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Related to exch: foreign exchange, exchanges


1. exchange.
2. exchequer.
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Cobalt in the extracts of EXCH and MnOX fractions, in EDTA extracts, and in total and RES fraction digests was determined directly using graphite furnace atomic absorption spectrophotometry (GFAAS).
Concentrations ([micro]g/g) of soil Co and Mn in individual fractions Values are means of duplicate analyses Soil EXCH ORG MnOX FeAM Co Mn Co Mn Co Mn Co Mn Turira 0.
The smallest concentrations of Co were found in the EXCH fraction, whilst the largest concentrations of Co in most soils were associated with the RES, FeAM and FeCR fractions.