1,1,1-三[1'-(2'-氧杂-4'-氧代-5'-氮杂-5'-甲基)十二烷基]丙烷锂离子选择电极的研制

PVC membrane lithium ion-selective electrode based on 1, 1, 1-tris[1'-(2'-oxa-4'-oxo-5'-aza-5'-methyl)dodecyl] propane

研究了各种增塑剂和添加剂对1,1,1-三[1′-(2′-氧杂-4′-氧代-5′-氮杂-5′-甲基)十二烷基]丙烷为中性载体的 PVC 膜锂电极性能的影响。结果表明,磷酸三酯类对锂有良好的选择性。以 TEHP为增塑剂的锂电极线性响应范围是4×10^(-5)～10^(-1)mol·dm^(-3)(LiCl)。选择系数 K(?)是5×10^(-2),K(?)是5×10^(-3),K(?)是7×10^(-5),K(?)是3×10^(-3)。适量添加剂 TOPO 的加入可使 K(?)略有减小。膜内加入少量的 TOPO、KTPB 或 LiClO_4能降低膜的内阻,但随着膜中 TOPO 和 KTPB 含量的增加,电极性能明显变差。

The effects of plasticizers and related addi-tives on the performance of PVC membranelithium electrode based on 1,1,1-tris[1′-(2′-oxa-4′-oxo-5′-aza-5′-methyl)dodecyl]propanewere investigated.It showed that phosphoric tri-esters have a good selectivity for lithium.Thelinear response range of lithium electrode plasti-cized by TEHP is from 4×10^(-5) to 10^(-1)mol·dm^(-3)(LiCl).K_(Li.na)^(pot) is 5×10^(-2),K_(Li3k)^(pol) is 5×10^(-3),K_(Li,Mg)^(pot)is7×10^(-5),and K_(Li,Ca)^(pot) is 3×10^(-3).Optimum additionof TOPO will lower a bit of the K_(Li,Na)^(pot).Theinternal resistance of the membrane will be low-ered by the addition of TOPO,KTPB or LiClO_4,but the electrode performance decreases obviouslyin proportion to the increasing content of TOPOor KTPB in the membrane.