TY - JOUR AU - Spichiger-Keller, Ursula E. AB - Measurements of calcium ion activities with lately available Schott glass `LaSF35' as the multiple internal reflection element are presented. Use of the evanescent wave in absorption mode as well as corresponding data for the refractive index are shown. Looking from the backside at the membrane eliminates optical sample interferences and the crucial assumption of a homogeneous bulk optode can be verified by profiling into a controlled depth of the membrane. TI - Chemically selective optode membranes casted on multiple internal reflection elements of high refractive index JO - Proceedings of SPIE DO - 10.1117/12.168752 DA - 1994-02-15 UR - https://www.deepdyve.com/lp/spie/chemically-selective-optode-membranes-casted-on-multiple-internal-ziRWOxENIv SP - 124 EP - 130 VL - 2085 IS - 1 DP - DeepDyve ER -