|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 4 van 7 gevonden artikelen
| Titel: |
Effects of Total Dissolved Solids on Aquatic Organisms: A Review of Literature and Recommendation for Salmonid Species |
| Auteur: |
Phyllis K. Weber-Scannell Lawrence K. Duffy |
| Verschenen in: |
American journal of environmental sciences |
| Paginering: | Jaargang 3 (2007) nr. 1 pagina's 1-6 |
| Jaar: |
2007 |
| Inhoud: |
Total dissolves solids (TDS) are naturally present in water or are the result of mining orsome industrial treatment of water. TDS contain minerals and organic molecules that provide benefitssuch as nutrients or contaminants such as toxic metals and organic pollutants. Current regulationsrequire the periodic monitoring of TDS, which is a measurement of inorganic salts, organic matter andother dissolved materials in water. Measurements of TDS do not differentiate among ions. The amountof TDS in a water sample is measured by filtering the sample through a 2.0 µm pore size filter,evaporating the remaining filtrate and then drying what is left to a constant weight at 180ºC. Theconcentration and composition of TDS in natural waters is determined by the geology of the drainage,atmospheric precipitation and the water balance (evaporation-precipitation). The mean salinity of theworld’s rivers is approximately 120 mg L¯ 1 and the major anion found in natural waters is bicarbonate.The most commonly occurring cation in fresh water is calcium. Changes in TDS concentrations innatural waters often result from industrial effluent, changes to the water balance (by limiting inflow, byincreased water use or increased precipitation), or by salt-water intrusion. It is recommended thatdifferent limits for individual ions, rather than TDS, be used for salmonid species. These limits shouldbe based on the effect of the ion on fertilization and egg development. |
| Uitgever: |
Science Publications (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 7 gevonden artikelen
| << vorige | volgende >> |