ICP-AES法快速测定卤水中的硫酸根

Rapid Determination of Sulfate in Brine by ICP-AES

尝试建立了电感耦合等离子体发射光谱（ICP-AES）法测定卤水中硫酸根含量的方法。该方法在182.034 nm处的检出限为0.032 4 mg/L,线性范围为0.032 4~1 000 mg/L。实验研究了卤水中常见共存离子对硫酸根测定的影响。该方法经国家标准物质验证,结果与标准值相符。将该方法应用于实际卤水中硫酸根的测定,相对标准偏差（RSD,n=11）小于2.2%,加标回收率为98.1%~104.4%。将该方法的测定值与重量法的结果进行对比,无明显系统偏差。

In the present work, a method for determination of sulfate in brine by inductively coupled plas- ma-atomic emission spectrometry（ ICP- AES）was described. The detection limit for 182. 034 nm and linear rang of the method were 0. 032 4 mg/L and 0.032 4 to 1 000 mg/L. The effects of common coexisting ions on the determination of sulfate were studied. The method was verified by analysis of national certified reference material, and the result was in agreement with the certified value. The method was applied to the determination of sulfate in brines, the relative standard deviations （ RSD, n = 11 ） were lower than 2.2% , and the recoveries of sulfate were in the range from 98.1% to 104.4%. No obvious systematic deviation can be found between the proposed method and the gravimetric method.