Distribution of actinomycetes in oil contaminated ultisols of the Niger Delta (Nigeria)

The distribution of actinomycetes in oil contaminated sandy loam ultisols of the Niger Delta region of Nigeria was studied to aid in understanding the effect of hydrocarbons on indigenous microbial population in tropical soils. The average total counts of actinomycetes in all the oil samples analysed was 103 cfu/g. Higher counts of actinomycetes were observed during the dry season than during the wet season. The counts of hydrocarbonoclastic actinomycetes correlated positively with the total count of actinomycetes.The actinomycetes were generally restricted to the top soil(0-10 cm soil depth) although a seemingly deeper(down to 40 cm soil depth) distribution was noticed in the dry season. The isolates included oil degrading species of Actinoplanes, Norcadia,Streptomyces and Streptosporangium. Their high oil utilization ability indicates their positive potential and role in the bioremediation of oil-spilled soils.     

Ecological risks of phenolic endocrine disrupting compounds in an urban tropical river

Environmental Science and Pollution Research - The distribution of emerging organic contaminants in drinking water sources in Africa is a subject with very scanty data and information. In order to...     

Lead levels in Chromolaena odorata (Compositae) along rural and urban roads in Akwa Ibom State, Nigeria

ＩｎｔｒｏｄｕｃｔｉｏｎＣｈｒｏｍｏｌａｅｎａｏｄｏｒａｔａ（Ｅｕｐａｔｏｒｉｕｍｏｄｏｒａｔｕｍ），ｃｏｍｍｏｎｌｙｃａｌｌｅｄ“ｓｉａｍｗｅｅｄ”ｗａｓｉｎｔｒｏｄｕｃｅｄｉｎｔｏＮｉｇｅｒｉａａｂｏｕｔ３０ｙｅａｒｓａｇｏ．Ｉｔｉｓａｓｔｒｏｎｇｌｙｓｃｅｎｔｅｄ，ｄｉｆｆｕｓｅ，ａｎｄｒａｐｉｄｌｙｇｒｏｗｉｎｇｈｅｒｂｔｈａｔｃａｎａｔｔａｉｎａｈｅｉｇｈｔｏｆ３－０ｍｅｔｅｒｓｏｒｍｏｒｅ．Ｉｔｉｓｌｏｃａｌｌｙｃａｌｌｅｄ“ｏｗｏｔｏｗｏ”ｂｅｃａｕｓｅａｔｉｔｓｄｅｂｕｔｉｔｗａ…     

Distribution of actinomycetes in oil contaminated ultisols of the Niger Delta (Nigeria)

ＩｎｔｒｏｄｕｃｔｉｏｎＡｃｔｉｎｏｍｙｃｅｔｅｓ(ｆｉｌａｍｅｎｔｏｕｓｂａｃｔｅｒｉａ)ｃｏｎｓｔｉｔｕｔｅａｇｒｏｕｐｏｆｍｉｃｒｏｏｒｇａｎｉｓｍｓｔｈａｔｉｓｗｉｄｅｌｙｄｉｓｔｒｉｂｕｔｅｄｉｎｓｏｉｌ.Ｐｌａｔｉｎｇｅｓｔｉｍａｔｅｓｇｉｖｅｖａｌｕｅｓｒａｎｇｉｎｇｂｅｔｗｅｅｎ 10 5ａｎｄ 10 8ｃｏｌｏｎｙｆｏｒｍｉｎｇｕｎｉｔｓ(ｃｆｕ) ｐｅｒｇｒａｍｏｆｓｏｉｌｉｎｔｅｍｐｅｒａｔｅｚｏｎｅａｌｔｈｏｕｇｈｌｏｗｅｒｖａｌｕｅｓｈａｖｅｂｅｅｎｒｅｃｏｒｄｅｄｉｎｔｈｅｒｅｇｉｏ…     

Bioamendment of petroleum contaminated ultisol: effect on oil content, heavy metals and pH of tropical soil

ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｓｔｓｏｉｌｐｏｌｌｕｔｉｏｎｓｉｔｕａｔｉｏｎｓｉｎｖｏｌｖｅｓｅｖｅｒａｌｐｏｌｌｕｔａｎｔｓａｃｔｉｎｇｓｉｍｕｌｔａｎｅｏｕｓｌｙ .Ｔｈｅｐｒａｃｔｉｃａｌａｓｓｅｓｓｍｅｎｔｏｆｔｈｅｏｖｅｒａｌｌｔｏｘｉｃｉｔｙｈａｓｔｈｅｒｅｆｏｒｅｒｅｍａｉｎｅｄａｍａｊｏｒｐｒｏｂｌｅｍ .ＡｍｏｎｇｔｈｅｎｅｇａｔｉｖｅｅｆｆｅｃｔｓｏｆｅｘｐｌｏｒａｔｉｏｎａｎｄｐｒｏｄｕｃｔｉｏｎａｃｔｉｖｉｔｉｅｓｉｎｏｉｌｐｒｏｄｕｃｉｎｇｃｏｍｍｕｎｉｔｉｅｓｉｎＮｉｇｅ…     

