Studies on the Several Soil Factors Affecting on Alachlor and Paraquat Adsorption by Soils

Alachlor 와 Paraquat 의 토양흡착(土壤吸着)에 관여(關與)하는 토양인자(土壤因子)에 대한 연구(硏究)

In order to illustrate adsorption phenomena of herbicides(alachlor and paraquat) on soils, absorption equation of herbicides and the relationships between soil properties and adsorption constants were investigated with 22 soils. The results were as follows : 1. The shaking time for approaching equillibrium reaction of herbicides(alachlor and paraquat) with woils were about 30 minutes for paraquat and 4 hours for alachlor, respectively. 2. The distribution coefficients of alachlor were inbetween 0.81-33.83 in 5 ppm and 0.09-15.52 in 50 ppm, respectively. 3. The adsorption of alachlor was positively correlated with organic matter and paraquat was with clay content of soils. 4. Both paraquat and alachlor were highly adsorbed in Chunpo series soil containing low contents of organic matter and clay on account of different mechanism from other soils, 5. Freundlich's adsorption constant(K) was greater than distribution coefficient(Kd), and the differences between K and Kd's were to be increased with increasing equillibrium concentrations.

토양에 따른 제초제의 흡착을 구명하기 위하여 alachlor와 paraquat를 사용하여 공시토양 22에 대한 약제별 흡착정도 및 토양특성과 흡착정도의 상관을 조사한 결과는 다음과 같다. 1. 진탕시간에 따른 토양과 약제의 평형이 이루어지는 시간은 paraquat가 약 30분, alachlor는 약 4시간이었다. 2. 분배법칙에 의한 alachlor의 흡착계수는 5ppm 농도에서 0.81-33.83이었으며, 50ppm에서는 0.09-15.52의 범위를 나타내었다. 3. 토양특성중 alachlor의 흡착력은 O.M.함량, paraquat의 흡착력은 점토함량과 고도의 정의 상관을 보였다. 4. 우리나라 토양중 춘포통은 유기물과 점토함량이 낮음에도 특이한 특성 때문에 paraquat와 alachlor 모두 높은 흡착량을 나타내었다. 5. Freundlich의 흡착상수(K)는 분배법칙의 계수(Kd)보다 대체적으로 높으며, 평형농도가 증가함에 따라 K와 Kd값의 차이는 증가하는 경향이었다.