Obasi and Akudinobi 2020 - Heavy metals in Abakaliki drinking-water sources

Obasi and Akudinobi measured heavy metals in 106 water samples from lead-zinc mining communities around Abakaliki, southeast Nigeria, across pre-monsoon and post-monsoon seasons. The study reports very high drinking-water concentrations for Pb, Cd, As, Hg, Cr, Mn, Ni, Se, Ag, Zn, and Co, with groundwater near active mines highlighted as the main high-concentration setting. The paper is direct occurrence evidence for mining-influenced drinking-water sources, but it is not a branded bottled-water or mineral-water market survey.

Key numbers

• Sample size: 106 water samples collected across two seasons from Enyigba, Mkpuma Akpatakpa, Ameka, Amorie, Amanchara, Alibaruhu, and nearby communities in the Abakaliki mining area.
• Overall reported maxima in the abstract: Mn 63.45 mg/L, Pb 11.42 mg/L, Cr 14.60 mg/L, Ni 1.260 mg/L, Cd 15.67 mg/L, Ag 6.06 mg/L, Hg 2.60 mg/L, As 4.13 mg/L, Se 2.68 mg/L, Zn 10.53 mg/L, and Co 0.9 mg/L.
• Lead: pre-monsoon water samples ranged from 0 to 11.4 mg/L; post-monsoon samples ranged from 0 to 4.01 mg/L. The authors report about 85% of water samples above the WHO drinking-water guideline for lead.
• Cadmium: dry-season samples ranged from 0 to 15.67 mg/L; rainy-season samples ranged from 0 to 12.641 mg/L. The authors report 80% of samples above the WHO 0.003 mg/L drinking-water guideline for cadmium.
• Arsenic: pre-monsoon samples ranged from 0 to 4.13 mg/L; post-monsoon samples ranged from 0 to 0.856 mg/L. The authors report about 86% of samples above the WHO 0.01 mg/L drinking-water guideline for arsenic.

Methods (brief)

The study analyzed water samples from active and abandoned lead-zinc mining communities in two seasons. Metals were measured by atomic absorption spectrophotometry and ultraviolet/visible spectroscopy. The paper reports total metal concentrations in water; it does not distinguish inorganic arsenic from total arsenic, methylmercury from total mercury, or Cr(VI) from total chromium. Units are mg/L as reported by the source.

Implications

Certification: The paper supports a high-contamination context record for drinking-water sources affected by lead-zinc mining, but it should not be pooled as a United States bottled-water market benchmark.

Courses: The study is useful for teaching jurisdiction, geology, and source-type separation: mining-impacted community water can produce extreme values that should remain distinct from regulated finished bottled-water products.

App: The source may support warnings or context for private wells and community drinking-water sources near mining activity, especially where water is used directly for consumption.

Wiki pages this source may touch

• water
• bottled-drinking-water
• lead
• cadmium
• arsenic
• mercury-total
• chromium
• nickel

Verification notes

The auto-fetch filename described this as a mineral-water cadmium product hit, but the PDF is an Applied Water Science article on community water resources in Nigerian lead-zinc mining areas. The DOI in the PDF is 10.1007/s13201-020-01233-z, and no existing wiki/sources/ DOI match was found before ingest. Because the paper reports total As, total Hg, and total Cr without species resolution, the source page does not route those values as iAs, MeHg, or Cr(VI).

Page history

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