Heavy metals in the lagos lagoon sediments

Abstract

Concentrations of cadmium, cobalt, copper, chromium, iron, manganese, nickel, lead and zinc were determined in surface sediments of the Lagos Lagoon, Nigeria. The results revealed largely anthropogenic heavy metal enrichment and implicated urban and industrial wastes and runoff water transporting metals from land-derived wastes, as the sources of the enrichment. Higher levels (F < 0.05) of cadmium, iron, manganese, nickel and zinc occurred in sediment samples collected near industrialized-urban areas than in those from unindustrialized-rural areas only in the wet season. While iron constituted about 1% of dry sediment by weight, the other metals were present in trace amounts.

Distribution of Fe, Pb, Cu, Cr and Cd in the Flesh, Gills and Liver of Fish (Synodontis Batensonda) Samples from River Galma, Zaria, Nigeria

“…This pattern is in line with the natural distribution these metals in the earth crust. The results obtained for the total concentrations of these metals in the fish sample analysed are generally lower than the results reported by [16][17][18][19][20][21] and higher than results reported by Eletta, et al [22] and conform with result reported by Tukura, et al [23] the…”

Distribution of Lead and total Hydrocarbon in Tissues of Periwinkles (Tympanotonus fuscatus and Pachymelania aurita) in the upper Bonny River, Nigeria

“…Their value compares favourably with those of domestic livestock and fish (Dambo, 1993). It is therefore important to determine the levels of metals in these organisms (Okoye, 1991;Paez-Osuna and Ruizx, 1995 (2) Sample collection, preparation and analysis: Grids were marked at each station Periwinkle samples were hand picked at ebb tide fortnightly from the study sites at specific locations. Periwinkles were put into perforated plastic cans with cover, which had been washed with distilled water and left to dry prior to sample collection, and taken to the laboratory.…”

Effects of Electromagnetic fields on the Physicochemical Properties of Waste Water Samples from Selected Industries in Akure Metropolis

“…Although pH usually has no direct impact on consumers, it is one of the most important operational water quality parameters. Extremes of pH can affect the palatability of a water but the corrosive effect on distribution systems is a more urgent problem (18).The pH is of the utmost importance in determining the corrositivity of water (16). In general, the lower the value of pH, the higher the level of corrosion.…”

“…Organic wastes and other nutrient inputs from sewage and industrial discharges, agricultural and urban runoff can result in decreased oxygen levels. Nutrient input often leads to excessive algal growth; when the algae die, the organic matter is decomposed by bacteria, a process which consumes a great deal of oxygen that could lead to oxygen sag (16). A high DO level in a community water supply is good because it makes drinking water taste better.…”

“…These effluent from industries have a great deal of influence on the pollution of the water body, these effluent can alter the physical, chemical and biological nature of the receiving water body. Increased industrial activities have led to pollution stress on surface waters both from industrial, agricultural and domestic sources (16). Water of good drinking quality is of basic importance to human physiology as well as indispensable to man's continued existence (1).…”