硫酸盐化速率样品在碱片上的扩散分析

The Diffusion Analysis of Alkaline Sampling Paper for Oxidation Rate from Sulfur Dioxide to Sulfate Determination

选择采样期中不同降雨天数的碱片，测定余边的硫酸盐化速率含量，其结果为：采样期全月无雨时，余边上均未检出硫酸盐；半月以上至全月有雨时检出率为１００％，检出量占样品量的２７％～１５９％。经扩散试验，查清了余边上的硫酸盐主要是有效面积上采集的样品扩散所致，提出了相应的修正方法。

The alkaline sampling papers have been selected and classificated according to raining days in a month and determined the sulfate in unexposed margin of them separately. The results show that no sulfate has been detected in no raining day on the margins of alkaline sampling papers. If raining days over 15 even 30 days in a month, the sulfate has on 100 % margins of alkaline sampling papers. The quatity of sulfate on the margin of alkaline sampling paper is 2.7%-15.9 % of total sampling paper. The result of diffusion test shows the sulfate on the margin of alkaline sampling paper mainly caused by the one on effective area. A modify method has been established for solving this problem.