Adsorption and Activity Changes of Nitrofen by Clay Minerals

점토광물(粘土鑛物)에 의한 Nitrofen의 흡착(吸着) 및 활성(活性) 변화(變化)

The nitrofen adsorption on several clay minerals was determined by sludge method to know the effect of clay minerals on the nitrofen activity. The bioassay was conducted with wheat seedlings to study the influence of the adsorbed nitrofen on the nitrofen activity. It is apparant that a four hours shaking was enough to reach the equilibrium concentration. The more the amount of sample, the more nitrofen was adsorbed by clay minerals, whereas the more nitrofen adsorption per unit gram of sample was observed at a 200 mg addition than a 400 mg in the same nitrofen solution. A little amount of nitrofen was adsorbed on Ca-zeolite or Ca-kaolinte, and much more nitrofen was adsorbed on Na-montmorillonite than the other clay minerals in the experiment. Little effect of pH on the adsorption would be attributed to physical adsorption between nitrofen molecule and clay surface. Na-and Ca-montmorillonite were the most effective in reducing the phytotoxicity of nitrofen to the growth of wheat seedlings among clay minerals which nitrofen was added to the growth media.

점토광물(粘土鑛物)의 종류(種類)에 따른 Nitrofen의 흡착(吸着)과 6종(種)의 점토광물(粘土鑛物)과 소맥(小麥)을 사용(使用)하여 점토(粘土)현탁액 중(中)에서 Nitrofen의 활성변화(活性變化)를 조사(調査)하였다. Nitrofen은 점토광물(粘土鑛物)과의 현탁액 중(中)에서 4시간(時間)의 진탕으로 거의 평형농도(平衡濃度)에 이르렀다. 시료량(試料量)이 많을수록 Nitrofen의 흡착량(吸着量)이 증가(增加)되었으나, 시료(試料) : 용액(溶液)의 비율(比率)이 작은 편이 단위중량당(單位重量當) 흡착량(吸着量)이 많았다. 점토광물별(粘土鑛物別)로 볼 때 Nitrofen의 흡착량(吸着量)에는 큰 차이(差異)가 없었으나 Na-montmorillonite가 다소 많이 흡착(吸着)하였으며 Nitrofen의 흡착(吸着)에 pH의 영향(影響)은 거의 없었다. Growth media에 점토광물(粘土鑛物)을 첨가(添加)한 결과(結果), montmorillonite첨가(添加)가 소맥(小麥)의 저해율(沮害率)을 감소(減少)시키는데 가장 효과적(效果的)이었다.