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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Dear Saskatoon, The paper published by A.R.G. Lang, 1967 (Osmotic coefficients and water potentials of sodium chloride solutions from 0 to 40 oC, Aust. J. Chem., 20:2017-2023) have been used as a standard to calibrate different soil water potential instruments (such as soil and plant hygrometers/psychrometers, filter paper technique, etc.). In the paper you'll find the water potential (-214.4 to -10350 J kg -1) vs. molality of NaCl solution at different temperatures (0 to 40 oC). Hope it helps. S. Irmak At 09:59 AM 1/25/01 +0000, you wrote: Bruce: > >I am going to be calibrating some of the Campbell Scientific 229 sensors. > I am going to use pressure from 0-400 kPa but I would like to calibrate >at a higher kPa. I read somewhere that letting the sensors "hang" in a >jar containing a solution of potassium sulfate at 20 degrees Celcius will >give an equivalent total suction of 4120 kPa. Do you know of a solution >(and temperature) that might give an equivalent total suction between 400 >and 4120 kPa? I would really appreciate the input. > ></smaller></fontfamily> > ><fontfamily><param>Times New Roman</param><smaller>Elizabeth A. Garven > ></smaller></fontfamily> > ><fontfamily><param>Times New Roman</param><smaller>125B-105th Street >East > >Saskatoon, Saskatchewan > >CANADA > >Phone: (306) 955-3218 > ><<mailto:eag-okc@attcanada.ca>eag-okc@attcanada.ca > ></smaller></fontfamily> Suat Irmak Agric. & Bio. Eng. Dept. University of Florida, Rogers Hall P.O. Box 110570, Gainesville, FL 32611-0570 E-mail: aysu@grove.ufl.edu WWW: http://www.agen.ufl.edu/~isuat