Strontium Sorption onto SRP Soils Page: 2 of 28
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TECHNICAL DIVISION CC: W. R. Stevens, 773-A
SAVANNAH RIVER LABORATORY E. L. Albenesius, 773-1A
J. A. Stone, 773-A
H. P. Olson, 773-A
C. M. King, 773-42A
LLW Group (14)
SRL Record Copy (4)
A#d' A/9, /9l'38
June 13, 1984
TO: G. T. WRIGHT
S R L FD LE " a
FROM: S. L. HOEFFNER (2)
2k/V // R CORD COPY
STRONTIUM SORPTION ONTO SRP SOILS
The effect of water and soil quality variables on the sorption
of strontium onto SRP soils was evaluated. The variables cover the
range of conditions observed in the low-level waste burial ground.
The sorption coefficient of strontium is a direct function of clay
content. Trench water concentrations of the divalent cations
Mg2+, and Ca2+ as well as the monovalent K+ decrease the
strontium Kd by a factor of three. The ions Na+, Cl and NO3- have
no effect. The pH of the water in contact with the soil is a major
factor influencing Kd. In fact, the decrease in Kd caused by
the cations Mg2+, Ca2+, and K+, and the decrease caused by lower
flay nntsnt of the snil can be explained completely by the
observed pH changes.
The low Eh and high dissolved iron found in some trench waters
was simulated by adding Fe2+ to the groundwater/soil system. A
drastic drop in pH and Sr Ed occurred. Adjustment of the pH to
the near neutral pH's of 6 to 7 observed for most trenchwaters
resulted in a strontium Ed (approximately 1200 mL/g) lower than
the pH 6.5 groundwater/soil Rd (approximately 2200 mL/g) but much
higher than the actual trnnh water Ka's (7 to 300 mL/a). The
limited strontium sorption may be a result of organics, iron, or
the high ionic strength present in some of the trench waters. How
organics might decrease strontium sorption is unknown at this
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Hoeffner, S.L. Strontium Sorption onto SRP Soils, report, July 2, 2001; South Carolina. (digital.library.unt.edu/ark:/67531/metadc724140/m1/2/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.