土壤和水稻中正十六烷的结合残留  

BOUND RESIDCE OF CETANE IN SOIL AND RICE PLANT

作　　者：李书鼎[1] 李雪莲[2] 张少兰[3] 马吉春[3] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110015 [2]沈阳工业大学,沈阳110023 [3]沈阳市环境监测中心站,沈阳110015

出　　处：《土壤学报》1998年第1期81-87,共7页Acta Pedologica Sinica

基　　金：国家自然科学基金

摘　　要：利用14C-正十六烷示踪技术、水稻盆栽和溶剂连续化学提取方法，研究了正十六烷在土壤水稻系统中的某些行为。结果表明，正十六烷容易进入水稻并累积于籽实，对人类健康产生不良影响。实验还探讨了土壤和水稻体内14C－正十六烷的存在和代谢转化过程。土壤中的正十六烷14C主要以溶剂可提取形式存在，大约占总14C的39％，其次是存在于土壤未分解的植物残体（大约占25％）和富啡酸组分（大约占23％）。以无机碳酸盐存在的大约占10％，进入胡敏酸（包括胡敏素）结构的数量较少，总计约占3％。正十六烷在水稻体内主要以结合残留态存在，大约占植物体总14C的98％，石油醚、乙醇和乙醇等有机溶剂可提取部分大约占2％。正十六烷进入水稻系统后，经历时间愈短，结合残留态愈少，溶剂可提态愈多。在石油醚提取液中，Rf值大于正十六烷的极性代谢物占21％。Some environmental behavious of cetane were studied using the tracing technique of 14C-cetane, rice pot culture and sequential solvent-extraction method. Results showed that cetane entered easily into rice plant and accumulated in rice grain, thus giving harmful effects on human health. Existing forms and metabolic process of 14C-cetane in soil and rice were also studied. 14C originated from cetane maily existed as solvent-extracted form (about 39% of all 14C), and second one in undecomposed remains of plants (about 25%) and fulvic acid (about 23%) in soil. 14C existing as carbonat was about 10%. 14C entering in humic acid (include humin) was less (about 3%). Cetane mainly existed as bound residue in rice, with amount being 98% of all 14C in plant. The organic solvents-extracted (petroleumether, ether and ethanol) amount was 2%. The shorter the bine passed after cetane addition in rice system, and the less the form of bound residues, the more the solvent-extrasted part. Polar metabolites with a bigger Rf-value accounted for 21% in the petroleum etherextracted part.

关 键 词：正十六烷 形态 结合残留 土壤 水稻 

分 类 号：S151.93[农业科学—土壤学]