Influence of Soil Biochar Aging on Sorption of the Herbicides MCPA, Nicosulfuron, Terbuthylazine, indaziflam, and Fluoroethyldiaminotriazine

摘要

Sorption of four herbicides and a metabolite of indaziflam on a fresh macadamia nut biochar and biochars aged one or two years in soil was characterized. On fresh biochar, the sorption was terbuthylazine (K_d - 595) >indaziflam (K_d - 162) >MCPA (K_d = 7.5) >fluoroethyldiaminotriazine (K_d = 0.26) and nicosulfuron (K_d = 0). Biochar surface area increased with aging attributed to the loss of a surface film. This was also manifested in a decline in water extractable organic carbon with aging. Correspondingly, an increase in the aromaticity was observed.