To measure pH in platelet concentrates, blood gas analysers with different calibration principles may be used. In this study, variances observed in pH measurements with two types of blood gas analysers were investigated. pH was measured in crystalloid solutions (platelet additive solution (PAS-II), phosphate-buffered solutions) and two types of platelet concentrates (containing 100% plasma, or ...

We have calculated gastric intramucosal pH (pHi) from Trip catheter saline tonometered samples in two patients undergoing ventilation using four different sampling techniques, each repeated five times. pHi was calculated from measurement of PCO2 in tonometered saline (TCO2). TCO2 was measured immediately, and then at 6-min intervals for 30 min. Variation in measurement was greatest for capped s...

64cc-1-2-06

Quantification of a pH change that was observed over the course of the transesterification reaction that converts vegetable oil to biodiesel may provide a simple method to monitor the reaction. Transesterification of canola oil at 6:1 methanol to oil ratio with 0.5 wt.% KOH as catalyst was studied at 25, 35, and 45 °C. Reaction conversion was correlated to pH measurements and the results were s...