原子吸收法测定土壤中铅的方法

通过湿法消解土壤样品,利用石墨炉原子吸收分光光度法(GAAS)和火焰原子吸收分光光度法(FAAS)测定不同土壤样品中铅的含量,以验证2种方法的有效性并加以对比。实验结果表明:2种方法均满足土壤中铅含量的测定要求,测定的标准土样含量均在标准值的不确定度范围内,GAAS方法测定结果更接近保证值。二者的相对标准偏差(RSD)值均低于1.5%,FAAS方法的精密度更高,且具有快速简单等优势。

Comparison of Analytical Methods of Lead Content Determination in Soil

Through wet digestion of soil samples,the graphite furnace atomic absorption spectrophotometry(GAAS)and flame atomic absorption spectrophotometry(FAAS)were used to determine the lead content in different soil samples to verify the effectiveness of the two methods and to compare with these two motheds.As show by testing results:both methods meet the requirements for the determination of lead content in soil and all the values were within the limits of uncertainty values,the values measured by GAAS were nearer to the truth values.The relative standard deviation of the measured values(RSD)were less than 1.5%.In aspects of simplicity in operation and rapidity in analysis,FAAS has its superiorities.