Decagon Devices AquaLab 4TE Operator's Manual page 124

AquaLab
Appendix C
tion in the drawer for testing. It should read the value ±0.003 listed
in the table above. If the readings are within the expected values your
verifi cation is complete.
2. If the fi rst solution does not read within ±0.003 of the expected
value, then you need to adjust the linear off set so that the solution
reads correctly (see Chapter 7). When you are fi nished measuring
both standards, the readings should be within ±0.003 of the pre-
dicted values.
References
AOAC, Method 978.18D Preparation of Reference Salt Slushes.
1995. Offi cial Methods of Analysis of AOAC International. 16th
Ed. AOAC International, Arlington VA.
Campbell, G.S. and W.H. Gardner. 1971. Psychrometric measure-
ment of soil water potential: temperature and bulk density eff ects.
Soil Sci. Soc. Am. Proc. 35:8-12.
Greenspan, L. 1977. Humidity fi xed points of binary saturated
aqueous solutions. J. Res. National Bureau of Stds. A. Physics and
Chem. 81A:89-96.
Lang, A.R.G. 1967. Osmotic coeffi cients and water potentials of
sodium chloride solutions from 0 to 40 C. Aust. J. Chem. 20:2017-
2023.
Robinson, R.A. and R.H. Stokes. 1965. Electrolyte Solutions.
Butterworths, London.
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