Rocky Mountain Research Station Publications
RMRS Online Publication
RMRS-RN-18: Salt content determination for bentonite mine spoil:
saturation extracts versus 1:5 extracts
Voorhees, Marguerite E.; Uresk, Daniel W. 2004. Salt content determination for bentonite mine spoil: saturation extracts versus 1:5 extracts. Res. Note RMRS-RN-18. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 7 p.
The reliability of estimating salt content in saturated extracts from 1:5 (1spoil:5water) extract levels for bentonite mine spoil was examined by regression analyses. Nine chemical variables were examined that included pH, EC, Ca++, Mg++, Na+, K+, HCO3-, SO4-, and Cl-. Ion concentrations from 1:5 extracts were estimated with high predictability for Ca++, Mg++, Na+, SO4-, HCO3-, and EC conductivity. Overall, calculated ion concentrations from 1:5 extracts show significant relationships with saturation extracts, except for Cl- and K+. The significant relationships we found suggest that 1:5 extracts can be used to reliably estimate salinity of bentonite mine spoils with less effort and expense.
Keywords: bentonite, mine spoil, salt content, salinity, saturation extracts, 1:5 extracts, ion concentrations
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Title: RMRS-RN-18:
Salt content determination for bentonite mine spoil: saturation
extracts versus 1:5 extracts
Electronic Publish Date: July 14, 2004
Last Update: July
14, 2004