PERSISTENCE AND BINDING OF P,P'-DDE IN SOIL

被引:12
作者
AGARWAL, HC
SINGH, DK
SHARMA, VB
机构
[1] Department of Zoology, University of Delhi, Delhi
关键词
C-14; P; P'-DDE; PERSISTENCE; SOIL; BOUND RESIDUES;
D O I
10.1080/03601239409372861
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Soil was treated with C-14-p,p'-DDE and left under field conditions for 545 days. The dissipation of the chemical was apparently biphasic; halflife of dissipation 271 days. After one year, 61% of the initially applied radiocarbon was lost from soil. Methanol-extractable residues declined to about 29% after one year and were shown by TLC and HPLC, to contain mainly p,p', DDE and a small amount of DDMU. Initially, the proportion of bound (unextractable) residues was very small but increased gradually to 8.7% after one year and declined thereafter to 7% after 1.5 years. These soil-bound residues, released by treatment with sulfuric acid consisted exclusively of p,p'-DDE. Volatilization and to a lesser extent mineralization were the main mechanisms for the loss of DDE residues from the soil.
引用
收藏
页码:87 / 96
页数:10
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