Phytoextraction potential of Sporobulus pyramidalis found in an abandoned battery industry environment in Nigeria

The levels of heavy metals (Cd, Cr, Ni, Pb, Sb and V) in Sporobulus pyramidalis plant species from an abandoned battery industry environment were determined during the wet and dry seasons as follows: The ranges in metal concentrations during the wet and dry seasons were 0.002, 0.420, 0.036 and 36.10?µg?g^?1, respectively. The coefficients of variation for the metals during wet and dry seasons ranged between none to 151.724% and 13.838–214.935%, respectively. The results showed higher levels of the metals in S. pyramidalis during the dry than wet season. Results obtained from both wet and dry season when compared with background values, Federal Environmental Protection Agency and other international standards revealed that the plant species accumulated high levels of these heavy metals which was evident in concentrations exceeding maximum tolerable limits. The health implications of consuming this plant and any other plant or crop within this environment are discussed.     

Levels of toxic metal in Achatina achatina from parts of Akwa Ibom State, Nigeria

ＩｎｔｒｏｄｕｃｔｉｏｎＳｎａｉｌｓａｒｅｔｙｐｉｃａｌｕｎｉｖａｌｖｅｓｔｈａｔｂｅｌｏｎｇｔｏｔｈｅｐｈｙｌｕｍｍｏｌｌｕｓｃａ.Ｔｈｅｙａｒｅｅｉｔｈｅｒａｑｕａｔｉｃｏｒｔｅｒｒｅｓｔｒｉａｌａｎｄｔｈｅｃｏｍｍｏｎｔｅｒｒｅｓｔｒｉａｌｓｐ?..     

Correlation between levels of some heavy metals in plants and sediments from a segment of Calabar River and associated creeks in Cross River state of Nigeria

Plants and sediments were collected at three sites along Calabar River (CR), Upper Town Creek (UCC) and Lower Town Creek (LCC). The CR is a major tributary of Cross River, Nigeria. The concentrations of 10 heavy metals were determined and results for Fe, Mn and Zn at almost all the sites showed that the levels of these metals exceeded the amounts present in non-polluted areas. Fe was found in the highest concentration at all three sites in both plants and sediments. Correlation analysis between levels of heavy metals in plants and sediments were also determined. The occurrence of higher concentrations of heavy metals in plants and coastal sediments at CR, UCC and LCC is an indication of anthropogenically induced pollution rather than contributions from natural sources.     

Interseasonal distribution and partitioning of heavy metals in subtidal sediment of Qua Iboe Estuary and associated Creeks, Niger Delta (Nigeria)

An analysis of the distribution and chemical forms of selected metals: cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and lead (Pb) in subtidal sediments of Qua Iboe Estuary and adjourning creeks, collected between June 2000 and January 2001, were studied using a sequential chemical extraction method. The concentration of metals in each extracted fraction was determined using inductively coupled plasma spectrometer (ICP-AES). Pb, Cd and Cu appear to be the most abundant metal in the sediments of the systems, and are predominantly associated with the residual, organic and oxidisable phases. Results indicate that there are also insignificant components that are bound to both the exchangeable and carbonates fractions. Ni is largely associated with bioavailable phases with insignificant bound to organic matter and residual fractions. In general, an insignificant component of Cd and Pb are bound to organic matter phase. Moreover, speciation results indicate that metal contamination in the ecosystems investigated primarily comes from human-mediated sources. Thus, based on index of geoaccumulation calculated, sediments of these ecosystems have been classified as uncontaminated by Cr, Cu and Ni, strongly contaminated by Pb and extremely contaminated by Cd.     

Variations in oxygen and some related pollution parameters in some streams in ITU Area of Nigeria

ＩｎｔｒｏｄｕｃｔｉｏｎＰｈｙｓｉｃａｌａｎｄｃｈｅｍｉｃａｌｐｒｏｐｅｒｔｉｅｓａｒｅｏｆｇｒｅａｔｓｉｇｎｉｆｉｃａｎｃｅｔｏｔｈｅｗｏｒｋｉｎｇｏｆａｎｙａｑｕａｔｉｃｅｃｏｓｙｓｔｅｍ.Ｉｎｍｏｓｔｃａｓｅｓ,ｔｈｅｃｈｅｍｉｃａｌｐｒｏｐｅｒ...