and concentrate.In this article,a urea-precipitation-separation method is described for the determination of potassium and sodium using FAAS,with samples digested by mixed acid system of HCl-HNO3-HF-HCl O4.The method detection limit of K and Na are 0.5μg/g and 0.12μg/g,the standard addition recovery are from 90.0% - 104.0% and 90.0% - 103.6%,the relative standard deviation（RSD,n=6） are from 2.30% - 3.56% and 2.38% - 6.45%,and the relative error（n=6） are from 2.27% - 4.55% and 4.76% - 8.33%.This method is simple,fast,less interference,and high accurate.It is suitable for practical determination of a large amount of samples.