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Prediction and Measurement of the Water Activity of Selected Saturated Salt Solutions at 5°C and 10°C
Author(s) -
POLLIO MARÍA L.,
KITIC DORA,
FAVETTO GUILLERMO J.,
CHIRIFE JORGE
Publication year - 1987
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1987.tb14295.x
Subject(s) - electrolyte , aqueous solution , salt (chemistry) , chemistry , water activity , thermodynamics , range (aeronautics) , analytical chemistry (journal) , inorganic chemistry , chromatography , materials science , water content , geology , physics , geotechnical engineering , electrode , composite material
ABSTRACT A theoretical approach, based on the thermodynamic properties of strong electrolyte aqueous solutions, was used to calculate the a w at 5°C and 10°C of selected saturated salt solutions frequently used as standards in the range of microbial growth. The results agreed very well with experimental measurements at both temperatures for most salts studied, which included NaBr, NaCl, SrC1 2 , (NH 4 ) 2 SO 4 , KCl, BaCl 2 , and K 2 SO 4 . For KNO 3 the agreement was somewhat less satisfactory and the reasons are discussed.