电感耦合等离子体发射光谱法测定石化废水中的重金属

建立了硝酸加热消解后采用电感耦合等离子体发射光谱(ICP-OES)测定石化废水中重金属(As,Cd,Cr,Cu,Zn,Pb,Mn)的方法,优化了仪器工作参数,得到了线性回归方程,并对该方法进行了评价。优化后的仪器工作参数为射频功率1 150 W、雾化器流量0.70 L/min、辅助气流量0.50 L/min。各重金属元素回归方程的相关系数均在0.999 9以上,检出限为0.000 18~0.007 00 mg/L,相对标准偏差为0.1%~2.0%,加标回收率为96.3%~102.2%。该方法具有线性关系好、检出限低、精密度和准确度高、分析速度快等优点。

Determination of heavy metals in petrochemical wastewater by inductively coupled plasma-optical emission spectrometry method

The method for determination of heavy metals （As，Cd，Cr，Cu，Zn，Pb，Mn）in petrochemical wastewater was established by inductively coupled plasma-optical emission spectrometry （ICP-OES）after heated and decomposed with nitric acid. The working parameters of instrument were optimized，the linear regression equations were acquired，and the method was evaluated. The optimum working parameters of instrument were as follows：radio-frequency power 1 150 W，atomizer flow 0.70 L/min and auxiliary gas flow 0.50 L/min. The correlation coefficients of linear regression equations of all the heavy metals elements were above 0.999 9，the detection limits were 0.000 18-0.007 00 mg/L，the relative standard deviations were 0.1%-2.0% and the recoveries of standard addition were 96.3%-102.2%. This method had many advantages，such as good linear relationship，low detection limit，high accuracy and precision and quick analysis.