Heterogeneity as a concept in the interpretation of metal ion binding by humic substances. The binding of zinc by an aquatic fulvic acid
✍ Scribed by James H. Ephraim
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 625 KB
- Volume
- 267
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
✦ Synopsis
Zmc bmdmg by a well characterized fulvlc acid was studled by the ion-exchange dlstrlbutlon technique and ultrafdtratlon method at 0 100 M NaCIO, using trace amounts of zmc (a lo-' M) and two different fulvlc acid concentrations (6 2 X 10m4 and 1 2 x 10m3 M) The results were Interpreted by consldermg the various acidic sites envisaged from potentlometnc tltratlons m aqueous and non-aqueous media In addition to calculatrng the overall complex formatlon function, hterature-based constants for the complexatlon between the metal Ion and the ascrlbed functional group were employed to account for the observed bmdmg patterns as a function of pH This supported the interpretation of the functional groups assigned to the envrsaged acldlc sites Results from the ultrafdtratlon method were in agreement wth those obtained from the Ion-exchange dlstrlbutlon techmque