[Objective] The paper was to detect the residue of buprofezin in citrus and soil.[Method] Gas chromatography（GC）method was used to measure the residue of buprofezin in citrus and soil.[Result] The average recovery r...[Objective] The paper was to detect the residue of buprofezin in citrus and soil.[Method] Gas chromatography（GC）method was used to measure the residue of buprofezin in citrus and soil.[Result] The average recovery rate of buprofezin in entire citrus fruit was 96.17%-97.38%,and the variation coefficient was 6.10%-9.07%;the average recovery rate in pulp was 95.24%-105.46%,and the variation coefficient was 3.30%-6.01%;the average recovery rate in peel was 88.76%-93.64%,and the variation coefficient was 5.12%-6.27%;the average recovery rate in soil was 97.79%-104.3%,and the variation coefficient was 2.45%-9.21%.The degradation dynamics and the final residue results of buprofezin in citrus and soil showed that the degradation half-lives in citrus in Changsha（Hunan）,Hangzhou（Zhejiang）and Guiyang（Guizhou）were 7.65,7.64 and 8.40 d,and the degradation half-lives in soil in three places were 13.75,9.97 and 10.18 d,respectively.[Conclusion] When 25% buprofezin SC watered agent were sprayed in citrus fruits for 2-3 times according to the recommended dose of 166.7-250.0 mg/L,the safe period of buprofezin in citrus could be set as 14 d.展开更多
The four treatments of spraying water the control, spraying before bagging, spraying after bagging, spraying without bagging were conducted by spraying 38% of the mixed suspension agent of imidacloprid and buprofezin,...The four treatments of spraying water the control, spraying before bagging, spraying after bagging, spraying without bagging were conducted by spraying 38% of the mixed suspension agent of imidacloprid and buprofezin, and high performance liquid chromatography （HPLC） method was used to test the imidacloprid and buprofezin residues on mango. The results showed that in 0.05-0.5 mg/kg adding level, the average recovery rate of imidacloprid and buprofezin was 82.6-93.8%, and 101.4-104.2%, respectively, and the relative deviation （RSD） was 1.9-4.5%, 9.3-15.6%, respectively. The minimum detectable amounts of both imidacloprid and buprofezin on mango were 0.01 mg/kg. The half-life periods of imidacloprid under the treatments of spraying before bagging, spraying after bagging and spraying without bagging were 16.74, 6.38, and 8.10 d, respectively, and the half-life periods of buprofezin under the treatments of spraying before bagging and spraying without bagging were 9.72 and 9.23 d, respectively. The residual of buprofezin was low in the treatment of spraying after bagging, and the amount detected in the 3rd day had already below the detectable limit. Bagging treatment reduced the digestion rate of 2 kinds of pesticides in mango, and imidacloprid had strong systemic in mango.展开更多
The biological half-life and final residue levels of buprofezin and teflubenzuron were examined in peaches over a 14-day cultivation period. The residue levels of buprofezin and teflubenzuron were analyzed by chromato...The biological half-life and final residue levels of buprofezin and teflubenzuron were examined in peaches over a 14-day cultivation period. The residue levels of buprofezin and teflubenzuron were analyzed by chromatographic method with recovery ranging from 84.0% to 96.6%. The biological half-lives of buprofezin andteflubenzuron were 4.88 and 11.49 days at the standard dose, and 4.40 and 10.86 days at a triple dose, respectively. The initial concentration of buprofezin exceeded the maximum residue limit (MRL) set in Korea, but the concentration decreased to below the MRL within 6 days after application. The initial and persisting concentrations of teflubenzuron were all below the prescribed MRL. The final residue levels of buprofezin and teflubenzuron were 0.17 and 0.10?mg·kg﹣1 following a standard single dose, and 0.20 and 0.23 mg·kg﹣1 following a triple dose, respectively. The final re-sidue levels of buprofezin and teflubenzuron were also compared with the good agricultural practices standards of the United States and Italy.展开更多
A new kind of co-crystal of buprofezin(C(16)H(24)FN3OS) with hydrofluoric acid has been prepared through evaporation technique. It crystallizes in the triclinic space group P1, with a = 9.9733(8), b = 10.3460(9), c = ...A new kind of co-crystal of buprofezin(C(16)H(24)FN3OS) with hydrofluoric acid has been prepared through evaporation technique. It crystallizes in the triclinic space group P1, with a = 9.9733(8), b = 10.3460(9), c = 10.5739(12) ?, a = 68.655(9), b = 73.291(9), g = 66.738(8)o, V = 920.34(17) ?~3, Mr = 325.44, Dc = 1.174 g/cm^3, Z = 2, F(000) = 348, m = 0.190 mm^(-1), the final GOOF = 1.042, R = 0.0485 and wR = 0.1167. Single-crystal X-ray diffraction, XRPD, DSC, TGA, Hirshfeld surface analysis, Raman spectroscopy and FT-IR were used to characterize the co-crystal. It has a twodimensional plane structure, and the intermolecular interactions of co-crystal are mainly H–F×××H, H–O×××H and H–O×××H. Thermology study further confirmed that co-crystal has stronger thermal stability and higher melting point than buprofezin, and it has stronger water solubility. The results show that this co-crystal is valuable for the study of residual activity and application effects of buprofezin.展开更多
基金Supported by Pesticide Testing Project of Ministry of Agriculture(NYCL20080368)~~
文摘[Objective] The paper was to detect the residue of buprofezin in citrus and soil.[Method] Gas chromatography（GC）method was used to measure the residue of buprofezin in citrus and soil.[Result] The average recovery rate of buprofezin in entire citrus fruit was 96.17%-97.38%,and the variation coefficient was 6.10%-9.07%;the average recovery rate in pulp was 95.24%-105.46%,and the variation coefficient was 3.30%-6.01%;the average recovery rate in peel was 88.76%-93.64%,and the variation coefficient was 5.12%-6.27%;the average recovery rate in soil was 97.79%-104.3%,and the variation coefficient was 2.45%-9.21%.The degradation dynamics and the final residue results of buprofezin in citrus and soil showed that the degradation half-lives in citrus in Changsha（Hunan）,Hangzhou（Zhejiang）and Guiyang（Guizhou）were 7.65,7.64 and 8.40 d,and the degradation half-lives in soil in three places were 13.75,9.97 and 10.18 d,respectively.[Conclusion] When 25% buprofezin SC watered agent were sprayed in citrus fruits for 2-3 times according to the recommended dose of 166.7-250.0 mg/L,the safe period of buprofezin in citrus could be set as 14 d.
