有机进样-电感耦合等离子体发射光谱法测定汽油中的磷含量

Determination of Phosphorus Content in Gasoline by Organic Direct Injection ICP-AES

采用有机进样-电感耦合等离子体发射光谱法测定汽油中的磷含量。以异辛烷为稀释剂,按照m（汽油）∶m（异辛烷）=1∶3加以稀释后直接进入ICP-AES（电感耦合等离子体发射光谱）仪测定。结果表明,该方法工作标准曲线在0~10 mg/kg（即稀释前磷含量在0~40 mg/kg）范围内线性关系良好,r=0.999 2,方法检出限为0.156 mg/kg,相对标准偏差〈5.0%,回收率在96.3%~105.8%之间。

An organic direct injection-inductively coupled plasma atomic emission spectrometry was established for the analysis of phosphorus contents in gasoline. Isooctane as the diluent and the sample was diluted according to gasoline / isooctane（ mass ratio）1 /3 and determined by ICP-AES. The results showed that the standard curve of the method had a good linear relationship in the range of 0 ~ 10 mg / kg（ namely the phosphorus contents was in the range of 0 ~ 40 mg / kg before the dilution）,the linear correlation coefficient was 0. 999 2; the detection limit by this method was 0. 156 mg / kg and the recovery was 96. 3% ~ 105. 8% with relative standard deviation was less than 5. 0%.