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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。
Attempt to establish a method for the determination of sulfate in brine by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). The detection limit of this method was 0.032 4 mg / L at 182.034 nm with a linear range of 0.032 4-1 000 mg / L. The effect of common coexisting ions in brine on sulfate determination was experimentally investigated. The method by the national standard material verification, the results are consistent with the standard value. The method was applied to the determination of sulfate in brine. The relative standard deviation (RSD, n = 11) was less than 2.2% and the recoveries were 98.1% -104.4%. The measured value of this method is compared with the result of gravimetric method, and there is no obvious systematic deviation.