Kinetics of Nickel-Fulvate Reaction in Sewage Effluents Irrigated Soils
2014
Kumar, Vipin | Prasad, R.K. | Prasad, B. | Singh, A.P.
The kinetics of nickel-fulvate (Ni-FA) reaction with sewage effluents irrigated soils between 0 to 144 h conformed to first order reaction. As predicted by kinetic model, the kinetic constant for the loss of Ni from Ni-fulvate varied from 1105 to 1887 mol h⁻¹ (av. 1424 mol h⁻¹) at 15°C, from 1179 to 1828 mol h⁻¹ (av. 1555 mol h⁻¹) at 30°C and from 1175 to 2317 mol h⁻¹ (av. 1709 mol h⁻¹) at 45°C. These results revealed that rate of Ni-fulvate reaction in soils increased with increasing temperature indicating rates of Ni-FA reaction were temperature dependent. The rate of loss of Ni from Ni-FA by competing ions was positively and significantly correlated with organic carbon (r = 0.512*). The half life of residence of Ni-FA reaction in soils ranged from 3.7×10⁻⁴ to 6.3×10⁻⁴ h (av. 4.98×10⁻⁴ h) at 15°C, from 3.6×10⁻⁴ to 5.9×10⁻⁴ h (av. 4.53×10⁻⁴ h) at 30°C and from 3.0×10⁻⁴ to 6.9×10⁻⁴ h (av. 4.55×10⁻⁴ h) at 45°C. The half life time of residence of Ni-FA in soil decreased with increasing temperature. The average diffusion coefficient of Ni increased from 4.58×10⁻⁶ to 7.04×10⁻⁶ cm² sec⁻¹ with increasing temperature from 15 to 45°C indicating that diffusion is temperature controlled reaction.
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