[01] Jude Chidozie Nnaji, Department of Chemistry, Michael University of Agriculture, Umudike, Umuahia, Abia State, Nigeria.

Physico-chemical parameters of sediments samples collected from a 1.5 ha reservoir which was amended with organic manure over a fifteen year period were analysed and mean pH, conductivity, organic matter, nitrate and total nitrogen had values of 7.57 ±0.80, 355.7 ±115.71 µScm_-1, 8.78 ±1.83 %, 12.12 ±5.53 mg kg_-1 and 49.70 ±21.81 mg kg_-1, respectively. Total phosphorus, available phosphorus and cation exchange capacity had mean values of 74.61 ±41.50 mg kg_-1, 12.46 ±5.84 mg kg_-1 and 16.48 ±4.72 mmol cm_-1, respectively. Total heavy metals were determined in the samples and mean Zn concentration was significantly higher (P<0.05) than the mean concentrations of other metals. The profile of mean metal concentrations in the bed sediments was Zn>Cu>Pb>Ni>Cr>Cd. Mean Cd, Cu and Zn concentrations exceed the USEPA (1997) threshold effect levels in sediments and this is due to the long term application of manure without the dredging of the reservoir.

Reservoir, Sediment, Manure, Physico-Chemical, Metals

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