Changes in sorption/bioavailability of imidacloprid metabolites in soil with incubation time

被引:54
作者
Koskinen, WC
Cox, L
Yen, PY
机构
[1] USDA ARS, Soil & Water Management Res Unit, St Paul, MN 55108 USA
[2] CSIC, Inst Recursos Nat & Agrobiol Sevilla, Seville 41080, Spain
[3] Bayer Corp, Stilwell, KS 66088 USA
关键词
imidacloprid metabolites; aging effects; sorption; bioavailability;
D O I
10.1007/s003740100366
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Changes in sorption/bioavailability of two metabolites, imidacloprid-urea {1-[(6-chloro-3-pyridinyl) methyl]-2-imidazolidinone} and imidacloprid-guanidine {1-[(6-chloro-3-pyridinyl)methyl]-4,5-dihydro-1H-imidazol-2-amine} of the insecticide imidacloprid {1-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolidinimine} with aging in different soils were determined, Soil moisture was adjusted to -33 kPa and C-14- and analytical-grade imidacloprid-urea and imidacloprid-guanidine were added to the soil at a rate of 1.0 mg kg(-1). Spiked soils were incubated at 25 degreesC for 8 weeks. Replicate soil samples were periodically extracted successively with 0.01 N CaCl2, acetonitrile, and 1 N HCl. Imidacloprid-urea sorption, as indicated by sorption coefficient values, was highest in the soil with highest organic C content, and increased by an average factor of 2.6 in three soils during the 8-week incubation period. Imidacloprid-guanidine sorption increased by a factor of 2.3 in the same soils. The increase in sorption was the result of a de crease in the metabolite extractable with CaCl2 (solution phase); the amount of metabolite extractable with acetonitrile and HCl (sorbed phase) did not significantly change with incubation time. It appears the increase in sorption was because the rate of degradation in solution and on labile sires was faster than the rate of desorption from the soil particles. It may have also been due to metabolite diffusion to less accessible or stronger binding sites with time. Regardless of the mechanism, these results are further evidence that increases in sorption during pesticide aging should be taken into account during characterization of the sorption process for mathematical models of pesticide degradation and transport.
引用
收藏
页码:546 / 550
页数:5
相关论文
共 26 条
[1]   SOIL-MOISTURE AND THE RATES OF BIODEGRADATION OF DIALLATE AND TRIALLATE [J].
ANDERSON, JPE .
SOIL BIOLOGY & BIOCHEMISTRY, 1981, 13 (02) :155-161
[2]   MEASUREMENT AND PREDICTION OF ISOPROTURON MOVEMENT AND PERSISTENCE IN 3 SOILS [J].
BLAIR, AM ;
MARTIN, TD ;
WALKER, A ;
WELCH, SJ .
CROP PROTECTION, 1990, 9 (04) :289-294
[3]  
Boesten J. J. T. I., 1983, Aspects of Applied Biology, P495
[4]   CONVECTIVE-DISPERSIVE SOLUTE TRANSPORT WITH A COMBINED EQUILIBRIUM AND KINETIC ADSORPTION MODEL [J].
CAMERON, DR ;
KLUTE, A .
WATER RESOURCES RESEARCH, 1977, 13 (01) :183-188
[5]   Differences in sequestration and bioavailability of organic compounds aged in dissimilar soils [J].
Chung, NH ;
Alexander, M .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1998, 32 (07) :855-860
[6]   ADSORPTION AND DESORPTION OF ATRAZINE, HYDROXYATRAZINE, AND S-GLUTATHIONE ATRAZINE ON 2 SOILS [J].
CLAY, SA ;
KOSKINEN, WC .
WEED SCIENCE, 1990, 38 (03) :262-266
[7]   Changes in sorption of imidacloprid with incubation time [J].
Cox, L ;
Koskinen, WC ;
Yen, PY .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1998, 62 (02) :342-347
[8]   Sorption-desorption of imidacloprid and its metabolites in soils [J].
Cox, L ;
Koskinen, WC ;
Yen, PY .
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 1997, 45 (04) :1468-1472
[9]   CHANGES IN THE CONCENTRATIONS OF ISOPROTURON AND ITS DEGRADATION PRODUCTS IN SOIL AND SOIL SOLUTION DURING INCUBATION AT 2 TEMPERATURES [J].
GAILLARDON, P ;
SABAR, M .
WEED RESEARCH, 1994, 34 (04) :243-250
[10]   SORPTION AND DESORPTION OF IMAZETHAPYR AND 5-HYDROXYIMAZETHAPYR IN MINNESOTA SOILS [J].
GAN, JY ;
WEIMER, MR ;
KOSKINEN, WC ;
BUHLER, DD ;
WYSE, DL ;
BECKER, RL .
WEED SCIENCE, 1994, 42 (01) :92-97