Níveis residuais de BHC em amendoas e na superfície externa dos frutos de cacau a diferentes intervalos entre a aplicacao e a colheita
Cacao pod surface and cacao beans were analysed for the presence of BHC (HCH) residues at different intervals between its application and fruit harvesting. The experiment was carried out during a relatively dry period and was repeated in a rainy period. For identification and quantification of the residues, gas chromatography techniques were used. On the pod the residual level during the dry period fell from 0.1 to 0.05 and 0.01 ppm within 8 and 30 days respectively and in the beans from 0.1 to 0.05 ppm within 8 days. During the rain period the levels fell from 0.08 to 0.02 ppm on the pod surface and from 0.6 to 0.07 in the beans within 8 days. For both, rainy and dry periods, a significant increase in the levels in the beans was observed 30 days after the BHC application. This can be attributed to absorption, translocation and accumulation in the beans of the insecticide remaining on the aerial part of the plant and in the soil.
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| Format: | biblioteca |
| Published: |
1985
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| Subjects: | THEOBROMA CACAO, FRUTO, SEMILLA, CASCARAS DE CACAO, INSECTICIDAS, RESIDUOS, COMPOSICION QUIMICA, ANALISIS QUIMICO, CROMATOGRAFIA DE GASES, |
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| Summary: | Cacao pod surface and cacao beans were analysed for the presence of BHC (HCH) residues at different intervals between its application and fruit harvesting. The experiment was carried out during a relatively dry period and was repeated in a rainy period. For identification and quantification of the residues, gas chromatography techniques were used. On the pod the residual level during the dry period fell from 0.1 to 0.05 and 0.01 ppm within 8 and 30 days respectively and in the beans from 0.1 to 0.05 ppm within 8 days. During the rain period the levels fell from 0.08 to 0.02 ppm on the pod surface and from 0.6 to 0.07 in the beans within 8 days. For both, rainy and dry periods, a significant increase in the levels in the beans was observed 30 days after the BHC application. This can be attributed to absorption, translocation and accumulation in the beans of the insecticide remaining on the aerial part of the plant and in the soil. |
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