Dissipation and residues of nicosulfuron in corn and soil under field conditions.
A simple, sensitive method for the analysis of nicosulfuron in corn and soil was developed. Samples were extracted with acetonitrile: water (2:3, V/V) mixture and partitioned with dichloromethane. After concentration, the soil sample extracts were detected using high performance liquid chromatography-ultraviolet detector (HPLC-UVD), and the corn sample extracts were detected using high performance liquid chromatography-mass spectrometry detector (HPLC-MSD). The fortified recoveries at 0.05-1.0 mg/kg were 79.7%-115.8%, with the relative standard deviation of 1.40%-13.8%. The limit of detection of the analytical method was 0.05 ng at a signal-to-noise ratio of 3, and the limit of quantification was 0.05 mg/kg for both corn and soil. The dissipation dynamics of nicosulfuron in the field trials in Beijing and Changchun were investigated. The half-lives of nicosulfuron in corn plants were 0.73 days in Beijing and 0.53 days in Changchun, both with a dissipation rate of 90% over 7 days after application. The half-lives in soil were 13.64 days both in Beijing and in Changchun with a dissipation rate of 90% over 21 days. Low residues and short half-life in corn suggested that nicosulfuron could be safely used in corn crops with the suitable dosage and application.
Wu
Qiong
Q
College of Science, China Agricultural University, 100193 Beijing, People's Republic of China.
Chen
Xiaoxu
X
Xu
Yanjun
Y
Han
Lijun
L
D000097:Acetonitriles / Q000737:chemistry; D002681:China; D002851:Chromatography, High Pressure Liquid; D002947:Cities; D006207:Half-Life; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D013058:Mass Spectrometry; D008752:Methylene Chloride / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis*; D011725:Pyridines / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D012997:Solvents / Q000737:chemistry; D013453:Sulfonylurea Compounds / Q000032:analysis*; D013997:Time Factors; D014867:Water / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry*
D000097:Acetonitriles; D006540:Herbicides; D010573:Pesticide Residues; D011725:Pyridines; D012987:Soil; D012989:Soil Pollutants; D012997:Solvents; D013453:Sulfonylurea Compounds; D014867:Water; D008752:Methylene Chloride; C416723:nicosulfuron; C032159:acetonitrile