1. Aiken GR, McKnight DM, Wershaw RL, McCarthy P (1985) Humic substances in soils, sediment and water. Wiley, New York, pp 363–385
2. Buffle J, Tessier A, Haerdi W (1984) In: Kramer CJM, Duinker JC (eds) Complexation of trace metals in natural waters. Martinus Nijhoff/Dr W Junk, The Hage, pp 301–316
3. Gu B, Schmitt J, Chen Z, Liang L, McCarthy JF (1995) Geochim Cosmochim Acta 59:219–229
4. Wilkinson KJ, Balnois E, Leppard GG, Buffle J (1999) Colloids Surf A 155:287–310
5. Liu ZP (2003) Sci Total Environ 309:117–126