基金Supported by the Special Fund for Agro-scientific Research in Public Interest(201203092-4-2)~~
文摘The four treatments of spraying water the control, spraying before bagging, spraying after bagging, spraying without bagging were conducted by spraying 38% of the mixed suspension agent of imidacloprid and buprofezin, and high performance liquid chromatography （HPLC） method was used to test the imidacloprid and buprofezin residues on mango. The results showed that in 0.05-0.5 mg/kg adding level, the average recovery rate of imidacloprid and buprofezin was 82.6-93.8%, and 101.4-104.2%, respectively, and the relative deviation （RSD） was 1.9-4.5%, 9.3-15.6%, respectively. The minimum detectable amounts of both imidacloprid and buprofezin on mango were 0.01 mg/kg. The half-life periods of imidacloprid under the treatments of spraying before bagging, spraying after bagging and spraying without bagging were 16.74, 6.38, and 8.10 d, respectively, and the half-life periods of buprofezin under the treatments of spraying before bagging and spraying without bagging were 9.72 and 9.23 d, respectively. The residual of buprofezin was low in the treatment of spraying after bagging, and the amount detected in the 3rd day had already below the detectable limit. Bagging treatment reduced the digestion rate of 2 kinds of pesticides in mango, and imidacloprid had strong systemic in mango.
文摘The biological half-life and final residue levels of buprofezin and teflubenzuron were examined in peaches over a 14-day cultivation period. The residue levels of buprofezin and teflubenzuron were analyzed by chromatographic method with recovery ranging from 84.0% to 96.6%. The biological half-lives of buprofezin andteflubenzuron were 4.88 and 11.49 days at the standard dose, and 4.40 and 10.86 days at a triple dose, respectively. The initial concentration of buprofezin exceeded the maximum residue limit (MRL) set in Korea, but the concentration decreased to below the MRL within 6 days after application. The initial and persisting concentrations of teflubenzuron were all below the prescribed MRL. The final residue levels of buprofezin and teflubenzuron were 0.17 and 0.10?mg·kg﹣1 following a standard single dose, and 0.20 and 0.23 mg·kg﹣1 following a triple dose, respectively. The final re-sidue levels of buprofezin and teflubenzuron were also compared with the good agricultural practices standards of the United States and Italy.
基金supported by the National Natural Science Foundation of China(51673040)the Natural Science Foundation of Jiangsu Province(BK20180366,BK20171357)+3 种基金the Fundamental Research Funds for the Central Universities(2242019k30042)Scientific Innovation Research Foundation of College Graduate in Jiangsu Province(KYLX160266)a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PADA)(1107047002)Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China(BA2018045)。
文摘A new kind of co-crystal of buprofezin(C(16)H(24)FN3OS) with hydrofluoric acid has been prepared through evaporation technique. It crystallizes in the triclinic space group P1, with a = 9.9733(8), b = 10.3460(9), c = 10.5739(12) ?, a = 68.655(9), b = 73.291(9), g = 66.738(8)o, V = 920.34(17) ?~3, Mr = 325.44, Dc = 1.174 g/cm^3, Z = 2, F(000) = 348, m = 0.190 mm^(-1), the final GOOF = 1.042, R = 0.0485 and wR = 0.1167. Single-crystal X-ray diffraction, XRPD, DSC, TGA, Hirshfeld surface analysis, Raman spectroscopy and FT-IR were used to characterize the co-crystal. It has a twodimensional plane structure, and the intermolecular interactions of co-crystal are mainly H–F×××H, H–O×××H and H–O×××H. Thermology study further confirmed that co-crystal has stronger thermal stability and higher melting point than buprofezin, and it has stronger water solubility. The results show that this co-crystal is valuable for the study of residual activity and application effects of buprofezin.
