Abstract
Objective
Platinum Group Metals (PGMs) are mined and refined together and have the potential to elicit adverse respiratory and skin health effects. The aim of this study was to investigate the simultaneous skin and respiratory exposure of precious metals refinery workers to all six soluble PGMs.
Methods
The simultaneous skin and respiratory exposure to soluble PGMs of forty workers at two precious metals refineries were measured over two consecutive work shifts using Ghostwipes™ and Methods for the Determination of Hazardous Substances method 46/2. Skin exposure was measured on the palm, wrist, neck, and forehead of workers.
Results
The highest geometric mean (GM) skin exposure (average of palm, wrist, neck and forehead) was found for soluble Pt (0.008 µg/cm2) [95% confidence interval (CI) 0.005–0.013], followed, in order, by Rh, Ir, Pd, Ru, and Os. Significantly higher concentrations of soluble PGMs were found on the palm and wrist compared to the neck and forehead (p < 0.0001). The highest GM respiratory exposure was found for soluble Pd (0.342 µg/m3 [95% CI 0.163–0.718]) followed, in order, by Pt, Rh, Ru, Ir, and Os. Skin exposure to all soluble PGMs was positively correlated with respiratory exposure (r = 0.466–0.702).
Conclusion
This is the first study to report skin exposure to all six soluble PGMs. Precious metals refinery workers were exposed to quantifiable concentrations of soluble PGMs via both the skin and inhalation. Exposure via both routes occurred together and control measures should be aimed at reducing both skin and respiratory exposure.
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References
Bos PM, Brouwer DH, Stevenson H (1998) Proposal for the assessment of quantitative dermal exposure limits in occupational environments: Part 1. Development of a concept to derive a quantitative dermal occupational exposure limit. Occup Enviro Med 55:795–804
Brouwer DH, Boeniger MF, Van Hemmen J (2000) Hand wash and manual skin wipes. Ann Occup Hyg 44:501–510
Cherrie JW, Semple S, Christopher Y, Saleem A, Hughson GW, Philips A (2006) How important is inadvertent ingestion of hazardous substances at work? Ann Occup Hyg 50:693–704
Cristaudo A, Picardo M, Petrucci F, Forte G, Violante N, Senofante O, Alimonti A, Sera A (2007) Clinical and allergological biomonitoring of occupational hypersensitivity to Pt group elements. Anal Lett 40:3343–3359
Department of Mineral Resources (DMR) (2002) Chapter 22 Schedules. In: Regulations under the mine health and safety act, 1996. http://www.dmr.gov.za/LinkClick.aspx?fileticket=6dNpvPLSqiU%3D&portalid=0. Accessed 4 June 2020
DOL (2017) Hazardous chemical substances regulations, 1995. In: Department of Labour, Occupational Health and Safety Act and Regulations (Act 85 of 1993) 18th edn. Juta and Company (Pty) Ltd, Cape Town pp 346–428. ISBN 978 1 48511 894 7
Du Plessis JL, Eloff FC, Badenhorst CJ, Olivier J, Laubscher PJ, Van Aarde MN, Franken A (2010) Assessment of dermal exposure and skin condition of workers exposed to nickel at a South African base metal refinery. Ann Occup Hyg 54:23–30
Ellis SM, Steyn HS (2003) Practical significance (effect sizes) versus or in combination with statistical significance (p-values). Manag Dyn 12:51–53
Fothergill SJR, Withers DF, Clements FS (1945) Determination of traces of platinum and palladium in the atmosphere of a platinum refinery. Occup Environ Med 2:99–101
Franken A, Eloff FC, Du Plessis J, Badenhorst CJ, Jordaan A, Du Plessis JL (2014) In vitro permeation of platinum and rhodium through Caucasian skin. Toxicol In Vitro 208:1396–1401
Franken A, Eloff FC, Du Plessis J, Du Plessis JL (2015a) In vitro permeation of metals through human skin: a review and recommendations. Chem Res Toxicol 28:2237–2249
Franken A, Eloff FC, Du Plessis J, Badenhorst CJ, Du Plessis JL (2015b) In vitro permeation of Pt through African and Caucasian skin. Toxicol Lett 232:566–572
Ganser GH, Hewett P (2010) An accurate substitution method for analysing censored data. J Occup Environ Hyg 7:233–244
González-Ruiz L, Vergara De Caso E, Peña-Sánchez R, Silvestre-Salvador JF (2019) Delayed hypersensitivity to palladium dichloride: 15-year retrospective study in a skin allergy unit. Contact Dermat 81:249–253
Gorman Ng M, MacCalman L, Semple S, van Tongeren M (2017) Field measurements of inadvertent ingestion exposure to metals. Ann Work Expo Health 61:097–1107
Health and Safety Executive (HSE) (1996) Methods for the determination of hazardous substances (MDHS) 46/2: Platinum metal and soluble platinum compounds in air. Laboratory method using electrothermal atomic absorption spectrometry or inductively coupled plasma-mass spectrometry. Health and Safety Executive, Suffolk, UK. ISBN 0 717 61306 2
Heederik D, Jacobs J, Samadi S, Van Rooy F, Portengen L, Houba R (2016) Exposure-response analyses for platinum salt–exposed workers and sensitization: a retrospective cohort study among newly exposed workers using routinely collected surveillance data. J Allergy Clin Immunol 137:922–929
Hunter D, Milton R, Perry KMA (1945) Asthma caused by complex salts of platinum. Br J Ind Med 2:92–98
