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KMID : 1156220190450020173
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Journal of Environmental Health Sciences
2019 Volume.45 No. 2 p.173 ~ p.185
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Enhancement of Occupational Exposure Assessment in Korea through the Evaluation of ECETOC TRA according to PROCs
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Kim Ki-Eun
Kim Jong-Woon
Jeon Hyun-Pyo
Kim Sang-Hun
Cheong Yeon-Seung
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Abstract
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Objectives: The objectives of this study are to evaluate the accuracy and precision of exposure model ECETOC TRA v.3.1 by comparing model predictions with repeated exposure measurements in Korean workplaces and to investigate the applicability of ECETOC TRA to Korean workplace exposure assessment in K-REACH.
Methods: Measured values and work conditions for 14 kinds of chemicals collected from exposure field surveys conducted at 10 companies in Korea were utilized for this study. All possible process categories (PROCs) considered to be relevant to each work process classification were selected and applied to ECETOC TRA as major determining parameters. In order to quantify the accuracy of the model, the lack of agreement (bias, relative bias, precision) was calculated and the risk ratios for each exposure situation between estimated and measured were also compared.
Results: The estimated values varied between five and 25 times according to the PROCs for all exposure situations (ESs) based on tasks/chemicals. The results showed that most of the estimated values were below the measured values, and just 13 of 53 tasks were above the measured values. The overall bias and precision were -2.91±1.62 with ECETOC TRA, and we found that ECETOC TRA showed a low level of conservatism when applied to Korean workplaces, similar to previous studies.
Conclusions: This study demonstrates that the existed PROC codes have limitations in fully covering various ESs in Korea. In order to improve the applicability of ECETOC TRA in K-REACH, the addition of new PROCs for Korean industries are necessary.
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KEYWORD
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ECETOC TRA, exposure model evaluation, K-REACH, occupational exposure assessment, PROCs
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