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Evaluation of the potential migration of hexavalent chromium and manganese during hot work activities at a fossil fuel generation facility.

机译：在化石燃料发电设施进行热加工活动期间评估六价铬和锰的潜在迁移。

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摘要

Hexavalent Chromium, also known as Cr(VI), is a known carcinogenic fume given off when welding or cutting is performed on stainless steel. In addition, other heavy metals are released through these processes; including lead, manganese (Mn), and molybdenum. In March 2006 the Occupational Safety and Health Administration (OSHA) implemented a new Cr(VI) standard, lowering the Permissible Exposure Limit (PEL) from 52 microg/m3 to 5 microg/m3.;In recent years, an emphasis has been made on an additional metal fume, manganese. Recent studies have shown that individuals exposed to high levels of Mn can develop neurological problems. The American Conference of Governmental Industrial Hygienists (ACGIH) proposed a change of the Mn Threshold Limit Value (TLV) in the 2010 edition of the ACGIH TLVs and BEIs from 0.2 mg/m 3 to 0.02 mg/m3.;This study evaluated the exposure to Cr(VI) and Mn associated with shielded metal arc welding (SMAW) on stainless steel and the migration of Cr(VI) and Mn in a fossil fuel generation facility. The facility is composed of eight different maintenance crews, which are responsible for the maintenance of a specific area of the facility. The crew evaluated is composed of twelve mechanics and works primarily with stainless steel material.;Results showed detectable concentrations that were below the occupational exposure limit of Cr(VI) in two of the personal breathing zone samples and detectable concentrations below the occupational exposure limit in one of the general area trials 10 feet away from the work area. Mn concentrations below the occupational exposure limit were detected in all four trials in the personal breathing zone samples and general area samples 10 feet away from the work area. None of the general area samples collected in the hallway or breakroom detected a measurable concentration of Cr(VI) or Mn. Wipe samples collected showed concentrations of Mn in all of the trials but Cr(VI) was not observed in any of the wipe samples.;While the study showed a lack of migration of Cr(VI) and Mn through the area air samples, Mn was detected in all of the breakroom wipe samples. It is postulated that migration occurred through the transfer of particles from the employees clothing to the breakroom. It is suggested the welders do utilize local exhaust ventilation and practice good hygiene. Welders are encouraged to wash their work clothes frequently, as well.
机译：六价铬，也称为Cr（VI），是在不锈钢上进行焊接或切割时释放出的已知致癌烟雾。此外，其他重金属也通过这些过程释放出来。包括铅，锰（Mn）和钼。 2006年3月，美国职业安全与健康管理局（OSHA）实施了新的Cr（VI）标准，将允许的暴露极限（PEL）从52微克/立方米降低到5微克/立方米。在另一种金属烟雾中，锰。最近的研究表明，暴露于高水平锰的个体会出现神经系统问题。美国政府工业卫生学家会议（ACGIH）提出将2010年版ACGIH TLV和BEI的锰阈值（TLV）从0.2 mg / m 3更改为0.02 mg / m3。 Cr（VI）和Mn与不锈钢上的屏蔽金属电弧焊（SMAW）有关，以及Cr（VI）和Mn在化石燃料发电设施中的迁移。该设施由八名不同的维护人员组成，负责维护设施的特定区域。被评估的工作人员由十二名机械师组成，主要使用不锈钢材料。结果显示，在两个个人呼吸区样本中可检测到的浓度低于Cr（VI）的职业暴露极限，而在18岁以下的可检测到的浓度低于职业呼吸极限。距工作区10英尺的一般区域试验之一。在所有四项试验中，在个人呼吸区样本和距工作区域10英尺的一般区域样本中均检测到低于职业接触限值的Mn浓度。在走廊或休息室中收集的所有常规区域样品均未检测到可测量的Cr（VI）或Mn浓度。收集的擦拭样品在所有试验中均显示出Mn的浓度，但在任何擦拭样品中均未观察到Cr（VI）。虽然研究表明Cr（VI）和Mn在整个空气样品中缺乏迁移在所有的休息室擦拭样品中均检测到。据推测，迁移是通过将颗粒从员工的衣服转移到休息室而发生的。建议焊工使用局部排气通风并保持良好的卫生习惯。鼓励焊工经常洗工作服。

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  • 作者

    Anderson, Trevin John.;

  • 作者单位

    Montana Tech of The University of Montana.;

  • 授予单位 Montana Tech of The University of Montana.;
  • 学科 Engineering Industrial.;Health Sciences Occupational Health and Safety.
  • 学位 M.S.
  • 年度 2013
  • 页码 74 p.
  • 总页数 74
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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