Physiologically based extraction of heavy metals in compost: preliminary results.
A physiologically based extraction test (PBET) was run for the extraction of six metals (Cu, Zn, Cd, Cr, Ni and Pb) in four composts containing high concentrations of heavy metals. An aqueous solution of pepsin plus citric, acetic, and malic acids buffered to pH 2 was used to simulate the gastric mixture, and an extraction of 1h at 37 degrees C was run with a solid:liquid ratio of 1:100. The results were compared to those obtained using water and CaCl(2)-DTPA solution. The PBET extracted far more metals than water, but less than CaCl(2)-DTPA for Cu, Pb and Cr, while giving similar or slightly lower results for Cd, Zn, and Ni.
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Campus Sur s/n, 15782 Santiago de Compostela, Spain.
Remigio
R
Paradelo Núñez
Rosa
R
Devesa Rey
Ana
A
Belén Moldes Menduíña
María
M
Teresa Barral Silva
D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry
D019216:Metals, Heavy