碱片-离子色谱法测定硫酸盐化速率影响因素

采用碱片-离子色谱法测定空气的硫酸盐化速率,方法在硫酸盐质量浓度为1.00~20.0 mg/L范围内线性良好(r≥0.999 0);碱片剪碎或不剪碎对空白碱片中硫酸根离子质量浓度的测定无明显影响,且高低两种加标浓度的回收率均在80.0%~120%之间;对于碱片实际样品,碱片剪碎更有利于硫酸根离子的快速溶出;随浸泡时间的延长,碱片中溶出的硫酸根离子质量浓度呈上升趋势,7 h硫酸根离子基本溶出完全,从保证结果质量和节省时间的角度考虑,确定最佳浸泡时间为3.5 h,建议碱片全部采取剪碎处理。

Preliminary Investigation of Influence Factors in the Determination of Sulfation Rate by Alkaline Sampling Paper Coupled with Ion Chromatography

The determination of sulfation rate in the air usingalkaline sampling paper coupled with ion chromatography was investiga-ted.The results showed that a good linear relationship of sulfatewas obtained (r≥0.999 0) in the mass concentration range of 1.00~20.0 mg/L.The effect of cutting up or not was not obvious for the blank alkaline sampling paper.The recoveries of sulfate were between 80.0%~120%at high and low spiked levels.Cutting up mode was more suitable for real samples, which was good for the rapid and sufficientrelease of sulfate.The mass concentration of sulfate increased gradually with increasing the immersion time.When the alkaline sampling paper was immersed 7 h, the sulfate could be considered dissolved completely.In the considerations of data quality and saving time, it was suggested that both blank and real alkaline sampling papers were cut up, and determined after im-mersed for 3.5 h.