1. Assessment of heavy metal enrichment factors and the degree of contamination in marine sediments from Tamaki Estuary, Auckland, New Zealand;Abrahim;Environ. Monit. Assess.,2008
2. Anonymous, 2001. Characterization of sludges - Determination of trace elements and phosphorus - Aqua regia extraction methods; German version EN 13346:2000. DIN EN 13346, April 2001. Charakterisierung von Schlämmen - Bestimmung von Spurenelementen und Phosphor - Extraktionsverfahren mit Königswasser; Deutsche Fassung EN 13346: 2000, Beuth Verlag (Ed.).
3. Standard Methods for the Examination of Water and Wastewater;APHA (American Public Health Association),2005
4. Heavy metal levels in surface waters from a tropical river basin, Pernambuco State, northeastern Brazil;Aprile;Acta Scientiarum. Biol. Sci.,2010
5. Chromium, nickel and cobalt in environmental samples and existing legal norms;Baralkiewicz;Pol. J. Environ. Stud.,1999