应用电感耦合等离子体原子发射光谱法测定汽油中铁、锰和铅的含量.对分析线选择、溶剂和内标等试验条件进行了研究.选择波长为238.204,257.610及224.688 nm 3条谱线依次作为测定铁、锰和铅的分析线,测得3种元素的检出限(3δ)依次为0.09,0.05及0.58 mg·L-1.应用此法测定了汽油中3种元素的含量,回收率在96.2%~100.2%,100.3%~106.9%,97.5%~101.2%之间,相对标准偏差(n=6)小于3.5%.与原子吸收光谱法比较,电感耦合等离子体原子发射光谱法测定结果的精密度优于原子吸收光谱法.

An ICP-AES method for the determination of Fe,Mn,and Pb in petrol was proposed. Analytical conditions,including choice of analytical sepctral lines,solvent and internal standards,were studied. Wavelengths of 238.204,257.610 and 224.688 nm were selected as analytical lines for the determination of Fe,Mn and Pb respectively. Detection limits (3δ) of Fe,Mn and Pb found were 0.09,0.05 and 0.58 mg·L-1 respectively. The proposed method was used in determination of the 3 elements in petrol,giving values of recovery in the ranges of 96.2%-100.2%,100.3%-106.9%,97.5%-101.2% respectively,and values of RSD′s (n=5) less than 3.5%. It was shown that precision of analytical results obtained by the proposed method was better than those obtained by AAS.