Bawa-Allah Kafilat Adebola, Saliu Joseph Kayode, Otitoloju Adebayo Akeem
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引用次数: 16
摘要
摘要本研究旨在评估尼日利亚拉各斯泻湖重金属污染现状及潜在生态风险。采用原子吸收分光光度法(AAS)测定了泻湖沉积物中12种与环境污染有关的重金属的浓度,并采用冷蒸气法测定了汞(Hg)。采用非经验风险指数和经验沉积物质量指南(SQGs)对沉积物中重金属的生态风险进行了评价。非经验风险指数表明,汞、砷和镉是造成生态系统重金属污染生态风险的主要因素。重金属浓度与筛选快速参考表(SQuiRT)的比较表明,旱季和雨季镉的平均浓度(分别为5.22和4.88 mg kg - 1)超过了对生物群的影响范围低值(ERL)值(1.20 mg kg - 1)。位于泻湖周围的工业在泻湖中有污水输出点,作为重金属的主要来源,加上其他来源的间接排放。重金属是不可生物降解的,有毒的,并有可能改变生态系统的健康,因此应有效监测和控制污染源。
Integrated assessment of the heavy metal pollution status and potential ecological risk in the Lagos Lagoon, South West, Nigeria
ABSTRACT This study was carried out to assess the heavy metal pollution status and potential ecological risk in the Lagos lagoon, Nigeria. The concentrations of twelve heavy metals commonly associated with environmental pollution were determined in the sediments of the lagoon by Atomic Absorption Spectrophotometry (AAS) and the cold vapor method was employed for Mercury (Hg). Nonempirical risk indices and empirical Sediment Quality Guidelines (SQGs) were used to assess the ecological risk associated with heavy metal in the sediments. The nonempirical risk indices showed that Hg, Arsenic (As), and Cadmium (Cd) are the major contributors to the ecological risk associated with heavy metal pollution in the ecosystem. Comparison of heavy metal concentrations to the Screening Quick Reference Table (SQuiRT) showed that mean concentration of Cd (5.22 and 4.88 mg kg−1 in dry and rainy seasons, respectively) exceeds the effect range low (ERL) value (1.20 mg kg−1) in effect to biota. Industries sited around the lagoon have effluent output points in the lagoon serving as a major source of heavy metals coupled with indirect discharges from other sources. Heavy metals are nonbiodegradable, toxic and have the potential to alter ecosystem health, thus pollution sources should be effectively monitored and contained.
期刊介绍:
Human and Ecological Risk Assessment provides a resource for professionals researching and assessing environmental hazards to both humans and ecological systems. The editors expect papers published to be original, of sound science, purposeful for risk analysis (assessment, communication, management) and related areas, well written (in English), and a contribution to the scientific literature.
The journal''s emphasis is on publication of papers that contribute to improvements in human and ecological health. The journal is an international, fully peer-reviewed publication that publishes eight issues annually. The journal''s scope includes scientific and technical information and critical analysis in the following areas:
-Quantitative Risk Assessment-
Comparative Risk Assessment-
Integrated Human & Ecological Risk Assessment-
Risk Assessment Applications to Human & Ecosystems Health-
Exposure Assessment-
Environmental Fate Assessment-
Multi-Media Assessment-
Hazard Assessment-
Environmental Epidemiology-
Statistical Models and Methods-
Methods Development/Improvement-
Toxicokinetics Modeling-
Animal to Human Extrapolation-
Risk Perception/Communication-
Risk Management-
Regulatory Issues