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Plant experiments on the bioavailability of unextracted [carbonyl-14C]methabenzthiazuron residues from soil


Plant experiments on the bioavailability of unextracted [carbonyl-14C]methabenzthiazuron residues from soil



Journal of Agricultural and Food Chemistry 28(1): 122-125



ISSN/ISBN: 0021-8561

PMID: 7358924

DOI: 10.1021/jf60227a006

The extractability of methabenzthiazuron [an herbicide] residues from soil decreases with time after application. In this study the bioavailability of this soil bound or adsorbed fraction was investigated using maize plants. A sandy soil and [carbonyl-14C]methabenzthiazuron (10 ppm) were incubated at 22.degree. C and 65% of the water holding capacity for 111 days. After extractions with H2O/acetone/ethyl acetate/chloroform, unextracted, bound residues remaining in this soil amounted to 41% applied. Plant uptake studies were conducted in special experimental pots. After 29 days the maize shoots contained 0.7% of the radioactivity originally applied to the soil before incubation in comparison to 2.2% from the incubated soil not extracted. When the [carbonyl-14C]methabenzthiazuron was added to the soil immediately before the plant experiment, about 4% of the radioactivity was found in the shoots. The plant availability of the unextracted radiocarbon, as compared with the extractable portion, decreased to about 1/3 and in comparison with the availability after direct methabenzthiazuron application to about 1/6. Desorption studies with water showed similar ratios.

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Accession: 016675226

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Related references

Aged and bound herbicide residues in soil and their bioavailability. Part 2: Uptake of aged and non-extractable (bound) [carbonyl-14C]methabenzthiazuron residues by maize. Journal of Environmental Science and Health. Part. B Pesticides Food Contaminants and Agricultural Wastes 22(6): 623-642, 1987

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