1.Endemic situation of acute schistosomiasis in Tongling County, 1990 -2008
Longzhu HE ; Deyin CHEN ; Jisheng AN ; Shubing GAO
Chinese Journal of Schistosomiasis Control 2009;21(6):456,463-
The endemic situation of acute schistosomiasis in Tongling County from 1990 to 2008 showed the incidence rate of acute schistosomiasis was declining year by year, and the endemic situation was controlled effectively.
2.Determination of Cyromazine and Dicyclanil Residues on Greasy Wool by High Performance Liquid Chromatography
Yuanmu FAN ; Xuejun YU ; Xiaojun GU ; Juyi YIN ; Yajun QIU ; Shubing CHEN ; Jie CHEN ; Jia ZHAN ; Xiaoyu HE ; Jun CHEN ; Shaotang HUANG
Chinese Journal of Analytical Chemistry 2010;38(1):113-116
A method for the determination of cyromazine and dicyclanil residues on greasy wool was developed with HPLC and confirmed with HPLC-MS/MS.The cyromazine and dicyclanil residues on greasy wool were extracted with 1% trichloroacetic acid solution with ultrasonic, and cleaned up by MCX SPE column.The HPLC separation was performed on a Hypersil NH_2 using water-acetonitrile (V/V) as the mobile phase with gradient elution and detected at the wavelength of 214 nm.The corroboration method of HPLC-MS/MS was used with electro-spray ionization of positive ion mode.The [ M + H ]~+ and characteristic ions of dicyclanil were m/z 191.0, 150.0 and 163.0, and cyromazine were m/z 167.0, 85.0 and 125.0.The linear ranges of cyromazine and dicyclanil were 0.05-5.0 mg/L.There were good linear relationships between the peak area and concentration in the linear range.The correlation coefficient was 0.9999.The detection limit of cyroma zine was 0.02 mg/kg, and dicyclanil was 0.01 mg/kg.The average recoveries of cyromazine and the dicycla nil were 95.0%-99.9% and 83.6%-92.2%, respectively.