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New article on Mobility and fractionation of arsenic PDF Print E-mail

Researchers in LTU, MCN project C, received acceptance for their article on Mobility and fractionation of arsenic, chromium and copper in thermally treated soil.


Thermal treatment is used to remediate soil co-contaminated with organic and inorganic contaminants. It destroys organic

contaminants, but the remaining inorganic contaminants require further treatment. In this study the effects of thermal

treatment on the mobility, speciation and chemical fractionation of As, Cr and Cu in a CCA-polluted soil were evaluated

by leaching tests, As speciation assays and a sequential extraction procedure. The soil was sieved into four size fractions

(<0.125, 0.125–0.250, 0.250–0.500 and 0.500–1.0 mm), each of which was treated at 800C and analysed in comparison with

the untreated soil. The leaching of As and Cr increased by factors of 18–40 and 2–23, respectively, while the mobility of Cu

decreased 12–14-fold after treatment. The concentration of As(V) in pore water of the finest soil fraction increased 19-fold,

whereas that of As(III) remained constant. The treatment reduced As, Cr and Cu associated with the reducible soil fraction.

In addition, it increased the proportions of As and Cr (slightly) associated with the exchangeable and acid-soluble soil

fractions, and the proportions of Cu and Cr (substantially) associated with the residual fraction. Reference: 

Waste Management & Research 29(1) 3–12. Authors:  De´sire´e Nordmark, Jurate Kumpiene, Lale Andreas and

Anders Lagerkvist