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Section: 15 | Standard Salt Solutions for Humidity Calibration |
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The table 'Relative Humidity for Humidity Calibration with Standard Salt Solutions as a Function of Temperature' has one or more different columns to those in the book version.
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John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

STANDARD SALT SOLUTIONS FOR HUMIDITY CALIBRATION

Saturated aqueous solutions of inorganic salts are convenient secondary standards for calibration of instruments for measurement of relative humidity. The International Union of Pure and Applied Chemistry has recommended salt solutions for calibrations in the range of 10% to 90% relative humidity (RH), and the American Society for Testing and Materials has published similar standards. The data in this table are taken from the IUPAC recommendations, except for K2CO3 and K2SO4, which are ASTM recommendations.

Details on the preparation and use of these standards may be found in Refs. 1 and 2. Data for other salts are given in Ref. 3. Column definitions for the table are as follows.

Column heading Definition
Mol. form. Molecular formula of salt used to make saturated aqueous solutions
RH(0 °C), RH(10 °C), etc. Relative humidity, in %, of the saturated aqueous solution at the temperature indicated within the parentheses

References

  1. Marsh, K. N., Editor, Recommended Reference Materials for the Realization of Physicochemical Properties, Blackwell Scientific Publications, Oxford, 1987, pp. 157–162.
  2. Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions, ASTM Standard E 104-02, Reapproved  2020.
  3. Greenspan, L., J. Res. Nat. Bur. Stand., 81A, 89, 1977. [https://doi.org/10.6028/jres.081A.011]
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Relative Humidity for Humidity Calibration with Standard Salt Solutions as a Function of Temperature



NameMol. form.RH(0 °C)/%RH(5 °C)/%RH(10 °C)/%RH(15 °C)/%RH(20 °C)/%RH(25 °C)/%RH(30 °C)/%RH(35 °C)/%RH(40 °C)/%RH(45 °C)/%RH(50 °C)/%RH(55 °C)/%RH(60 °C)/%RH(65 °C)/%RH(70 °C)/%RH(75 °C)/%RH(80 °C)/%
Lithium chlorideLiCl11.31 ± 0.3111.30 ± 0.2711.28 ± 0.2411.25 ± 0.2211.21 ± 0.2111.16 ± 0.2111.10 ± 0.2211.03 ± 0.2310.95 ± 0.2610.86 ± 0.2910.75 ± 0.3310.64 ± 0.3810.51 ± 0.44
Magnesium chlorideMgCl233.66 ± 0.3333.60 ± 0.2833.47 ± 0.2433.30 ± 0.2133.07 ± 0.1832.78 ± 0.1632.44 ± 0.1432.05 ± 0.1331.60 ± 0.1331.10 ± 0.1330.54 ± 0.1429.93 ± 0.1629.26 ± 0.1828.54 ± 0.2127.77 ± 0.2526.94 ± 0.2926.05 ± 0.34
Potassium carbonateK2CO343.1 ± 0.743.1 ± 0.543.1 ± 0.443.2 ± 0.343.2 ± 0.343.2 ± 0.443.2 ± 0.5
Magnesium nitrateMg(NO3)260.35 ± 0.5558.86 ± 0.4357.36 ± 0.3355.87 ± 0.2754.38 ± 0.2352.89 ± 0.2251.40 ± 0.2449.91 ± 0.2948.42 ± 0.3746.93 ± 0.4745.44 ± 0.60
Sodium chlorideNaCl75.51 ± 0.3475.65 ± 0.2775.67 ± 0.2275.61 ± 0.1875.47 ± 0.1475.29 ± 0.1275.09 ± 0.1174.87 ± 0.12
Potassium chlorideKCl88.61 ± 0.5387.67 ± 0.4586.77 ± 0.3985.92 ± 0.3385.11 ± 0.2984.34 ± 0.2683.62 ± 0.2582.95 ± 0.2582.32 ± 0.2581.74 ± 0.2881.20 ± 0.3180.70 ± 0.3580.25 ± 0.4179.85 ± 0.4879.49 ± 0.5779.17 ± 0.6678.90 ± 0.77
Potassium sulfateK2SO498.8 ± 2.198.5 ± 0.998.2 ± 0.897.9 ± 0.697.6 ± 0.597.3 ± 0.597.0 ± 0.496.7 ± 0.496.4 ± 0.496.1 ± 0.495.8 ± 0.5


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