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Management of Commercially Generated Radioactive Waste - U.S. ...

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K.28<br />

TABLE K.3.2 Factors Reported to Effect Adsorption <strong>of</strong> Radioelements Over the pH Range<br />

<strong>of</strong> 4 to 9 (Karn-Bransle-Sakerhet 1978)<br />

Factors<br />

Complex Ions Probable<br />

Element pH Eh<br />

Soil<br />

CEC<br />

Competing<br />

Ions Selectively Adsorbed on<br />

Inorganic<br />

Ligands<br />

Organic Colloid Adsorption<br />

Constutuents Formation Mechanisms<br />

Am X X X IE<br />

Sb X Iron Oxides X X X PPT<br />

Ce X X X X TE, PPT<br />

Cs X Zeolites, Micas IE<br />

Co X Illite, Iron Oxide X X X IE, PPT<br />

Cm X X PPT<br />

Eu X X X IE, PPT<br />

I OM X OM<br />

Np X X UNK<br />

Pu X X X X X X IE, PPT<br />

Pm X X X IE, PPT<br />

Ra X X Zeolites, Barite IE<br />

Ru X OM X X PPT<br />

Sr X X X Calcite, Zeolites X X IE<br />

Tc X UNK<br />

Th X X OM X X X IE, PPT<br />

3 H H20 NONE<br />

U X X X OM X X PPT,IE<br />

Zr X X X X PPT<br />

(a) CEC = Cation Exchange Capacity.<br />

(b) IE = Ion exchange, OM = Organic Matter Adsorption, PPT = Precipitation, UNK = Unknown.<br />

TABLE K.3.3. Thermal Stabilities and Cation Exchange Capacities <strong>of</strong> Several Clay Minerals<br />

and Zeolites (Breck 1974, Eberl et al. 1978, Ames and Sand 1958, Grim 1968)<br />

Hydrated<br />

Cation Exchange . Thermally Unstable<br />

Material Composition Capacity, meq/100 g in Air at, °C<br />

Chabazite Ca 2 (A10 2 ) 4 (Si0 2) 8 * 3H 2 0 390 600<br />

Erionite Ca4. 5 [(A10 2 ) 9 (Si0 2) 7 27H 20 310 750<br />

Clinoptilolite Ca 3 (A10 2 ) 6 (Si0 2 )30 ]24H20 220 750<br />

Mordenite Ca 4 (A10 2 ) 8 (Si0 2 ) 4 01 *24H 2 0 230 800<br />

Montmorillonite (A13. 34 Mg0. 6 6 )Si 80 2 0(OH) 4*H 20 150 390<br />

Hydrothermal Stabilities at 100 Bars Pressure for 10 Days<br />

0 C Products Composition<br />

Chabazite 230 Wairakite Ca 8 (A10 2 ) 1 6 (Si0 2 ) 32 16H 20<br />

Clinoptilolite 360 Mordenite<br />

Montmorillonite 400 Quartz, Feldspar Si0 2 , NaA13Si30 8<br />

Montmorillonite 300 Quartz, Montmorillonite

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