Studies on Removal Efficiency of Rice Bran for Pesticides.

Abstract

Rice bran effectively removed pesticides from an aqueous solution. The removal by rice bran was examined using 22 different pesticides. The removal efficiencies varied from 22.2% to 98.8%. The variation in the removal efficiency of different pesticides was studied, and the pesticides with high lipophilicity were found to be easily removed by rice bran. The amount of captan adsorbed was plotted against the equilibrium concentration of substances in solution on a logarithmic scale, and a linear relationship was obtained, indicating that the adsorption reaction was a Freundlich-type. The mechanism of pesticides removal by rice bran was attributed to the uptake into intracellular particles called spherosomes.

Effect of Spherosomes on Control of Aphis gossypii Glover in Cucumbers Using Imidacloprid

“…We previously reported the adsorption properties of spherosomes. [12][13][14] On the basis of the present data, it seems more likely that spherosomes might have a role as adsorbent materials for removal of imidacloprid in soil. Thus, spherosomes could efficiently reduce the uptake of imidacloprid in cucumbers by about 1/5.…”

“…[9][10][11] However, few detailed investigations have been made on the removal of pesticide residues in vegetables. We previously reported that rice bran effectively adsorbed organic compounds such as benzene, dichloromethane, carbon tetrachloride, trichloroethylene, and pesticides in environmental water samples 12,13) and soil. 14) Furthermore, it was confirmed that spherosomes isolated from these adsorbents were effective in removing these organic compounds.…”

Monitoring of Selected Pesticides Residue Levels in Water Samples of Paddy Fields and Removal of Cypermethrin and Chlorpyrifos Residues from Water Using Rice Bran

“…The technique was successfully used to eliminate phytotoxic effects of residual herbicides (Kalam 1998). Adachi et al (2000) observed almost 88 % removal of cypermethrin residue possible by rice bran paste. Adachi et al (2002) were performed similar type of investigation to address rice bran efficiency to remove harmful chemicals from tap water.…”

Pesticide Residue Reduction in Selected Vegetables Using Rice-Bran

“…Based on these results, we concluded that removal of pesticides by rice-bran paste is dependent on the uptake into spherosomes as we already reported the removal of pesticides by batch method. 16) Rice bran is a by-product of making polished rice from brown rice. Therefore, rice bran is very inexpensive, costing 1/50-1/40 that of activated carbon.…”