A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) se...A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) selenopropoxy] calix[4]arene, dioctyl phthalate and potassium tetrakis(4-chlorophenyl) borate. The response of the electrode is linear with a good Nernstian slope of 31.5 mV/decade over an Hg 2+ ion concentration range of 5.0×10 -9—5.0×10 -2 mol/L and a detection limit of 1.0×10 -9 mol/L. The response time to achieve a 95% steady potential for Hg 2+ detection is less than 30 s, and the electrode is suitable for use within the pH range of 2—4. The selectivity for Hg 2+ relative to several alkali, alkaline earth, transition and heavy metal ions is good. The mechanism of the potential response of this system was also discussed.展开更多
棘禾草螟绒茧蜂Apanteles chiloniponellae You et Wang是荻、芦主要蛀茎害虫棘禾草螟Chilo niponella幼虫期的寄生天敌,平均寄生率13.3％。此蜂在湖北一年发生5～6代,以幼虫在寄主老熟幼虫体内越冬。8月份室温下完成一代,平均历期为33....棘禾草螟绒茧蜂Apanteles chiloniponellae You et Wang是荻、芦主要蛀茎害虫棘禾草螟Chilo niponella幼虫期的寄生天敌,平均寄生率13.3％。此蜂在湖北一年发生5～6代,以幼虫在寄主老熟幼虫体内越冬。8月份室温下完成一代,平均历期为33.4天。成蜂多于8～10时和17～19时羽化,寿命平均为26天。卵产于寄主体壁下。寄生蜂茧的平均历期为4.75天。以棘禾草螟作寄主,每头寄主平均出蜂29头。茧的羽化率为66.3％。寄主被寄生后,始无明显症状,后期食量锐减甚至不取食,行动迟缓,体表发皱变黄。寄主除上述外,尚有芦螟Chilo luteellus和条螟Proceras venosata。此蜂在田间分布不均匀,不同苇田及同一苇田不同位置种群数量不同。展开更多
文摘A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) selenopropoxy] calix[4]arene, dioctyl phthalate and potassium tetrakis(4-chlorophenyl) borate. The response of the electrode is linear with a good Nernstian slope of 31.5 mV/decade over an Hg 2+ ion concentration range of 5.0×10 -9—5.0×10 -2 mol/L and a detection limit of 1.0×10 -9 mol/L. The response time to achieve a 95% steady potential for Hg 2+ detection is less than 30 s, and the electrode is suitable for use within the pH range of 2—4. The selectivity for Hg 2+ relative to several alkali, alkaline earth, transition and heavy metal ions is good. The mechanism of the potential response of this system was also discussed.
文摘棘禾草螟绒茧蜂Apanteles chiloniponellae You et Wang是荻、芦主要蛀茎害虫棘禾草螟Chilo niponella幼虫期的寄生天敌,平均寄生率13.3％。此蜂在湖北一年发生5～6代,以幼虫在寄主老熟幼虫体内越冬。8月份室温下完成一代,平均历期为33.4天。成蜂多于8～10时和17～19时羽化,寿命平均为26天。卵产于寄主体壁下。寄生蜂茧的平均历期为4.75天。以棘禾草螟作寄主,每头寄主平均出蜂29头。茧的羽化率为66.3％。寄主被寄生后,始无明显症状,后期食量锐减甚至不取食,行动迟缓,体表发皱变黄。寄主除上述外,尚有芦螟Chilo luteellus和条螟Proceras venosata。此蜂在田间分布不均匀,不同苇田及同一苇田不同位置种群数量不同。
