Degradation Of Bronopol And Its Effects On Biology In Soil

Bronopol is an ultra-high effect and wide-spectrum bactericide. Previous studies focused mainly on application efficacy and analytical methods, little information was available about its degradation and the toxicity to biology in soil. In order to provide some fundamental data for assessing the environment safety and scientific application, the degradation of bronopol and its effects on urease, catalase, soil respiration and acute toxicity to earthworm were studied, under control conditions by stimulating methods in laboratory. The main results were follows:(1) The degradation of bronopol in soil follows a first-order degradation curve, and degradation rate is quicker in river tidal soil than in red soil. The half-life of bronopol in river tidal soil and red soil is 2.77d and 3.46d, respectively, suggesting that bronopol should be very degradable bactericide.(2) To the degradation of bronopol, biological factor is more important than non-biological factor, even though non-biological factor is important. Through sterilization, the half-life of bronopol in river tidal soil and red soil is 8.85d and 10.43d, respectively.(3) Degradation rate of bronopol increased with the increasing water-hold capacity of soil; with the increase of temperature and concentration of bronopol, Degradation rate of bronopol show the "increase-maximum-decrease".(4) With the increasing concentration of bronopol, the inhibition rate of urease and catalase activity increases, and the inhibition rate of urease activity is more than of catalase activity.(5) Under the effect of bronopol, urease activity show the "inhibition-stimulation -recovery", and catalase activity show the "inhibition-recovery".(6) The inhibition rate of bronopol on urease activity in river tidal soil is more than in red soil, but, to catalase, it is contrary.(7) The effects of bronopol on soil respiration show "inhibition-stimulation-...