期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
卷 83, 期 5, 页码 433-442出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/0306731031000104722
关键词
diflubenzuron; pesticides; conifer forest; liquid chromatography; diode-array detection; electrochemical detection
Dimilin 45 ODC (diflubenzuron) was applied in a Mediterranean-climate conifer forest, near Vitoria, Basque Country, Spain. Pine needles were collected at post-treatment 5-day intervals for analysis of the diflubenzuron residues. A liquid chromatography method with on-line diode-array and electrochemical detection was developed for the determination of the pesticide diflubenzuron and its main metabolites: 2,6-diflurobenzamide, 4-chlorophenylurea, 4-chloroacetanilide, 4-chloroaniline and N -methyl-4-chloroaniline in forestry matrices. Aerial application at 56.3 g AI ha(-1) resulted in deposition levels of the insecticide of 1080 ng g(-1). Within 40-65 days following treatment, 51-73% of the insecticide had been removed from the foliage. During this period, the concentration of diflubenzuron was higher than 295 ng g(-1). The only metabolite detected was 2,6-difluorobenzamide and this persisted on foliage until the first rainfalls occurred. An empirical mathematical correlation was found to express the influence of rainfall, solar radiation and temperature on the persistence of the insecticide.
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