International Platinum Group Metals Association (IPA) (2017a) Chapter 5 Toxicokinetics of Platinum and other Platinum Group Metals. https://ipa-news.de/assets/sustainability/IPA_Guidance/Chapter%205_PGM_Guide.pdf. Accessed 18 May 2020
International Platinum Group Metals Association (IPA) (2017b) Chapter 6. Toxicity of Platinum and Platinum Compounds (with summaries for other PGMs). https://ipa-news.de/assets/sustainability/IPA_Guidance/Chapter%206_PGM_Guide.pdf. Accessed 18 May 2020
International Platinum Group Metals Association (IPA) (2017c) Chapter 9. Control Measures and Management Systems. https://ipa-news.de/assets/sustainability/IPA_Guidance/Chapter%209_PGM_Guide.pdf. Accessed 18 May 2020
Kielhorn J, Melber C, Keller D, Mangelsdorf I (2002) Palladium–a review of exposure and effects to human health. Int J Hyg Envir Heal 205:417–432
Larese Filon F, Mauro M, Adami G, Bovenzi M, Crosera M (2015) Nanoparticles skin absorption: new aspects for a safety profile evaluation. Regul Toxicol Pharmacol 72:310–322
Linde SJL, Franken A, du Plessis JL (2017) Occupational respiratory exposure to platinum group metals: a review and recommendations. Chem Res Toxicol 30:1778–1790
Linde SJL, Franken A, Du Plessis JL (2018) Urinary excretion of platinum (Pt) following skin and respiratory exposure to soluble Pt at South African precious metals refineries. Int J Hyg Envir Heal 221:868–875
Matthey J (2020) PGM Market Report February 2020. https://matthey.com/-/media/files/press-releases/pgm-market-report-february-2020.pdf. Accessed 18 May 2020
Maynard AD, Northage C, Hemingway M, Bradley SD (1997) Measurement of short-term exposure to airborne soluble platinum in the platinum industry. Ann Occup Hyg 41:77–94
Merget R, Sander I, van Kampen V, Raulf-Heimsoth M, Ulmer HM, Kulzer R, Bruening T (2010) Occupational immediate-type asthma and rhinitis due to rhodium salts. Am J Ind Med 53:42–46
Merget R, Pham N, Schmidtke M, Casjens S, Van Kampen V, Sander I, Hagemeyer O, Sucker K, Raulf M, Brüning T (2017) Medical surveillance and long-term prognosis of occupational allergy due to platinum salts. Int Arch Environ Health 90:73–81
Minerals Council South Africa (2020) Facts and Figures pocketbook 2019. file:///C:/Users/20686641/Downloads/facts-and-figures-pocketbook-2019-16-04-2020.pdf. Accessed 18 May 2020
Naylor CL, Davies B, Gopaldasani V (2020) Quantitative skin exposure assessment of metals: a systematic literature review of current approaches for risk assessment using the construction industry as an exposure scenario. Int Arch Occ Env Hea. https://doi.org/10.1007/s00420-020-01531-8
Occupational Safety and Health Administration (OSHA) (2002) Method number ID-125G: Metal and metalloid particulates in workplace atmosphere (ICP Analysis). Occupational Safety & Health Administration Technical Centre, Salt Lake City, Utah. https://www.osha.gov/dts/sltc/methods/inorganic/id125g/id125g.pdf. Accessed 19 May 2018
Paustenbach DJ (2000) The practice of exposure assessment: a state-of-the-art review. J Toxicol Environ Health B Crit Rev 3:179–291
Petrucci F, Violante N, Senofonte O, Cristaudo A, Di Gregorio M, Forte G, Alimonti A (2005) Biomonitoring of a worker population exposed to platinum dust in a catalyst production plant. Occup Environ Med 62:27–33
Phetla T, Muzenda E, Belaid M (2010) A study of the variables in the optimisation of a platinum precipitation process. World Acad Sci Eng Technol 45:248–254
Rosholm Comstedt L, Dahlin J, Bruze M, Åkesson A, Hindsén M, Pontén A, Isaksson M, Svedman C (2020) Prevalence of contact allergy to metals: nickel, palladium, and cobalt in Southern Sweden from 1995–2016. Contact Dermat 82:218–226
Schneider T, Cherrie JW, Vermeulen R, Kromhout H (2000) Dermal exposure assessment. Ann Occup Hyg 44:493–499
Seymour RJ, O’Farrelly J (2012) Platinum–group metals. In: Seidel A (eds) Kirk–Othmer encyclopaedia of chemical technology. Online Wiley and Sons Inc., New Jesey, pp 1–37. ISBN 978 047 123896 6
Sosiaali- ja terveysministeriön (2018) HTP-arvot 2018. Haitallisiksi tunnetut pitoisuudet, Social Affairs and Health Ministry. http://julkaisut.valtioneuvosto.fi/bitstream/handle/10024/160967/STM_09_2018_HTParvot_2018_web.pdf. Accessed 19 May 2020
Terrani I, Hofmeier KS, Bircher AJ (2020) Indium and iridium: two rare metals with a high rate of contact sensitization. Contact Dermat 83:94–98
Violante N, Petrucci F, Senofonte O, Cristaudo A, Di Gregorio M, Forte G, Alimonti A (2005) Assessment of workers’ exposure to palladium in a catalyst production plant. J Environ Monitor 7:463–468
Acknowledgements
We would like to thank the participants and management teams of the respective precious metals refineries for their support.
Funding
This work is based on the research financially supported by the National Research Foundation of South Africa (NRF) Grant no. 90562 and 105636.
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Linde, S.J.L., Franken, A. & du Plessis, J.L. Skin and respiratory exposure to platinum group metals at two South African precious metals refineries. Int Arch Occup Environ Health 94, 1073–1083 (2021). https://doi.org/10.1007/s00420-021-01666-2
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DOI: https://doi.org/10.1007/s00420-021-01666-2