Adsorption Pattern of the Herbicide, Bentazon and Its Metabolites on Soil

제초제 Bentazon과 그 대사산물들의 토양 중 흡착양상

  • Kim, Jong-Soo (School of Applied Bioscience, Kyungpook National University) ;
  • Kim, Jang-Eok (School of Applied Bioscience, Kyungpook National University)
  • 김종수 (경북대학교 농업생명과학대학 응용생명과학부) ;
  • 김장억 (경북대학교 농업생명과학대학 응용생명과학부)
  • Published : 2009.09.30


In order to elucidate the adsorption mechanism of the herbicide, bentazon and its metabolites on soil, their adsorption patterns on soil and six adsorbents were investigated with Freundlich, Langmuir and linear isotherm. Freundlich constants ($K_f$) and maximum adsorption amount($Q^0$) of bentazon on soil was 0.55 and 3.97. Kd and Koc values of it were 0.18 and 18. The all of metabolites used except deisopropylbentazon amounts sorbed on the soil were much higher than bentazon. The most of 8-hydroxybentazon was adsorbed on soil showing $K_f$ = 316.6, $Q^0$ = 3,488, Kd = 29.7 and Koc = 2,970. Bentazon, deisopropylbentazon and 8-hydroxybentazon were shown high affinity to anion exchange regardless of pH and $NH_2$ in low pH range. Reversed phase $C_{18}$ resulted in 100% retention of N-methylbentazon regardless of pH and other metabolites were retained below 40%. The AIBA was strongly adsorbed in silica gel, COOH and cation exchange phase but poor retention was on anion exchange sorbent. 2-Aminobenzoic acid showed an amphipathic nature which had high affinity for COOH and cation exchange phase at pH 7.0 as well as $NH_2$ and anion exchange sorbent at pH 3.0.


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