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受钼精矿基体效应及钼元素干扰等因数影响,电感耦合等离子体发射光谱(ICP-OES)法无法直接应用于砷的检测。以硝酸、高氯酸分解试样,过滤去除钼酸沉淀,滤液应用ICP-OES多谱拟合(MSF)法消除残余钼对砷的光谱干扰,建立了适合钼精矿中砷的检测方法。对方法的准确度和精密度进行实验,钼精矿中砷的加标回收率为96.0%～104.7%,相对标准偏差RSD为3.4%～5.2%。实验证明,方法简化了分析流程,具有准确性和重现性均好的优点,方法检出限0.045μg/mL,满足各品级钼精矿中砷的测定。
Due to the matrix effect of molybdenum concentrate and the interference of molybdenum elements, the ICP-OES method can not be directly applied to the detection of arsenic. The sample was decomposed with nitric acid and perchloric acid, and the precipitate of molybdic acid was removed by filtration. The filtrate was used to eliminate the spectral interference of residual molybdenum to arsenic by ICP-OES multi-spectrum fitting (MSF) method. Arsenic detection method for molybdenum concentrate was established. The accuracy and precision of the method were tested. The recovery of arsenic in molybdenum concentrate was 96.0% -104.7%, and the relative standard deviation (RSD) was 3.4% -5.2%. Experiments show that the method simplifies the analytical procedure and has the advantages of good accuracy and reproducibility. The detection limit of this method is 0.045 μg / mL, which can meet the determination of arsenic in various grade molybdenum concentrates.