苯并（α）芘在土壤和水稻中降解和存在形态  

DEGRADATION AND FORMS OF Bap IN SOIL AND RICE PLANT

作　　者：李书鼎[1] 张少兰[1] 马吉春[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳市环境监测中心站

出　　处：《核农学报》1995年第2期113-119,共7页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金

摘　　要：土壤薄板层析测定苯并（α）芘（ＢａＰ）的Ｒｆ值小于０．１，在土壤中ＢａＰ属于不迁移性有机化合物。土壤中ＢａＰ被降解成极性化合物（占总１４Ｃ－ＢａＰ２３．５％）、水溶形式（占１．７％）和非极性形式（占３８．４％）。土壤１４Ｃ－Ｂａｐ结合态占３６．４％。土壤表层（０～ｌｃｍ）１４Ｃ－ＢａＰ为０．１％。水稻苗期对ＢａＰ吸收速度快，且数量太，拔节期间吸收转缓，分蘖期后吸收皮达平衡。水稻体内１４Ｃ－ＢａＰ可以被代谢，根中１４Ｃ－结合态占６２％，１４Ｃ－ＢａＰ占３８％；茎中１４Ｃ－结合态为９９％，不含１４Ｃ－ＢａＰ形态；糙米中１４Ｃ－结合态占９８％，１４Ｃ－ＢａＰ仅为０．７％；叶中不含１４Ｃ－结合态，１４Ｃ－ＢａＰ为９％，其余均为１４Ｃ的其它形态。Benzo(a)pyrene(BaP)is considered to be an immovable organic compound in soil be-cause the detected Rr by soil thin-layer chromatography is less than 0.1.14C-BaP is degradedinto polar(23.5%),water-soluble(1.7%)and nonpolar compounds(38.4%)in soil.-There is 36.4%of bound form ot 14C-BaP in soil(depth>lm)and 0.1%in surface soil(0～lcm)BaP adsorption rate by rice was higher during seedling stage than jointing stage,and this adsorption reached an equllibrlum after tillering stage, 14C-Bap coul,d be metabo-lized in rice plant,aud the metabolized products existed mainly as 14C-bounds.14C-boundforms in rice root,stem and grain were 62%,99% and 98% respectively.

关 键 词：苯并(α)芘 土壤 水稻 降解 代谢 

分 类 号：S511.101[农业科学—作物学]