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Title: EFFECT OF TEMPERATURE, ORGANIC AMENDMENT RATE, AND MOISTURE CONTENT ON THE DEGRADATION OF 1,3-DICHLOROPROPENE IN SOIL

Author
item Dungan, Robert - Rob
item GAN, JIANYING - U OF CA, RIVERSIDE
item Yates, Scott

Submitted to: BARC Poster Day
Publication Type: Abstract Only
Publication Acceptance Date: 4/22/2003
Publication Date: 4/22/2003
Citation: Dungan, R.S., Gan, J., Yates, S.R. 2003. Effect of temperature, organic amendment rate, and moisture content on the degradation of 1,3-dichloropropene in soil [abstract]. BARC Poster Day.

Interpretive Summary:

Technical Abstract: 1,3-Dichloropropene (1,3-D), which consists of two isomers, (Z)- and (E)-1,3-D, is considered a viable alternative to methyl bromide, however, atmospheric emission of 1,3-D is often associated with the deterioration of air quality. To minimize environmental impacts of 1,3-D, emission control strategies are in need of investigation. One approach to reduce 1,3-D emissions is to accelerate its degradation by incorporating organic amendments into the soil surface. In this study, we investigated the ability of four organic amendments to enhance the rate of degradation of (Z)- and (E)-1,3-D in a sandy loam soil. Degradation of (Z)- and (E)-1,3-D was well described by first-order kinetics and rates of degradation were similar between the two isomers. Of the organic amendments tested, composted steer manure (SM) was the most reactive. The half-life of the (Z)- and (E)-isomer in unamended soil at 20oC was 6.3 d; those of 5% SM-amended soil were 1.8 and 1.9 d, respectively. At 40oC, the half-life of both isomers in 5% SM-amended soil was 0.5 d. Activation energy values for amended soil at 2, 5 and 10% SM were 56.5, 53.4 and 64.5 kJ mol-1, respectively. At 20oC, the contribution of degradation from biological mechanisms was largest in soil amended with SM, but chemical mechanisms accounted for greater than 58% of the (Z)- and (E)-1,3-D degradation. The effect of temperature and amendment rate upon degradation should be considered when describing the fate and transport of 1,3-D isomers in soil. Use of organic soil amendments appears to be a promising method to enhance fumigant degradation and reduce volatile emissions.