Dissertation/Thesis Abstract

Evaluation of Total Mercury, Zinc, Lead, and Arsenic Concentration in Fish Fillets, Water and Sediments from Dunlap Lake in Edwardsville Illinois
by Okalanwa, Chima Ezeakachi, M.S., Southern Illinois University at Edwardsville, 2018, 54; 13421566
Abstract (Summary)

Degradation of the environment by heavy metal contamination, and the attendant health risks to the human population, is a significant concern to society. Aquatic ecosystems and their constituent biota are often environmental compartments with the highest levels of metal contamination. For example, preliminary studies have found that heavy metal contamination is a concern in Edwardsville, IL. In order to further explore potential risks from heavy metals to human health and the environment, total mercury, lead, zinc, and arsenic concentration were determined in fish fillets, water, and sediments collected from Dunlap Lake, a private lake in Edwardsville Illinois. The heavy metals (Zn, Pb, Hg, and As) in fish fillets, lake water and sediment were measured using inductively-coupled plasma mass-spectrometry. Heavy metal concentrations in fillets varied among the species. The mean zinc concentration was highest (55.1 mg/kg) in redear sunfish (Lepomis microlophus) and lowest (31.0 mg/kg) in largemouth bass (Micropterus salmoides ). Average lead (Pb) concentrations in the fish fillets varied from 0.75 mg/kg in yellow bullhead (Ameiurus natalis) to 0.65 mg/kg in Largemouth bass (Micropterus salmoides) and Walleye (Sander vitreus). Mean total mercury in fillets ranged from 0.17mg/kg (Channel catfish, Ictalurus punctatus) to 0.68 mg/kg (Largemouth bass, Micropterus salmoides). Mean total arsenic concentration in fish fillets was highest in common carp (2.56 mg/kg) and lowest in walleye (Sander vitreus) and channel catfish (1.23 mg/kg). There were statistically-significant differences between the species for Hg and As concentrations (p < 0.05, ANOVA with Welch test for multiple comparisons) and no significant difference among species for Zn and Pb. The average heavy metal (Pb, Hg and As) concentration in the water were 4.62, 1.34 and 5.51 µg/L respectively and zinc below detection limit. In the sediment, the average heavy metal (Zn, Pb, Hg, and As) concentrations increased in the order Zn > Pb > As > Hg. Aqueous Lead concentration may be above the National Ambient Water Quality Criteria for aquatic life, and arsenic exceeded NAWQC for human concern effects. Lead in fillets exceeded WHO action limits. The concentrations of Hg in some largemouth bass exceeded the FDA or action limits, so further monitoring is warranted. The sediment concentrations of zinc exceeded probable effects levels. The Dunlap Lake Property Owners Association has made a recommendation of “Catch and Release Only” for largemouth bass due to concerns for potential mercury health effects

Indexing (document details)
Advisor: Theodorakis, Christopher
Commitee: Lin, Zhi-Quing, greenfield, Ben
School: Southern Illinois University at Edwardsville
Department: Environmental Sciences
School Location: United States -- Illinois
Source: MAI 58/04M(E), Masters Abstracts International
Subjects: Analytical chemistry, Environmental science
Keywords: Bioaccumulation, Fish fillets, Heavy metals, Metal speciation, Sediment concentration, Water
Publication Number: 13421566
ISBN: 978-0-438-81712-8
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