[RASMB] sednterp values

[Tom Laue]

Hi-
Sednterp uses a polynomial fit of the tabulated viscosity (and density) 
data, and the error in the fit may exceed the effect on the viscosity at 
low concentrations. The maximum error in the fit is provided in the 
database. If the effect on the viscosity is less than this error, I 
would either: a) not include the MnSO4 or MgSO4 in the calculations or 
b) go to the tabulated values (older CRC handbooks, or the international 
critical tables are now available on line) and calculate the viscosity 
increment.
Best wishes,
Tom

Judith Kornblatt wrote:
> I recently tried to compute viscosity values for solutions of MnSO4 
> and MgSO4, using SEDNTERP, version 1.09. The smaller the concentration 
> of the salt, the greater the effect on the viscosity! For example, at 
> 20 C, (all values are X E-2)
>    MnSO4, 50 mM    visc = 1.0308
>                   10 mM              .988
>                      1 mM              .967
>                    0.1 mM              .9603
>
>    MgSO4, 50 mM   visc = 1.0315
>                   10 mM             1.035
>                     1 mM              1.0576
>                      0.1 mM           1.0678
>            This makes no sense to me, so I assume there is a problem 
> somewhere. Has anyone else seen this sort of behavior? Any explanation? 
> Judith Kornblatt Concordia University
> Montreal, Quebec               
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-- 
Department of Biochemistry and Molecular Biology
University of New Hampshire
Durham, NH 03824-3544
Phone: 603-862-2459
FAX:   603-862-0031
E-mail: Tom.Laue at unh.edu
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