Abstract:
:The temporal dynamics of some trace elements in two different types of Mediterranean soils were studied in order to evaluate the possible long-term contamination following compost amendments. Total and available (DTPA-extractable) concentrations of Cd, Cu, Pb and Zn were determined. The study was carried out on two agricultural soils in Campania region (southern Italy), a Sandy Loam Calcaric Cambisol (SG) and a Clay Gleyc Luvisol (CO), during 3 years of organic amendment with compost. The compost, produced from the organic fraction of municipal solid waste and urban yard trimmings, in accordance with the Italian law for agricultural use, was applied at annually rates of 15, 30, and 45 t ha(-1) (on dry weight basis). Wide variations in total and available Cd, Cu, Pb and Zn concentrations were observed over time, but appeared to be in many cases unrelated to the treatments, occurring also in control plots. After 3 years of compost application the amended SG soil showed the highest and significant increase in total Cd and Zn concentrations; in addition, the available Cd, Pb and Zn concentrations increased in accordance with the compost rates. The CO soil, characterized by a higher clay content, lower organic matter content and lower cation exchange capacity, exhibited a lower increase in available metal fractions. Our findings show that compost amendment affects more the available than the total metal concentrations in the two types of soils studied and thus it is important into legislation that metal "bioavailability" may be considered in defining threshold metal values.
journal_name
Chemospherejournal_title
Chemosphereauthors
Baldantoni D,Leone A,Iovieno P,Morra L,Zaccardelli M,Alfani Adoi
10.1016/j.chemosphere.2010.05.033subject
Has Abstractpub_date
2010-08-01 00:00:00pages
1006-13issue
9eissn
0045-6535issn
1879-1298pii
S0045-6535(10)00609-0journal_volume
80pub_type
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