Abstract
Storage times of some common laboratory reagents have been determined. Solutions of 0.057N Na2S2O3 in 0.05N NaOH, 0.1N I2, 0.68N K2Cr2O7 in 12N H2SO4 and commercial pH 4.01 and 7.00 buffers keep with no apparent deterioration for at least 90 days. The deterioration of the Fehlings A and B solutions stored separately in the dark over a 96 day interval was not chemically significant. Significant deterioration was apparent in 0.1N NaOH, 0.01N NaOH 0.34N FeSO4 (NH4)2 SO4 in 2N H2SO4, Fehlings A and B (stored separately in the light) and the Soxhlet solutions. Deterioration of 0.3% H2O2 was found after storage for 90 days; however, this decrease would not affect the quantitative recovery of SO2 in a wine of 150 mg/L total SO2 if the aspiration method of analysis was used.
- Received July 1981.
- Revision received December 1981.
- Accepted January 1982.
- Published online January 1982
- Copyright 1982 by the American Society for Enology and Viticulture
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