分光光度法快速测定无铅汽油中痕量铅

Rapid Determination of Trace Lead in Unleaded Gasoline by Spectrophotometry

研究了无铅汽油中痕量铅的快速测定方法。在 490nm处测定经碘和四乙基氯化铵的氯仿溶液处理过的汽油与 4-( 2 -吡啶偶氮 )间苯二酚二钠盐反应生成的络合物 ,对测定条件进行了系统的考察。Pb质量浓度的线性范围为2 6 5～ 2 6 5mg/L ,方法的相对标准偏差小于 5 0 % ,实际试样测定结果的相对误差小于 5 3 %。本方法操作简便、快速 。

Trace lead in unleaded gasoline was determined by measuring its PAR complex at 490 nm. Determination conditions were investigated in detail.Linear range is 2 65 mg Pb/L～26 5 mg Pb/L. The relative standard deviation of analytical results in unleaded gasoline samples is less than 5 0%, and relative error is less than 5 3%. This method is simple, rapid and accurate for determination of trace lead in unleaded gasoline.