[Safe use of carbendazim in GAP of Atractylodes macrocephala].
OBJECTIVE
To study the residue of in roots of Atractylodes macrocephalal and in soil.


METHODS
Samples were extracted with methanol. The extracts were cleaned up by liquid-liquid extraction and detected by HPLC.


RESULTS
Repeatability and accuracy of the method was verified by fortified recovery at 0.01, 0.05, 0.1, 0.2 mg x kg(-1) levels. Average recovery were 86.1%-98.3% and RSD were 1.0%-6.5% in root and soil. A. macrocephala was treated with two dosage of carbendazim during growing. Results of field test showed that the half lives of carbendazim were 6.51-7.98 d in cultivated soil, 4.51-6.50 d in roots, separately. After sample was preliminarily processed, the residue of dried samples was 0.042-0.433 mg x kg(-1), higher than the fresh samples.


CONCLUSIONS
If 0.2 mg x kg(-1) is recommended as the MRL (maximum residues limited) of carbendazim in the roots of A. macrocephala, it is suggested that the dose of 0.675 kg a.i. x hm(-1) carbendazim is sprayed twice a year, and carbendazim should not be used within 21 days before the harvest.
Lin
Jian
J
Pesticide Environmental Toxicology Research Institute, Zhejiang University, Hangzhou 310029, China.
Wei
Houdao
H
Wang
Tianyu
T
Wu
Jialun
J
Xue
Jian
J
D000383:Agriculture / Q000379:methods; D031174:Atractylodes / Q000737:chemistry* / Q000187:drug effects; D001562:Benzimidazoles / Q000032:analysis* / Q000494:pharmacology; D002219:Carbamates / Q000032:analysis* / Q000494:pharmacology; D004350:Drug Residues / Q000032:analysis* / Q000494:pharmacology; D005659:Fungicides, Industrial / Q000032:analysis* / Q000494:pharmacology; D018517:Plant Roots / Q000737:chemistry / Q000187:drug effects; D011786:Quality Control; D012987:Soil / Q000032:analysis
D001562:Benzimidazoles; D002219:Carbamates; D005659:Fungicides, Industrial; D012987:Soil; C006698:carbendazim