Determination and study on degradation dynamics of fungicide validamycin a residue in soil using pre-column derivatization and capillary gas chromatography |
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Authors: | Pengjun Xu Shuren Jiang Bu Tao Hongyan Zhang |
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Institution: | (1) Department of applied chemistry, College of Science, China Agricultural University, Beijing, 100094, P. R. China;(2) College of Plant Protection, Hebei Agricultural University, Baoding, 071001, P. R. China |
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Abstract: | A method for determining validamycin A residue in soil utilizing pre-column derivatization and gas chromatography was developed.
Validamycin A was extracted from soil samples by 10% ammonia solution without additional clean-up step and then was derivatized
with N,O-bis(trimethylsilyl)acetamide. Derivative of validamycin A was analyzed by gas chromatography on a capillary column.
The method showed good linearity in the range of 4.4–142.0 mg/L (r
2 = 0.9997). The average recoveries were 98.82 and 98.61% with relative standard deviations 1.95 and 2.87% at spiking levels
0.2 and 2.0 mg/kg, respectively. The limit of detection of validamycin A in soil was 0.2 mg/kg. The degradation dynamics of
validamycin A in soil was studied. The result shows that validamycin A degradation in soil in the open field in Beijing suburb
can be described by the equation c = 6.6109e
−0.0196t
; the half-life is 35.4 h.
The article is published in the original. |
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Keywords: | |
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