© Journal Of Chemical Society Of Nigeria (jcsn) . 2010. Vol. 35 No. 2
Publisher: Chemical Society of Nigeria
Influence of Herbicides On The Concentration of Some Selected Heavy Metals On Farmlands At Ibaji, Kogi State Nigeria.
E. Okorie, M. Acheneje, C. N. Omego, E. F. Chibugo
KEYWORDS: Herbicides, heavy metals, FAAS, soot, soil.
ABSTRACT:The influence of herbicide applications on the presence of some heavy metals on farmlands in Ibaji, Kogi State was investigated using flame atomic absorption spectrometer. Results of this study showed that there was a significant increase in the concentration of Cd, Cr, Cu and Pb in areas where herbicides application is in use. The concentration range of Cu, Cd, Cr and Pb in the HTHPF are 253.6±3.3 mg/Kg –329.5±2.4 mg/Kg (Cu), 2.2±0.9 mg/Kg – 21.2±0.7 mg/Kg (Cd), 74.5±2.2 mg/Kg – 153.7± 1.3mg/Kg (Cr) and 0 – 126.9±1.4 mg/Kg (Pb), while the concentration range for NHTF are 135.6±2.7 mg/Kg - 214.7± 2.9 mg/Kg(Cu), 0 – 12.6±1.1 mg/Kg (Cd), 53.5±5.2 mg/Kg – 114.2±1.1 mg/Kg (Cr) and 0 – 33.1±2.2 mg/Kg (Pb). A variation in the distribution of these metals at various depths was also observed. Cu and Cd in HTHPF increased with an increase in depth. However, no Cd was observed at depth 10 cm and 20 cm. Cr concentration followed a downward trend from 153.7±1.3 mg/Kg (topsoil) to 74.5±2.2 mg/Kg (15 cm), but increased sharply at 20 cm depth to 127.0±2.1mg/Kg. The concentration of Pb increased from 42.0±2.9 mg/Kg (topsoil) to 49.2±1.5 mg/Kg (5 cm) and decreased from 126.9±1.4 (15 cm) to 78.9±1.1 (20 cm). At 10 cm depth, Pb was not detected. For the NHTF, the concentration of Cu are 135.6±2.7 mg/Kg (topsoil), 159.6±2.4 mg/Kg (5 cm), 182.6±1.6 mg/Kg (10 cm), 214.7±2.9 mg/Kg (15 cm) and 213.9±3.8 mg/Kg (20 cm). Cd was not detected at topsoil, 15 cm and 20 cm but was observed at 5 cm depth (12.6±1.1 mg/Kg) and 10 cm depth (0.60±1.8 mg/Kg). Cr decreased gradually as the depths increased from 114.2±1.1 mg/kg (topsoil), 79.2±3.2 mg/Kg (5 cm), 73.8±1.5 mg/Kg (10 cm), 57.0±2.2 mg/Kg (15 cm) and 53.5±5.2 mg/Kg (20 cm). No Pb was observed from topsoil through 15 cm depths, but was detected at 20 cm depth (33.1±2.2 mg/Kg).Other anthropogenic sources of these metals were also considered with increases in their concentration as a result of soot discharge from exhaust of diesel powered automobiles. This increase in concentrations of these metals as a result of herbicide application was attributed to binding thereby increasing the metal-herbicide association. This herbicide use may accumulate these metals in the soil and eventually lead to land pollution and bioaccumulation as a result of plant uptake.
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