As(V)/Cr(VI) retention on un-amended and waste-amended soil samples: competitive experiments.
Focusing on simultaneous arsenic and chromium pollution, we used batch-type experiments to study As(V)/Cr (VI) competitive sorption on soil samples, pyritic material, mussel shell, oak ash, pine bark and hemp waste, as well as on binary mixtures (50 % mussel shell and 50 % another material-oak ash, pine bark, or hemp waste), and on forest and vineyard soil samples and pyritic material amended with 48 t ha-1of mussel shell, oak ash, pine bark, or hemp waste. Equal As(V) and Cr(VI) concentrations (0 to 6 mmol L-1) were added to the individual materials, binary mixtures, and 48 t ha-1amended materials. The individual forest soil sample, pyritic material, and oak ash showed clearly higher As(V) sorption, whereas Cr(VI) sorption was higher on pine bark. Sorption was up to 50 % higher for As(V) than for Cr(VI) on the forest soil sample, oak ash, and pyritic material, while pine bark sorbed 95 % more Cr(VI). Regarding binary mixtures, the presence of mussel shell increased As(V) sorption on pine bark and Cr(VI) sorption on hemp waste. As regards the amendments, in the case of the forest soil sample, the amendments with oak ash and mussel shell increased As(V) sorption, while pine bark amendment increased Cr(VI) sorption; in the vineyard soil sample, the mussel shell amendment increased As(V) sorption; in the pyritic material, pine bark amendment increased Cr(VI) sorption. These results could be useful to appropriately manage the soils and individual or mixed by-products assayed when As(V) and Cr(VI) pollution occurs.
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002, Lugo, Spain.
Ivana M
IM
Rivas-Pérez
Department of Plant Biology and Soil Science, Faculty of Sciences, Campus Ourense, University of Vigo, 32004, Ourense, Spain.
Manuel
M
Conde-Cid
Department of Plant Biology and Soil Science, Faculty of Sciences, Campus Ourense, University of Vigo, 32004, Ourense, Spain.
Juan Carlos
JC
Nóvoa-Muñoz
Department of Plant Biology and Soil Science, Faculty of Sciences, Campus Ourense, University of Vigo, 32004, Ourense, Spain.
Manuel
M
Arias-Estévez
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002, Lugo, Spain.
María J
MJ
Fernández-Sanjurjo
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002, Lugo, Spain.
Esperanza
E
Álvarez-Rodríguez
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002, Lugo, Spain. avelino.nunez@usc.es.
Avelino
http://orcid.org/0000-0001-5373-1606
A
Núñez-Delgado
D000327:Adsorption; D060105:Animal Shells / Q000737:chemistry; D000818:Animals; D001149:Arsenates / Q000032:analysis*; D049872:Bivalvia / Q000737:chemistry; D002857:Chromium / Q000032:analysis*; D065928:Forests; D024301:Plant Bark / Q000737:chemistry; D012987:Soil / Q000737:chemistry* / Q000592:standards; D012989:Soil Pollutants / Q000032:analysis*; D062611:Solid Waste / Q000032:analysis*; D014197:Trees / Q000737:chemistry
D001149:Arsenates; D012987:Soil; D012989:Soil Pollutants; D062611:Solid Waste; D002857:Chromium; C074702:chromium hexavalent ion
Arsenic; Chromium; Competitive sorption; Hemp waste; Mussel shell; Oak ash; Pine bark