必需重视特种禽类的免疫接种

必需重视特种禽类的免疫接种＠张献礼￥安徽省淮南市农业科学研究所＠孙立贤￥安徽省涡阳县高炉镇兽医站必需重视特种禽类的免疫接种■张献礼（安徽省淮南市农业科学研究所２３２００８）■孙立贤（安徽省涡阳县高炉镇兽医站２３３６６０）特种禽类的养殖，自改革开放以来，随着...     

茶碱PVC膜选择性电极的研究

In this Paper, PVC membrane Selective clectrodes are prepared for theophylline which are based on its ion-pair complexes with hexadecylt- rioctylammonium iodide (HTOA) , hexadecyltributyl-ammonium iodide (HTBA), hexadeeyltriophenylphosphonium iodide(HTPP), triphenyloctylphosphonium leoide(TPOP) and tri(p-tolyl) butylphosphonium iodide(TPTBP).The effects of the nature of associate counterions, the plastieizers and their concentrations in the membrane phase have been studied. The electrode based on theophylline-HTOA membrane has a sub-Nernstian response range from 2.0×10~2—6.3×10~(-5)mol/L,with an average slope of 48.0mV/pC. The limit of detection is 8.7×10~(-6)mol/L. The electrode responses were not affected by pH in the range 10-12. The potentiometric selectivity coefficients of various common inorganic and organic ions including those which are similar to theophylline in structure were determined. The Na_2CO_3-Na_2B_4O_7 buffer of pH 11 is selected as the background solution for potentiometric measurements. The electrode was used for determining the theophylline in pharmaceutical preparations with satisfactory results.