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Evaluating the use of a field-based silica monitoring approach with dust from copper mines.
J Occup Environ Hyg. 2018 10; 15(10):732-742.JO

Abstract

Monitoring worker exposure to respirable crystalline silica in dusty environments is an important part of a proactive health and safety program. This is the case for surface copper mines in Arizona and New Mexico. The spatial and temporal variability of respirable dust and crystalline silica concentrations in those mines, coupled with the time lapse in obtaining crystalline silica analysis results from accredited laboratories, present a challenge for an effective exposure monitoring approach and the resulting intervention strategies. The National Institute for Occupational Safety and Health (NIOSH) is developing a novel approach to be used at a mine site for the quantification of crystalline silica in respirable dust samples collected with traditional sampling techniques. The non-destructive analysis is carried out using a portable Fourier transform infrared spectroscopy (FTIR) unit. In this study, respirable dust samples were collected over two visits to each of five copper mines, for a total of 10 datasets. The silica in each respirable dust sample was estimated by analyzing the sample with the portable FTIR unit. The quality of the estimation was assessed using the results of the NIOSH 7500 method on the same samples. The confounding effect of other minerals present in the respirable dust in the mines was also assessed, and two quantification approaches were investigated to address it: a sector-specific and a mine-specific approach. The results showed that the sector-specific approach is not effective due to the high variability of relative composition of the minerals among mines. For this approach the combined average relative difference was -13% (-17.6%, -8.9% CI). When using the mine-specific quantification approach, the average relative difference was as low as 2.8% (-3.7%, 9.3% CI); however, this approach was still affected by the variable relative composition of the minerals in the dust in each mine. The use of a multivariate approach on the analysis of each sample was proposed as the next step to achieve consistent low relative differences. This study demonstrates the potential of using a portable FTIR for estimation of crystalline silica in respirable dust samples for in-field exposure monitoring.

Authors+Show Affiliations

a Pittsburgh Mining Research Division, Dust Control, Ventilation and Toxic Substances Branch , National Institute for Occupational Safety and Health , Pittsburgh , Pennsylvania.a Pittsburgh Mining Research Division, Dust Control, Ventilation and Toxic Substances Branch , National Institute for Occupational Safety and Health , Pittsburgh , Pennsylvania.b Embry-Riddle Aeronautical University , Prescot , Arizona.c Freeport-McMoRan Inc. , Phoenix , Arizona.

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

29985785

Citation

Cauda, Emanuele, et al. "Evaluating the Use of a Field-based Silica Monitoring Approach With Dust From Copper Mines." Journal of Occupational and Environmental Hygiene, vol. 15, no. 10, 2018, pp. 732-742.
Cauda E, Chubb L, Reed R, et al. Evaluating the use of a field-based silica monitoring approach with dust from copper mines. J Occup Environ Hyg. 2018;15(10):732-742.
Cauda, E., Chubb, L., Reed, R., & Stepp, R. (2018). Evaluating the use of a field-based silica monitoring approach with dust from copper mines. Journal of Occupational and Environmental Hygiene, 15(10), 732-742. https://doi.org/10.1080/15459624.2018.1495333
Cauda E, et al. Evaluating the Use of a Field-based Silica Monitoring Approach With Dust From Copper Mines. J Occup Environ Hyg. 2018;15(10):732-742. PubMed PMID: 29985785.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluating the use of a field-based silica monitoring approach with dust from copper mines. AU - Cauda,Emanuele, AU - Chubb,Lauren, AU - Reed,Rustin, AU - Stepp,Robert, PY - 2018/7/10/pubmed PY - 2019/10/23/medline PY - 2018/7/10/entrez KW - DoF-FTIR KW - field-based monitoring KW - mining KW - respirable crystalline silica SP - 732 EP - 742 JF - Journal of occupational and environmental hygiene JO - J Occup Environ Hyg VL - 15 IS - 10 N2 - Monitoring worker exposure to respirable crystalline silica in dusty environments is an important part of a proactive health and safety program. This is the case for surface copper mines in Arizona and New Mexico. The spatial and temporal variability of respirable dust and crystalline silica concentrations in those mines, coupled with the time lapse in obtaining crystalline silica analysis results from accredited laboratories, present a challenge for an effective exposure monitoring approach and the resulting intervention strategies. The National Institute for Occupational Safety and Health (NIOSH) is developing a novel approach to be used at a mine site for the quantification of crystalline silica in respirable dust samples collected with traditional sampling techniques. The non-destructive analysis is carried out using a portable Fourier transform infrared spectroscopy (FTIR) unit. In this study, respirable dust samples were collected over two visits to each of five copper mines, for a total of 10 datasets. The silica in each respirable dust sample was estimated by analyzing the sample with the portable FTIR unit. The quality of the estimation was assessed using the results of the NIOSH 7500 method on the same samples. The confounding effect of other minerals present in the respirable dust in the mines was also assessed, and two quantification approaches were investigated to address it: a sector-specific and a mine-specific approach. The results showed that the sector-specific approach is not effective due to the high variability of relative composition of the minerals among mines. For this approach the combined average relative difference was -13% (-17.6%, -8.9% CI). When using the mine-specific quantification approach, the average relative difference was as low as 2.8% (-3.7%, 9.3% CI); however, this approach was still affected by the variable relative composition of the minerals in the dust in each mine. The use of a multivariate approach on the analysis of each sample was proposed as the next step to achieve consistent low relative differences. This study demonstrates the potential of using a portable FTIR for estimation of crystalline silica in respirable dust samples for in-field exposure monitoring. SN - 1545-9632 UR - https://www.unboundmedicine.com/medline/citation/29985785/Evaluating_the_use_of_a_field_based_silica_monitoring_approach_with_dust_from_copper_mines_ DB - PRIME DP - Unbound Medicine ER -