An Evaluation of On-Tool Shrouds for Controlling Respirable Crystalline Silica in Restoration Stone Work
An Evaluation of On-Tool Shrouds for Controlling Respirable Crystalline Silica in Restoration Stone Work
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DOI：
10.1093/annhyg/meu069
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发表时间：
2014-11-01
影响因子：
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通讯作者：
McGowan, Padraic
中科院分区：
文献类型：
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作者：
Healy, Catherine B.;Coggins, Marie A.;McGowan, Padraic
目的：用5英寸角磨机研磨砂岩的任务是接触可吸入结晶二氧化硅（RCS）的主要来源，已知会导致使用这些材料的工人患矽肺和肺癌等疾病。护罩可以是用于该任务的合适的工程控制。本研究的目的是评估的有效性，四个市售的brids在减少呼吸性粉尘和RCS水平的任务期间使用的工具和配件的典型的修复stonework.Methods的砂岩研磨砂岩的任务，5英寸角磨机，配备不同的砂轮，进行了三个试验在修复石砌体网站。光度和RCS数据收集时，5英寸的磨床，配备了不同的砂轮，被用来研磨砂岩和没有护罩。对于每个无护罩和有护罩的组合，共收集了24个短期样本。工人反馈的实用性，每个护罩evaluated.Results：呼吸性粉尘浓度和RCS都显着降低（P < 0.001）时，磨床配备了护罩相比，磨床没有护罩。使用护罩研磨时测得的总几何平均（GM）光度可吸入粉尘水平为0.5 mg m（-3），与不使用护罩研磨（7.1 mg m（-3））相比减少了92%。通过使用护罩，GM RCS的总浓度降低了99%。GM光度曝光水平最高时，使用喜利得5英寸金刚石研磨杯和金刚石涡轮杯和最低时，使用Cordos研磨point.Conclusions：浓度的呼吸性粉尘和RCS可以显着降低使用市售的Cordos，而研磨砂岩与5英寸角磨机修复石材。短期光度可吸入粉尘和RCS测量收集和没有护罩表明，粉尘和RCS浓度减少90%和99%之间。需要补充接触控制，如呼吸防护设备，以减少工人8小时时间加权平均RCS接触，低于职业接触限值科学委员会建议的职业接触限值0.05 mg m（-3）和美国政府工业卫生学家会议阈值限值0.025 mg m（-3）。
Objectives: The task of grinding sandstone with a 5-inch angle grinder is a major source of exposure to respirable crystalline silica (RCS), known to cause diseases such as silicosis and lung cancer among workers who work with these materials. A shroud may be a suitable engineering control for this task. The objectives of this study were to evaluate the effectiveness of four commercially available shrouds at reducing respirable dust and RCS levels during the task of grinding sandstone using tools and accessories typical of restoration stone work.Methods: The task of grinding sandstone with a 5-inch angle grinder, equipped with different grinding wheels, was carried out over three trials at a restoration stone masonry site. Photometric and RCS data were collected when a 5-inch grinder, equipped with different grinding wheels, was used to grind sandstone with and without a shroud. A total of 24 short duration samples were collected for each no shroud and with shroud combination. Worker feedback on the practicalities of each shroud evaluated was also collected.Results: Respirable dust concentrations and RCS were both significantly lower (P < 0.001) when the grinders were equipped with a shroud compared with grinders without a shroud. Total geometric mean (GM) photometric respirable dust levels measured when grinding with a shroud were 0.5 mg m(-3), a reduction of 92% compared to grinding without a shroud (7.1 mg m(-3)). The overall GM RCS concentrations were reduced by the use of a shroud by 99%. GM photometric exposure levels were highest when using the Hilti 5-inch diamond grinding cup and Diamond turbo cup and lowest when using the Corundum grinding point.Conclusions: Concentrations of respirable dust and RCS can be significantly reduced by using commercially available shrouds while grinding sandstone with a 5-inch angle grinder in restoration stonework. The short-term photometric respirable dust and RCS measurements collected with and without a shroud indicate that dust and RCS concentrations are reduced by between 90 and 99%. Supplemental exposure controls such as respiratory protective equipment would be required to reduce worker 8-h time-weighted average RCS exposure to below the Scientific Committee on Occupational Exposure Limits recommended occupational exposure limit value of 0.05 mg m(-3) and the American Conference of Governmental Industrial Hygienists threshold limit value of 0.025 mg m(-3).