Tests of the suitability of four solutions as analytical quality control samples for the determination of pH in low ionic strength water samples are reported. The long-term standard deviation of results for all solutions was less than 0.04 pH unit for 14 observations made over 7 weeks by two operators using commercial electrodes.
M. J. Gardner, R. Gill and J. E. Ravenscroft, Analyst, 1990, 115, 371 DOI: 10.1039/AN9901500371
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