Exposure to toxicants in soil and bottom ash deposits in Agbogbloshie, Ghana: human health risk assessment.
Recycling of e-waste using informal or crude techniques poses serious health risk not only to the workers but also to the environment as whole. It is against this background that this paper sought to measure health risk faced by informal e-waste workers from exposure to toxicants such as lead, cadmium, chromium, copper, arsenic, tin, zinc and cobalt via oral and dermal contact with bottom ash and soil. Using random sampling techniques, 3 separate sites each (where burning and manual dismantling of e-wastes are usually carried) were identified, and a total of 402 samples were collected. The samples were analysed using standard methods for chemical analysis prescribed by the American Water Works Association (AWWA). Concentrations of Pb, Cd, Cr, Cu, As, Sn, Zn and Co in bottom ash samples from location ASH1 are 5388 ± 0.02 mg/kg (Pb), 2.39 ± 0.01 mg/kg (Cd), 42 ± 0.05 mg/kg (Cr), 7940 ± 0.01 mg/kg (Cu), 20 ± 0.07 mg/kg (As), 225 ± 0.04 mg/kg (Sn), 276 ± 0.04 mg/kg (Zn) and 123 ± 0.04 mg/kg (Co), while concentrations of the aforementioned toxicants in soil samples at location ASG1 are as follows: 1685 ± 0.14 mg/kg (Pb), 26.89 ± 0.30 mg/kg (Cd), 36.86 ± 0.02 mg/kg (Cr), 1427 ± 0.08 mg/kg (Cu), 1622 ± 0.12 mg/kg (As), 234 ± 0.25 mg/kg (Sn), 783 ± 0.31 mg/kg (Zn) and 135 ± 0.01 mg/kg (Co); used as input parameters in assessing health risk faced by workers. The results of cancer health risk faced by e-waste workers due to accidental ingestion of As in bottom ash at ASH1 is 4.3 × 10-3(CTE) and 6.5 × 10-2(RME), i.e. approximately 4 out of 1000 e-waste workers are likely to suffer from cancer-related diseases via central tendency exposure (CTE parameters), and 7 out of every 100 e-waste worker is also likely to suffer from cancer cases by reasonable maximum exposure (RME) parameters, respectively. The cancer health risk results for the other sampling sites were found to have exceeded the acceptable USEPA cancer risk value of 1 × 10-4to 1 × 10-6(i.e. 1 case of cancer per every 10,000 people to 1 case of cancer per every 1,000,000 people). The non-cancer health risk results for all the toxicants were higher in all the locations for both adult and children working the e-waste site. From the findings of this study, the government of Ghana has to immediately put in place policies that would address the safety of the e-waste workers as well as protect the environment.
Environmental Chemistry Division, CSIR-Water Research Institute, Accra, Ghana. obirisamuel@gmail.com.
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Obiri
Environmental Chemistry Division, CSIR-Water Research Institute, Accra, Ghana.
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Ansa-Asare
Environmental Chemistry Division, CSIR-Water Research Institute, Accra, Ghana.
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Mohammed
Environmental Chemistry Division, CSIR-Water Research Institute, Accra, Ghana.
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Darko
Environmental Chemistry Division, CSIR-Water Research Institute, Accra, Ghana.
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Dartey
D000328:Adult; D001151:Arsenic / Q000032:analysis*; D002648:Child; D060729:Coal Ash / Q000032:analysis*; D059029:Electronic Waste; D004781:Environmental Exposure / Q000032:analysis; D005869:Ghana; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis*; D009369:Neoplasms; D059027:Recycling; D018570:Risk Assessment; D012989:Soil Pollutants / Q000032:analysis*
D060729:Coal Ash; D019216:Metals, Heavy; D012989:Soil Pollutants; D001151:Arsenic
Agbogbloshie; Bottom soil and bottom ash; Cancer; Ghana; Informal e-waste recyclers; Non-cancer
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14585726
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22446112
Environ Pollut. 2007 Jul;148(1):62-72
17240013
Chemosphere. 2008 Apr;71(7):1269-75
18289635
Bull Environ Contam Toxicol. 2011 Oct;87(4):404-8
21818637
Chemosphere. 2002 May;47(5):507-15
11996126
Environ Int. 2011 Jul;37(5):921-8
21470682
Environ Sci Technol. 2007 Aug 15;41(16):5647-53
17874768
Environ Toxicol Pharmacol. 2010 May;29(3):209-12
21787604