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首页> 外文期刊>Environmental Science & Technology >Positive Artifact Sulfate Formation from SO_2 Adsorption in the Silica Gel Sampler Used in NIOSH Method 7903
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Positive Artifact Sulfate Formation from SO_2 Adsorption in the Silica Gel Sampler Used in NIOSH Method 7903

机译：NIOSH方法7903中使用的硅胶进样器中SO_2吸附产生的正伪像硫酸盐

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摘要

Niosh Method 7903, which uses one section of glass fiber filter and two sections of silica gel, has been developed to determine the total concentrations of acid mists in workplace air, although certain gases are suspected to cause interference. In this study, experiments were performed to investigate the roles of sulfur(Ⅳ) oxidation and sulfur dioxide (SO_2) adsorption in causing artifacts in sulfuric acid measurement. First, sulfur(Ⅳ) oxidation, under four combinations of water bath temperature and Na_2CO_3 solution concentration, was examined to investigate the effect of the extraction process of NIOSH Method 7903. It was shown that sulfur(Ⅳ) oxidation to form sulfate could reach 100% within just 2-3 min, following the extraction process of NIOSH Method 7903. The results demonstrate that, using the procedure, SO_2 adsorbed by the silica gel and the glass fiber filter easily yields artifact sulfate. Sulfur dioxide adsorption under various flow rates, SO_2 concentrations, and sampling times was also investigated. The experimental data were fitted to a deactivation model to determine the adsorption rate constant and the deactivation rate constant. The model can serve as a tool for estimating the artifact sulfate if the SO_2 concentration is available.
机译：已开发出使用一部分玻璃纤维过滤器和两部分硅胶的Niosh方法7903，以确定工作场所空气中酸雾的总浓度，尽管怀疑某些气体会造成干扰。在这项研究中，进行了实验，以研究硫（Ⅳ）氧化和二氧化硫（SO_2）吸附在硫酸测量中引起伪影的作用。首先，在水浴温度和Na_2CO_3溶液浓度的四种组合下，研究了硫（Ⅳ）的氧化，以研究NIOSH方法7903的提取工艺的效果。结果表明，硫（Ⅳ）氧化形成硫酸盐的方法可以达到100按照NIOSH方法7903的提取过程，在2-3分钟内达到％。结果表明，使用该程序，硅胶和玻璃纤维过滤器吸附的SO_2容易产生伪影硫酸盐。还研究了在各种流速，SO_2浓度和采样时间下二氧化硫的吸附情况。将实验数据拟合到失活模型以确定吸附速率常数和失活速率常数。如果可用SO_2浓度，则该模型可以用作估算人为硫酸盐的工具。

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