Chemistry of Cr in Some Swedish Soils

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Abstract
Cr was speciated in KH2PO4 and NH4Cl extracts of four mineral soils, aiming at testing suitability of the extractants. Total soluble Cr was analysed after conversion of the Cr to Cr(III) or Cr(VI). Cr(III) was measured on an atomic absorption spectrometer with a graphite furnace and D2-background compensation and Cr(VI) on a photometer. The APDC/MIBK procedure for Cr speciation was not sensitive to soluble total Cr or Cr(III), and the NPHA/CHCI3 procedure was not sensitive when Cr(VI) concentration was ≥5 μg (100 g)-1 soil. With exception of soluble Cr(VI) in the acid soil, interactions between methods-soils were significant. The concentration of total Cr-KH2PO4 in soils was significantly higher than the corresponding concentration of total Cr—NH4Cl. In both cases, total soluble Cr was predominantly in the cationic form Cr(III). The concentration of the anionic Cr(VI) in both KH2PO4 - and NH4Cl-soil extracts tended to increase with increasing soil pH.

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