TY - JOUR
T1 - Trace element associations with Fe- and Mn-oxides in soil nodules
T2 - Comparison of selective dissolution with electron probe microanalysis
AU - Neaman, Alexander
AU - Martínez, Carmen Enid
AU - Trolard, Fabienne
AU - Bourrié, Guilhem
N1 - Funding Information:
This study was funded by the USDA-NRI Competitive Grants Program (Award No. 2003-35107-13650 to C.E.M.) and by the ECOS-CONICYT scientific cooperation program between France and Chile (Project C05 B05). We thank Mark Angelone (Pennsylvania State University) for EPMA analyses and an anonymous reviewer for helpful comments.
PY - 2008/4
Y1 - 2008/4
N2 - Selective dissolution methods have been largely used to get insight on trace element association with solid phases. Modern instrumental techniques offer many tools to test the validity of selective dissolution methods and should be systematically used to this end. The association of trace elements with Fe- and Mn-oxides in soil nodules has been studied here by electron probe microanalysis. The results were compared with findings from an earlier study on selective dissolution of the same nodules by hydroxylamine hydrochloride, acidified hydrogen peroxide, and Na-citrate-bicarbonate-dithionite. Electron probe microanalysis results were consistent with previous findings using selective dissolution and showed that P, As and Cr were mainly present in Fe-oxides, while Co was mainly associated with Mn-oxide phases. These results support the applicability of the studied selective dissolution methods for fractionation of trace elements in soils and sediments containing appreciable amounts of Fe and Mn-oxide phases.
AB - Selective dissolution methods have been largely used to get insight on trace element association with solid phases. Modern instrumental techniques offer many tools to test the validity of selective dissolution methods and should be systematically used to this end. The association of trace elements with Fe- and Mn-oxides in soil nodules has been studied here by electron probe microanalysis. The results were compared with findings from an earlier study on selective dissolution of the same nodules by hydroxylamine hydrochloride, acidified hydrogen peroxide, and Na-citrate-bicarbonate-dithionite. Electron probe microanalysis results were consistent with previous findings using selective dissolution and showed that P, As and Cr were mainly present in Fe-oxides, while Co was mainly associated with Mn-oxide phases. These results support the applicability of the studied selective dissolution methods for fractionation of trace elements in soils and sediments containing appreciable amounts of Fe and Mn-oxide phases.
KW - Citrate-bicarbonate-dithionite
KW - EPMA
KW - Fractionation
KW - Hydrogen-peroxide
KW - Hydroxylamine-hydrochloride
KW - Iron-oxides
KW - Manganese-oxides
KW - Tropical-soil
UR - http://www.scopus.com/inward/record.url?scp=41149142249&partnerID=8YFLogxK
U2 - 10.1016/j.apgeochem.2007.12.025
DO - 10.1016/j.apgeochem.2007.12.025
M3 - Article
AN - SCOPUS:41149142249
VL - 23
SP - 778
EP - 782
JO - Applied Geochemistry
JF - Applied Geochemistry
SN - 0883-2927
IS - 4
ER -