1. ADAS (1986) The analysis of agricultural materials. Reference Book 427, 2nd edn. HMSO, London
2. DOE (1986) Methods for the determination of metals in soils, sediments and sewage sludge and plants by hydrochloric-nitric acid digestion, with a note on the determination of insoloble metal contents. MEWAM, HMSO, London.
3. ICRCL (1987) Guidance on the assessment and redevelopment of contaminated land. ICRCL guidance note 59/83 2nd edn. DOE, London.