1. Zief M, Mitchell JW (1976) Contamination control in trace element analysis. Wiley, New York
2. Batley GE (1989) Collection, preparation, and storage of samples for speciation analysis. In: Batley GE (ed) Trace element speciation: analytical methods and problems. CRC Press , Boca Raton, pp 1?24
3. Kosta L (1982) Talanta 29:985?992
4. ISO, Quality of water (1995) Sampling: principles, rules at preservation storage of samples. EN ISO 5667?3
5. Batley GE, Gardner D (1977) Water Res 11:745?756