Chuanshan Yu

Publications (3)4.86 Total impact

• Article: Spinach or amaranth may represent highest residues of four pesticides with open field application on six leaf vegetables.

  Sufang Fan, Fengzu Zhang, Kailin Deng, Chuanshan Yu, Shaowen Liu, Pengyue Zhao, Canping Pan
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  ABSTRACT: To select representative crop among leaf vegetables which may contain the highest residue after fungicide，insecticide and insecticide uses, open field applications with metalaxyl, fluazifop-P-butyl, chlorpyrifos and lambda-cyhalothrin on six crops including pakchoi, rape, crown daisy, amaranth, spinach and lettuce were designed and conducted. In this study, a high-performance liquid chromatography and electrospray ionization-tandem mass spectrometry with multiple reaction monitoring was used to simultaneously determine metalaxyl and fluazifop-P-butyl residue in various samples, gas chromatograph with Electron Capture Detector was used to detect chlorpyrifos and lambda-cyhalothrin. The limits of quantification (LOQ) for metalaxyl, fluazifop-P-butyl, chlorpyrifos and lambda-cyhalothrin were established in the range of 0.001-0.01 mg kg-1 for all samples. It was shown that average recoveries ranged from 67.6-119.1% for all pesticides at spiked levels of 0.01-0.1 mg kg-1. In supervised field trials, the half-lives of metalaxyl, fluazifop-P-butyl, chlorpyrifos and lambda-cyhalothrin were in the range of 1.11-3.79 days, 1.11-2.27 days, 1.13-5.17 days, 1.77-6.24 days. It was also found that all pesticide residues in spinach and/or amaranth were higher than others after application. It's recommended that spinach or amaranth can be selected as representative crop in leaf vegetables in study of systemic fungicide，insecticides and insecticides with similarity as metalaxyl, fluazifop-P-butyl, chlorpyrifos and lambda-cyhalothrin.
  Journal of Agricultural and Food Chemistry 02/2013; · 2.82 Impact Factor
• Article: Spinach or Amaranth May Represent Highest Residue of Thiophanate-Methyl with Open Field Application on Six Leaf Vegetables.

  Sufang Fan, Pengyue Zhao, Fengzu Zhang, Chuanshan Yu, Canping Pan
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  ABSTRACT: To select representative crop among leaf vegetables which may contain the highest residue after fungicide uses, open field applications with thiophanate-methyl on six crops including pakchoi, rape, crown daisy, amaranth, spinach and lettuce were designed and conducted. In this study, a high-performance liquid chromatography and electrospray ionization-tandem mass spectrometry with selected reaction monitoring was used to simultaneously determine thiophanate methyl and its metabolite carbendazim residue in various samples. The limit of quantification for thiophanate methyl and carbendazim were established in the range of 0.005-0.01 mg kg(-1) for all samples. It was shown that recoveries ranged from 67.8 % to 102.3 % for thiophanate methyl, and 72.0 %-112.6 % for carbendazim at spiked levels of 0.01-0.1 mg kg(-1). It's found that thiophanate methyl converts to carbendazim very quickly. In supervised field trials, the half-lives of thiophanate methyl in six leaf vegetables were in the range of 1.26-2.65 days, and the half-lives of carbendazim were in the range of 2.53-4.28 days. It was also found that thiophanate methyl residue in spinach and amaranth was higher than others after application. It's recommended that spinach or amaranth can be selected as representative crop in leaf vegetables in study of systemic fungicides with similarity as thiophanate methyl.
  Bulletin of Environmental Contamination and Toxicology 12/2012; · 1.02 Impact Factor
• Article: Determination of six neonicotinoid insecticides residues in spinach, cucumber, apple and pomelo by QuEChERS method and LC-MS/MS.

  Fengzu Zhang, Yanjie Li, Chuanshan Yu, Canping Pan
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  ABSTRACT: A modified QuEChERS and LC-MS/MS method has been developed for the simultaneous determination of residues of six neonicotinoids in various crops, including spinach, cucumber, apple and pomelo. The method showed good linearity (R(2) ≥ 0.9995) and precision (RSD ≤ 14.0%). Average recoveries of the six neonicotinoids ranged between 73.7% and 103.8% at spiking levels 0.005, 0.1 and 1 mg kg(-1). The LODs and LOQs were in the ranges of 0.20-0.85 μg kg(-1) and 0.66-2.84 μg kg(-1), respectively. The method was satisfactorily validated for the analysis of 50 agricultural samples. Imidacloprid and imidaclothiz were detected at concentration levels ranging from 7 to 5.3 μg kg(-1).
  Bulletin of Environmental Contamination and Toxicology 03/2012; 88(6):885-90. · 1.02 Impact Factor