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KMID : 0903519780210020071
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1978 Volume.21 No. 2 p.71 ~ p.80
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A Study on the Evolution of 3,4 - DCA and TCAB in Some Selected Soils(Part Ⅱ)
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Abstract
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In an attempt to elucidate the fate of 3, 4-DCA and TCAB in various French soils, uniformly ^(14)C-ring-labeled 3,4-DCA and TCAB mere utilized and the following results obtained.
1) The rate of breakdown of ^(14)C-3,4-DCA into ^(14)CO₂ was relatively higher in the early stage than that in the later stage. In 6 months of incubation in alkaline soil (pH 7.9), the rate was as high as 6.5% at dose 1 (1.5 ppm) and as low as 1.92% at
dose 2(94 ppm), whereas in organic acid soil (pH 5. 5) the rate was 4.91% at dose 1 and 4.24% at dose 2, respectively, without making any great difference between the two levels.
2) At dose 1, 47.70% of the initial radioactivity of ^(14)C-3,4-DCA was bound to soil in organic acid soil and 29.49% bound in alkaline soil, whereas at dose 2, 38.40% in organic acid soil and 20.30% in alkaline soil, respectively.
3) The amount of formation of ^(14)C-TCAB from 14C-3, 4-DCA seems to depend largely on the concentration of 3, 4-DCA applied rather than on soil types. At dose 2, the amount was 50% of the total radioactivity extracted in organic acid soil and 30% in alkaline soil, corresponding to 1.8% and 1.4% of the initial radioactivity applied to soil, respectively. Cis-TCAB also seemed to be formed at dose 2 in both soils. Meanwhile, at dose 1, even though ^(14)C-TCAB was detected in trace on tlc and glc in both soils, the amount does not exceed 2 to 3% of the radioactivity extracted, corresponding to 0.05 to 0.1% of the initial radioactivity.
4) The rate of breakdown of ^(14)C-TCAB into ^(14)CO₂ ranged from 0.05 to 0.20% in all the four soils. Most of the applied ^(14)C-TCAB remained intact after 3 months, not producing any detectable metabolites.
5) The fact that much more ^(14)C-TCAB was adsorbed to alkaline soil than to the other soils strongly indicates that in alkaline condition trans-isomer was converted tocisisomer which has the higher adsorption affinity than the former.
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