Volume 15 Issue 4
Nov.  2019
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S.M.A.D.ZAYED, M.FARGHALY, H.TAHA. Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions[J]. Biomedical and Environmental Sciences, 2002, 15(4): 306-314.
Citation: S.M.A.D.ZAYED, M.FARGHALY, H.TAHA. Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions[J]. Biomedical and Environmental Sciences, 2002, 15(4): 306-314.

Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions

Funds:  This work was supported by FAO/IAEA-division for its fmancial support
  • Obiectives To study the mineralization of 2,4-D in clay and clay loam Egyptian soils under subtropical conditions over a period of 90 d. Methods Using 14C-ring labelled pesticide, laboratory studies under aerobic and anaerobic conditions were conducted. 14C-activity in solutions was directly determined by liquid scintillation counting. Unextractable soil residues were determined by combustion.The nature of methanolic 14C-residues was determined by thin layer and high performance liquid chromatographic analysis. Results Under aerobic conditions 10%-14% of applied dose was mineralized during 90 d irrespective of soil type. The soil extractable pesticide residues decreased with time and the bound residues gradually increased. The highest binding capacity of about 26%-29% was observed in clay soil under aerobic conditions after 90 d. A good balance sheet was obtained and the percentage recovery was generally between 91% and 100%. Conclusion The mineralization of 2,4-D in clay soil was higher than that in clay loam soil under anaerobic conditions.Under aerobic conditions, the soil type had no influence on mineralizaion capacity of 2,4-D during 90 d. The soil binding increased with time whereby the extractable 14C-residues simultaneously decreased.Chromatographic analysis of the methanol extractable 14C-residues of soils revealed the presence of 2,4-D as a main product together with 2,4-dichlorophenol.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions

Funds:  This work was supported by FAO/IAEA-division for its fmancial support

Abstract: Obiectives To study the mineralization of 2,4-D in clay and clay loam Egyptian soils under subtropical conditions over a period of 90 d. Methods Using 14C-ring labelled pesticide, laboratory studies under aerobic and anaerobic conditions were conducted. 14C-activity in solutions was directly determined by liquid scintillation counting. Unextractable soil residues were determined by combustion.The nature of methanolic 14C-residues was determined by thin layer and high performance liquid chromatographic analysis. Results Under aerobic conditions 10%-14% of applied dose was mineralized during 90 d irrespective of soil type. The soil extractable pesticide residues decreased with time and the bound residues gradually increased. The highest binding capacity of about 26%-29% was observed in clay soil under aerobic conditions after 90 d. A good balance sheet was obtained and the percentage recovery was generally between 91% and 100%. Conclusion The mineralization of 2,4-D in clay soil was higher than that in clay loam soil under anaerobic conditions.Under aerobic conditions, the soil type had no influence on mineralizaion capacity of 2,4-D during 90 d. The soil binding increased with time whereby the extractable 14C-residues simultaneously decreased.Chromatographic analysis of the methanol extractable 14C-residues of soils revealed the presence of 2,4-D as a main product together with 2,4-dichlorophenol.

S.M.A.D.ZAYED, M.FARGHALY, H.TAHA. Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions[J]. Biomedical and Environmental Sciences, 2002, 15(4): 306-314.
Citation: S.M.A.D.ZAYED, M.FARGHALY, H.TAHA. Mineralization of 14C-ring Labelled 2,4-D in Egyptian Soils Under Aerobic and Anaerobic Conditions[J]. Biomedical and Environmental Sciences, 2002, 15(4): 306-314.

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