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研究了快速测定无铅汽油中痕量铅的方法。在 4 90 nm处 ,测定经氯化四乙胺的氯仿溶液和碘溶液处理过的汽油与 PAR· 2 Na反应生成的络合物。线性范围为 0～ 2 5.2μg/m L,回归方程为 A=0 .0 1 2 34 c+ 0 .4 1 88,相关系数为0 .9992 ,检出限为 0 .2 6 μg/m L。本方法操作简便 ,测定一次可在 2 0 min内完成。
A rapid method for the determination of trace lead in unleaded gasoline was studied. At 490 nm, the complex formed by the reaction of PAR · 2 Na with gasoline treated with a solution of tetraethylammonium chloride in chloroform and an iodine solution was determined. The linear range was 0 ~ 2 5.2μg / m L, the regression equation was A = 0.01234c +0.4188, the correlation coefficient was 0.9992, the detection limit was 0.226μg / m L. The method is easy to operate and can be completed within 20 min.