Vinnikov Denis, Tulekov Zhangir
Faculty of Medicine and Healthcare, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Department of Biochemistry, Peoples' Friendship University of Russia, Moscow, Russian Federation.
Occup Environ Med. 2020 Nov 23. doi: 10.1136/oemed-2020-106883.
Little is known regarding the metal working subprocesses that determine exposures in the workplace primarily because their segregation from the main process is rather difficult in real-life occupational settings. The present study aimed to identify the subprocesses in a metalworks plant with high personal exposure to particulate matter (PM metal aerosol in order to plan future risk reduction interventions.
A total of eighty 8-hour PM metal aerosol samples from the breathing zone of four workers in each of four major operations (plasma cutting, machine operating, assembling and welding) were collected in a metalwork plant in Almaty in January to June 2020. Minimal, maximal, time-weighted average PM metal aerosol mass concentrations were recorded with TSI SidePak AM520 personal aerosol and analysed using analysis of variance (ANOVA) after normalisation.
The overall sampling time was 640 hours. Maximal 1 min and geometric mean PM concentrations were 8.551 and 1.7268 mg/m in plasma cutting; 4.844 and 0.9343 mg/m in machine operating; 2.993 and 0.6898 mg/m in assembling; and 2.848 and 0.4903 mg/m in welding. Using a Tukey-Kramer test after a one-way ANOVA, plasma cutting concentrations were significantly higher compared with all other operations (F-ratio 29.6, p<0.001). The fold-range containing 95% of the total variability (R) from all samples was 12.5.
The highest PM concentrations were found in plasma cutting, potentially elevating the risk of systemic inflammatory effects.
关于决定工作场所暴露的金属加工子过程，我们了解甚少，主要是因为在实际职业环境中，将它们与主要过程隔离开来相当困难。本研究旨在确定一家金属加工厂中个人颗粒物（PM金属气溶胶）暴露水平较高的子过程，以便规划未来的风险降低干预措施。
2020年1月至6月，在阿拉木图的一家金属加工厂，从四个主要操作（等离子切割、机器操作、组装和焊接）中每个操作的四名工人的呼吸区总共采集了80个8小时的PM金属气溶胶样本。使用TSI SidePak AM520个人气溶胶仪记录最小、最大和时间加权平均PM金属气溶胶质量浓度，并在归一化后使用方差分析（ANOVA）进行分析。
总采样时间为640小时。等离子切割中最大1分钟和几何平均PM浓度分别为8.551和1.7268毫克/立方米；机器操作中为4.844和0.9343毫克/立方米；组装中为2.993和0.6898毫克/立方米；焊接中为2.848和0.4903毫克/立方米。在单向方差分析后使用Tukey-Kramer检验，与所有其他操作相比，等离子切割浓度显著更高（F比率29.6，p<0.001）。所有样本中包含95%总变异性（R）的倍数范围为12.5。
等离子切割中PM浓度最高，可能会增加全身炎症反应的风险。
