One-component Room Temperature Vulcanizing-Type Silicone Rubber-Based Solid-State Carbonate Ion Selective Electrode

摘要

We developed a miniaturized solid-state carbonate ion-selective electrode (carbonate ISE) based on one-component room temperature vulcanizing type silicone rubber 730 (730 RTV) without adding plasticizer to the matrix.The optimized carbonate ion selective membrane is prepared with 85.8 wt% of 730 RTV,11.1 wt% of tri-fluoroacetyl-p-decylbenzene (TFADB),and 3.1 wt% of tridodecyl-methylammonium chloride (TDMAC1).This carbonate ISE exhibited excellent potentiometric properties (i.e.,slope:26.3 mV/dec;selectivity:logK_(TCO2,Cr)~(pot)=-4.00 and logK_(TCO_2,Sal~-)~(pot)=1.69;and detection limit for TCO_2:4.0x10~(-4) M).In addition,the early potentiometric properties of the solid-state sensor with optimized membrane composition were not deteriorated for more than 60 days.