1. Achterberg, E. P., Van Den Berg, C. M. G., Boussemart, M. and Davidson, W.: 1997, ‘Speciation and cycling of trace metals in Esthwaite water: A productive English lake with seasonal deep-water anoxia’, Geochim. Cosmochim. Acta 61, 5233–5253.
2. Alfaro-De la Torre, M. C., Beaulieu, P. and Tessier, A.: 2000, ‘In situ measurement of trace metals in lakewater using the dialysis and DGT technique’, Anal. Chim. Acta 418, 53–68.
3. Baes, C. F. Jr. and Mesmer, R. E.: 1977, The Hydrolysis of Cations, John Wiley, New York.
4. Ball, J. W. and Nordstrom, D. K.: 2001, User’s Manual for WATEQ4F, with Revised Thermodynamics Data Base and Test Cases for Calculating Speciation of Major, Trace, and Redox Elements in Natural Waters, U.S. Geological Survey Open File Report 91–183, Menlo Park, California, 59 pp.
5. Barakat, S.: 2004, ‘Chromium distribution and speciation in river systems affected by tannery effluents in Veneto, Italy’, Ph.D. Thesis, University of the West of England, Bristol, 325 pp.