Sequential extraction of selenium from four Scottish soils and a sewage sludge

Autor:	Brian A. McGaw, Charles A. Shand, F. MacLeod
Rok vydání:	1998
Předmět:	chemistry Environmental chemistry Extraction (chemistry) Soil water Soil Science Soil chemistry chemistry.chemical_element Fractionation Isotope dilution Agronomy and Crop Science Organic fertilizer Sludge Selenium
Zdroj:	Communications in Soil Science and Plant Analysis. 29:523-534
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629809369964
Popis:	A sequential extraction procedure was used to assess the availability of selenium (Se) from four Scottish soils which may receive sewage sludge and a sewage sludge that may be applied to agricultural land. The procedure identified two exchangeable (available) and three non‐exchangeable Se fractions. The exchangeable fractions were defined as soluble (0.25M KCl) and ligand exchangeable (0.1M KH2PO4). The non‐exchangeable fractions were defined as acid‐extractable (4M HCl), oxidizable (dissolution in KClO3 and concentrated HNO3), and residual (dissolution in HF and HNO3). The fraction of Se defined as acid‐extractable is not readily available for plant uptake, but has the potential to become available through chemical and microbial mobilization. The total Se was also determined for each soil and the sewage sludge by a one step digestion procedure using HNO3 and HF acids. The determination of Se in the individual fractions was performed by isotope dilution‐mass spectrometry using 76Se. The total Se ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::84340b1adb448f2484db35c62a896e56 https://doi.org/10.1080/00103629809369964 Zobrazit plný text záznamu