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KMID : 1039220230330010006
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Journal of Korean Society of Occupational and Environmental Hygiene
2023 Volume.33 No. 1 p.6 ~ p.11
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Analysis of Components and Oxygen Consumption Rate for Zinc Concentrates in a Closed Chamber
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Park Hae-Dong
Hwang Eun-Song
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Abstract
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Objective: This study was conducted to identify the cause of suffocation accident.
Methods: We analyzed the components of zinc concentrates by ICP-OES (inductively coupled plasma optical emission spectroscopy) and tested the oxygen consumption by zinc concentrates in a 13.2-liter closed chamber.
Results: Zinc, sulfur and iron were the main components of the four types of zinc concentrates, and accounted for 76~89% by weight. Zinc concentrates (0.5 or 0.927 kg) depleted the oxygen concentration from 20.9% to 7.4~18.9% during seven days. The rate of oxygen consumption was in the range of 3.0~11.0 mM/day?kg-sample at 21~24℃ and around 95% of free air space within the closed chamber.
Conclusion: Since zinc concentrate consumes oxygen in a confined space, measures should be taken to prevent suffocation accident (such as ventilation and monitoring of oxygen concentration).
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KEYWORD
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oxygen consumption, zinc concentrate, confined space, suffocation accident
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