Environmental Behavior of Bentazon Herbicide

Stimulation of aerobic degradation of bentazone, mecoprop and dichlorprop by oxygen addition to aquifer sediment

“…Due to their relatively high solubility in water (Huber and Otto, 1994;Tomlin, 1997) and low sorption characteristics, they leach from the soil into aquifers and are often detected in groundwater (Barbash et al, 2001;Thorling et al, 2012;Malaguerra et al, 2012).…”

“…For instance, bentazone is biodegradable in topsoils under aerobic conditions (Huber and Otto, 1994;Leistra et al, 2001;Li et al, 2008;Rodriguez-Cruz et al, 2008;Larsbo et al, 2009), but it appears to be recalcitrant in aquifers under aerobic conditions (Tuxen et al, 2000;Broholm et al, 2001). In contrast, the degradation of mecoprop and dichlorprop has been observed both in topsoil (Smith, 1989) and in aquifers under aerobic conditions (see the reviews of Buss et al, 2006;Reitzel et al, 2004;Janniche et al, 2010).…”

Evolução de CO2 e atividades enzimáticas em amostras de solo tratado com herbicidas

“…Segundo Huber & Otto (1994), esse herbicida é rapidamente degradado pela microflora aeróbica na camada superficial do solo, resultando que parte considerável do herbicida é mineralizada a CO 2 (24-50%) e o restante caracterizado por produtos intermediários instáveis, os quais são imediatamente fixados, biótica ou abioticamente. A evolução da emissão de CO 2 nesse tratamento mostra que, depois da redução da atividade respiratória inicial, aparentemente, houve estímulo no final do período de incubação.…”

Herbicides Persistence in Rice Paddy Water in Southern Brazil

“…Its selectivity is based on the ability of the crop plants to metabolize bentazon quickly to 6-OH-and 8-OH-bentazon and conjugate these with sugars, while weeds do not, so that photosynthesis is disrupted and the weeds die (Huber & Otto, 1994). The small K ow value precludes bioaccumulation.…”