Influence of pH and TOC concentration on Cu, Zn, Cd, and Al speciation in rivers
| Autor: | Pål Gundersen, Eiliv Steinnes |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Environmental Engineering
Alkalinity law.invention Metal Colloid Adsorption law Colloids Particle Size Waste Management and Disposal Water Science and Technology Civil and Structural Engineering Total organic carbon Chemistry Ecological Modeling Water Hydrogen-Ion Concentration Pollution Carbon Zinc visual_art Environmental chemistry Particle-size distribution visual_art.visual_art_medium Particle size Atomic absorption spectroscopy Copper Aluminum Cadmium Environmental Monitoring |
| Zdroj: | Water research. 37(2) |
| ISSN: | 0043-1354 |
| Popis: | Dissolved ( < approximately 4 nm, dialysis in situ), colloidal ( < 0.45 microm filtered, minus dissolved) and particulate (total, minus < 0.45 microm filtered) concentrations of Cu, Zn, Cd, (Al) in eight (three) mining polluted rivers were determined by atomic absorption spectrometry (flame and graphite furnace). The metal size distribution in the rivers was compared to pH, Ca concentration, alkalinity, conductivity, and total organic carbon (TOC). Data plots based on the present and other studies also yielded information about the interrelations between TOC, pH and metal adsorption in rivers and lakes. Less than 10% of Cu, Zn, and Cd were sorbed on particles or colloids in two rivers with average pH at 3.1 and 5.1, whereas 46%, 21%, and 21% of Cu, Zn, and Cd, respectively, occurred in sorbed form in six pH neutral rivers. In three pH neutral rivers, on average 55% of Al was in colloidal form, whereas the dissolved and particulate fractions were 21% and 23%, respectively. Our data combined with data from similar studies support conclusions from other research suggesting that the percent fraction of metals adsorbed on particles rises steeply from almost zero to nearly 100% within a narrow and element specific pH range. Changes in TOC concentration seem capable of shifting the pH to % metal absorption curves in the order of one pH unit. |
| Databáze: | OpenAIRE |
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