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Evaluation of selected cobalt-60 complexes as tracers of groundwater |
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| Authors: | Frank N Bruscato Assistant Professor and J Roger McHenry Research Chemist |
| Institution: | a Department of Chemistry, Northeast Louisiana State College, Monroe, USA b USDA, Oxford, UK |
| Abstract: | A series of Co-60 compounds, considered as potentially useful tracers of groundwater movement, were prepared and evaluated in soil column and batch studies. The compounds were: potassium hexacyanocobaltate (III), K3Co(CN)6; potassium ethylenediamminetetraacetato-cobaltate (III), KCo(EDTA); ammonium 12-tungstodicobaltoate (III), (NH4)8Co(II)Co(II)W12O42] · 20 H2O; chloraquotetrammine cobalt (III) chloride, Co(NH3)4(H2O)Cl]Cl2; and sodium hexanitrocobaltate (III), Na3Co(NO2)6. The performance of K3 60Co(CN)6 and K 60Co EDTA were dependent on their environment and more especially on the type and amount of clay present. The EDTA cobalt complex cannot be used in soils that are basic or where a large fraction of the clay is saturated with Na+ and/or Ca++. Of the other radioactive tracers tested, none were suitable for groundwater tracing because of instability in aqueous solution (Na3Co(NO2)6), variable anionic structure under acid conditions ((NH3)8Co(II)Co(II)W12O42] · 20 H2O), or preferential uptake by the clay fraction (Co(NH3)4(H2O)Cl]Cl2). |
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