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2 Polish Journal of Environmental Studies

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Development of an analytical method for determining tributyltin and triphenyltin in seawater, sediment, and mussel samples using GC-FPD and GC-MS – TOF

100%

Okoro H. K. , Fatoki O. S. , Ximba B. J. , Adekola F. A. , Snyman R. G.

Polish Journal of Environmental Studies

2012

tom 21

nr 6

Analytical methods for speciation of targeted organotin compounds (TBT and TPT) in water samples using SPE cartridge and liquid-liquid extraction has been carried out. Also, sediment analysis using methanolacid digestion and acid-sonication extraction methods also were developed. Different parameters affecting extraction and peak resolution were optimized. Also, three derivatization procedures were optimized. The accuracy of the extraction procedure also was verified on certified reference material (BCR-462) certified for TBT (54±15 μg/kg) and DBT (68±12 μg/kg). Freeze-dried mussel tissue (ERM-CE 477) was certified for TBT (2.20±0.19 mg/kg), DBT (1.54±0.12 mg/kg), and MBT (1.50±0.28 mg/kg). The two certified reference materials were used for recovery experiments. Good recoveries were obtained with methanol-acid digestion. The result was validated by analyzing the real water and sediment samples collected from Cape Town harbor and the compounds were detected in both water and sediment samples. Extraction of water samples with SPE gave better recovery for TPT than TBT. Performance characteristics such as linearity, detection limit (LOD), quantification limit (LOQ), and recovery were determined. Recoveries of TBT and TPT in spiked water using SPE were 65% and 70%, respectively. Quantitative recoveries also were recorded for the certified reference standards of sediments and mussel materials used.

An assessment of heavy metals contents in the soil around a cement factory in Ewekoro,Nigeria using pollution indices

86%

Okoro H. K. , Orimolade B. O. , Adebayo G. B. , Akande B. A. , Ximba B. J. , Ngila J. C.

tom 26

nr 1

This study investigated the concentrations of heavy metals in soils around the WAPCO cement factory in Ewekoro in southwestern Nigeria. A total of 27 soil samples were collected from three locations (Ewekoro, Papalanto, and Itori) around the cement factory. Atomic absorption spectroscopy was used to determine the concentrations of metals. The results revealed that the mean values of the metals content in the three soil samples were in the order: Fe > Zn > Mn > Cr > Cu > Pb. The concentrations of Pb present in Ewekoro and Papalanto samples were 0.391 and 0.243 mg/kg, respectively while Pb was not found in the control area (Itori). The concentrations of the heavy metals in the soil samples were found to decrease as the distances of the communities from the cement factory increased. Our study revealed that study area soils were affected by dust emissions from the cement factory as shown in the very low concentrations of heavy metal contents of the control study area, Itori.