Laboratory evaluation of pressure differential-based respirable dust detector tube.
Laboratory evaluation of pressure differential-based respirable dust detector tube.
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基于压差的呼吸性粉尘检测管的实验室评估。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Page
中科院分区：
文献类型：
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作者：
J. Volkwein;A. Schoeneman;S. Page
职业性粉尘暴露评估是减少有害粉尘浓度暴露的第一步。研制了一种新型的呼吸性粉尘采样器，并在实验室中与个人重力采样器进行了比较。新的采样器将过滤器背压与质量累积相关联，以提供累积暴露的轮班中期和轮班结束测定。采样器使用小型低流速泵通过小型检测管抽取粉尘，检测管包含多孔聚氨酯泡沫可吸入分类部分和收集可吸入粉尘的玻璃纤维过滤器。六种不同的煤尘在实验室粉尘室中雾化，共获得119个三份观测结果。对于个别煤种，相关系数在0.87和0.97之间。两种方法的精密度相似，个人采样器的相对标准偏差为12%，新检测器方法为14%。对于测试的所有煤炭类型，数据最好用幂函数描述，其中Delta P = 1.43质量（0.85），相关系数为0.73。该方法在更高的粉尘负载下变得更准确，使得质量负载大于2 mg/m3当量浓度的所有实验室数据都落在幂函数的+/-25%范围内。目前正在实地条件下对该方法进行评估。
Assessment of exposure to occupational dusts is a first step in reducing exposures to harmful dust concentrations. A new type of respirable dust sampler was developed and compared side-by-side to personal gravimetric samplers in the laboratory. The new sampler correlates filter back pressure with mass accumulation to provide mid-shift- and end-of-shift determinations of cumulative exposure. The sampler uses a small low flow rate pump to draw dust through a small detector tube that contains a porous urethane foam respirable classification section and glass fiber filter that collects respirable dust. Six different coal dusts were aerosolized in a laboratory dust chamber and a total of 119 triplicate observations were obtained. For individual coal types, the correlation coefficients were between 0.87 and 0.97. The precision of the two methods was similar, with the percent relative standard deviation of the personal samplers of 12 percent and the new detector method of 14 percent. For all coal types tested th data were best described by a power function where delta P = 1.43 mass (0.85), with a correlation coefficient of 0.73. The method becomes more accurate at higher dust loadings such that all laboratory data with mass loadings greater than an equivalent concentration of 2 mg/m3 fall within +/- 25 percent of the power function. Assessment of the method under field conditions is in progress.