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SOWACS From: Lorena or Dan Moore (DJMOOR1) To: owner-sowacs@aqua.ccwr.ac.za Date: Thursday, October 31, 1996 2:53 pm Lately we've been having a series of questions about probe to soil contact and have the problems of cracking, separation, and resulting poor contact. Has anyone done any work with open cell foam rubber material as a bridge material between the probe and soil? It seems that if the foam had a sufficiently fine structure that it could provide elastistity to the probe-soil interface that would allow for good connection under a range of conditions. For TDR probes the foam may present insurmountable electrical problems but it may be quaite useful in gypsum block and tensiometer applications. Anyone have any thoughts on this? Daniel Moore On Wed, 30 Oct 1996 18:39:44 -0600 John Samuelson said: >I am looking for some information on how to prevent porous cup samplers from >freezing over the winter months. The porous cups are installed to a depth >of 1 meter and the frost line is at 1.2 meters. > >The catch is I am using bromide as a tracer so I need a technique that will >not interfere with analyzing for the bromide in my solution. I will not be >sampling over the winter months. > >Any ideas will help? > >I am not yet a member, so please respond to my personal email address: >jrsamuel@students.wisc.edu > >Sincerely, > >John Samuelson >University of Wisconsin-Madison >Soil Science Department >Work: (608) 262-0415 >jrsamuel@students.wisc.edu >