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| Titel: |
Sediment-Water Interactions in Farm Dugouts Previously Treated with Copper Sulfate |
| Auteur: |
Prepas, E. E. Murphy, T. P. |
| Verschenen in: |
Lake and reservoir management |
| Paginering: | Jaargang 4 (1988) nr. 1 pagina's 161-168 |
| Jaar: |
1988-07-01 |
| Inhoud: |
In 1987 10 drinking water dugouts or manmade ponds in northwestern Alberta were studied to evaluate how much copper (Cu) had accumulated in the bottom sediments and whether this sediment copper recycled back into the overlying water. Six dugouts had been treated with varying dosages of copper sulfate (up to 950 μg/L Cu/yr) annually until 1986, and four dugouts had not been treated recently with copper sulfate. None were treated with copper sulfate in 1987. Copper concentrations in the sediments of all 10 dugouts reflected the treatments given: copper levels in the surface sediments of the treated dugouts reached 2 mg/g copper (dry weight), but were less than 40 μg/g copper in the untreated dugouts. Total dissolved copper concentrations in the limnetic zone of the six dugouts treated previously with copper sulfate fluctuated (up to 99 μg/L copper) during the summer; whereas they remained low in the untreated dugouts (< 10 μg/L copper). Large increases in limnetic copper concentrations were associated with periods when water overlying the bottom sediments was low in dissolved oxygen (<2mg/L). In contrast to observations in some other systems, evidence is provided that copper accumulated in bottom sediments can recycle into the open water throughout the summer. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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