Transcription of thermo scei nficti
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thermo scei nficti
PH measurement handbookthermo scientificpH theory 4pH electrode theory 4pH versus temperature theory 5pH electrode selection guide 6 thermo Scientific pH electrode families 7pH electrode features 8pH electrode recommendations by sample 11pH electrode catalog numbers by sample type 12pH electrode summary table 14pH electrode operation guide 16pH electrode preparation 16 thermo Scientific pH buffers and storage solutions 16pH electrode calibration 17 Calibration recommendations 17 Three-buffer calibration procedure 17pH electrode measurements 19 Measurement recommendations 19 Sample requirements 20pH measurement procedure 20pH electrode maintenance 20 Filling and draining a refillable pH electrode 20 ContentspH electrode storage 22 Short-term electrode storage (up to one week) 22 Long-term electrode storage (more than one week) 22pH elect
the pH reading as displayed on the meter. Known pH standards (buffers) traceable to NIST standards are referenced to calibrate the system prior to any readings. yheor Ht p Electrode behavior is described by the Nernst equation: E = Eo + (2.3 RT/nF) log aH+ E is the measured potential from the sensing electrode,
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