In 1980, the research program in pH was re-established at the National Bureau of Standards (NBS). This report describes the state of this research, as well as the state of the NBS pH standards. The thermodynamic definition and the determination of pH are elaborated. The problems of liquid junction potentials encountered in the practical determination of pH are discussed. The goal of the researc...

Background: The RightLevelpHTM indicator is a new device designed to measure pH of gastric aspirate obtained via nasogastric tube while minimizing exposure of the operator. Study Objectives: In vivo and in vitro validation of the RightLevelpHTM indicator. Methods: Patients (23) undergoing general anesthesia had placement of a nasogastric tube and gastric pH electrode catheter following endotrac...

Background: The RightSpotpHTM indicator is a new device designed to facilitate pH-based confirmation of nasogastric tube placement while minimizing exposure of the operator to nasogastric contents. Study objectives: In vivo and in vitro validation of the RightSpotpHTM indicator. Findings: Patients (23) undergoing general anesthesia had placement of a nasogastric tube and gastric pH electrode ca...

BACKGROUND The RightSpotpH™ indicator is a new device designed to facilitate pH-based confirmation of nasogastric tube placement while minimizing exposure of the operator to nasogastric contents. STUDY OBJECTIVES In vivo and in vitro validation of the RightSpotpH™ indicator. FINDINGS Patients (23) undergoing general anesthesia had placement of a nasogastric tube and gastric pH electrode cat...

Vaginal pH measurement is a screening method of vaginal infection in pregnancy. We tested two different methods of pH determination. In freshly taken vaginal fluid measurements were carried out with special pH indicator strips and pH micro glass electrode. About 100 microliters of vaginal fluid is enough when pH indicator strips are used, and 200 microliters when the micro electrode is used. Th...