1. Agricultural and veterinary chemicals (control of use) (fertilisers) regulations (2015) S.R. No. 108/2015.Part 3-standard for maximum levels of contaminants in fertilisers. Available:
http://classic.austlii.edu.au/au/legist/vic/consol_reg/aavcour
2. AOAC (2005) Official method of analysis, 18th edn. V.A Association of Official Analytical Chemist, Arlibton
3. Azeem B, KuShaari K, Man ZB, Basit A, Thanh TH (2014) Review on materials and methods to produce controlled release coated urea fertilizer. J Control Release 181:11–21
4. Bartlett R, James B (1979) Behavior of chromium in soils: III. Oxidation. J Environ Qual 8:31–35
5. Bergs C-B (2014) Novelle der Klärschlammverordnung (AbfKlärV) und Übelegungen des BMUB zu einer Phosphor-Rückgewinnungsverordnung. Bundesministerium für Umwelt, Naturschutz, Bau und Reaktorsicherheit