Poisonous Metal Levels in Sediment and Selected Biota in Coastal Waters of Nigeria

Sediment and biota samples were collected biannually from the Bonny/New Calabar River Estuary in Niger Delta, Nigeria and analysed for poisonous metals of interest to the International Atomic Energy Agency (Pb, Cd, and Hg) using atomic absorption spectrophotometer A-500 and Direct Mercury analyser (DMA-80). Results for biota showed that Cd ranged from 0.003 to 0.558 ± 0.01mg/kg, Hg ranged from 0.014 ± 0.004 to 0.021± 0.010 mg/kg, Sediment: Cd ranged from 0.022 ± 0.001 – 0.82 ± 0.0002 mg/kg; Hg 0.010 ± 0.005 to 0.027 ± 0.009 mg/kg. Lead was below the detection limit of the instrument both in biota and sediment. The concentrations of the respective poisonous metals were within the permissible limit of the World health organization. The study showed high concentration of Cd in Crayfish compared to other seafood. The bioaccumulation factor showed higher level of Hg compared Cd while the Analysis of variance for the three stations did not show any significant variation among the three stations. Regular monitoring and comparison of level of contamination with regulatory bodies are advocated to prevent the concentration of the metal contaminants from getting to an alarming level.

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Evaluation of Groundwater Quality in the Vicinity of Khurrianwala Industrial Zone, Pakistan

Water ◽

10.3390/w10101321 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1321 ◽

Cited By ~ 7

Author(s):

Muhammad Aleem ◽

Cao Shun ◽

Chao Li ◽

Arslan Aslam ◽

Wu Yang ◽

...

Keyword(s):

Water Quality ◽

Groundwater Quality ◽

Anthropogenic Activities ◽

World Health ◽

Total Hardness ◽

Industrial Zone ◽

High Concentration ◽

Physico Chemical ◽

Health Organization ◽

National Environmental

The industrial augmentation and unguided anthropogenic activities contaminate water sources in most parts of the world especially in developing countries like Pakistan. High concentration of pollutants in groundwater affects human, soil, and crop health badly. The present study was conducted to investigate groundwater quality for drinking and irrigation purposes in an industrial zone of Pakistan. A GIS tool was used to investigate the spatial distribution of different physico-chemical parameters. In this study, the average results exceeding World Health Organization (WHO) and National Environmental Quality Standards (NEQS) were found for pH 7.84, total dissolved solids (TDS) 1492 mg/L, phosphate 0.51 mg/L, dissolved oxygen (DO) 9.92% saturation, F-coli 6.48 colonies/100 mL, Na+ 366 mg/L, HCO3− 771 mg/L, sulfate 251 mg/L, chlorides 427 mg/L, total hardness (as CaCO3) 292 mg/L, electrical conductivity (EC) 2408 μS/cm, iron (Fe) 0.48 mg/L, chrome (Cr) 0.50 mg/L, arsenic (As) 0.04 mg/L, total phosphorus (TP) 0.17 mg/L, sodium adsorption ratio (SAR) 9.76 (in meq/L), residual sodium carbonate (RSC) 9.28 meq/L, % ion balance 14.4 (in meq/L), percentage sodium ion (% Na+) concentration 58.9 meq/L, and water quality index (WQI) 69.0. The trend of cations and anions were (in meq/L) Na > Mg > Ca > K and HCO3 > Cl > CO3 > SO4 respectively. Although the results of the present study showed poor conditions of the groundwater for drinking as WQI but and irrigation purposes as SAR, it needs to improve some more conditions for the provision of safe drinking water and irrigation water quality.

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Ground Water Use Near an Open Dumpsite in a Peri-urban Community

The Journal of Solid Waste Technology and Management ◽

10.5276/jswtm/2021.252 ◽

2021 ◽

Vol 47 (2) ◽

pp. 252-257

Author(s):

O.A. Mokuolu ◽

I. Olaniyi ◽

J.O. Iji

Keyword(s):

Calcium Nitrate ◽

Quality Parameters ◽

World Health ◽

Total Hardness ◽

High Concentration ◽

Residential Community ◽

Physico Chemical ◽

High Turbidity ◽

Health Organization ◽

Iron Manganese

Quality of groundwater used for drinking and domestic purposes near an open dumpsite was investigated. Groundwater parameters for wells GW1, GW2, GW3 and GW4 were analysed and their values were compared with World Health Organization (WHO) and Nigerian Standard for Drinking Water Quality (NSDWQ). Physico-chemical and bacteriological analysis were carried out to determine the quality. Parameters analysed include; Temperature, Turbidity, Total Hardness, pH, Alkalinity, Electrical Conductivity, Total Dissolved Solids, Total Suspended Solids, Total Solids, Magnesium, E-coli, Calcium, Nitrate, BOD, COD, DO, Chloride, Sulphate, Iron, Manganese and Lead. The results indicated that all parameters except turbidity, iron and lead were within the standards, all samples showed high concentration of iron and lead while GW1, GW2 and GW3 showed high Turbidity. The study concluded that groundwater situated around the dumpsite is unfit for drinking purposes. An engineered landfill located away from residential community was recommended.

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