Effect of Preservation Techniques on the Determination of Nitrite in Freshwater Samples
| Autor: | Daniel Cluis, Geneviève Bégin, Julie Corriveau, Eric van Bochove |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Environmental Engineering
Ecological Modeling Environmental engineering Contamination Pollution Dilution law.invention chemistry.chemical_compound Nitrate chemistry law Environmental chemistry Congelation Environmental Chemistry Nitrite Turbidity Water pollution Filtration Water Science and Technology |
| Zdroj: | Water, Air, and Soil Pollution. 193:335-342 |
| ISSN: | 1573-2932 0049-6979 |
| Popis: | In the view of accepted ideas about the preservation of nitrite in freshwater, this short note presents experiments questioning standard laboratories procedures and tries to be a caveat to experimenters looking for sole total nitrite values more than for total nitrate plus nitrite concentrations. To validate an adequate preservation technique for nitrite, we realized a series of three experiments investigating the effect of filtration, freezing and ageing on initial nitrite concentrations found in freshwater samples collected in an agricultural watershed. Experiment results demonstrate no adsorption or dilution of NO2 − concentrations during filtration. Nonetheless, we recommend using filtration only when sample turbidity is visible at the eye to avoid any contamination with laboratory materials during manipulations. Furthermore, results also indicate that freezing samples induces a significant decrease of NO2 − concentrations whereas the long term storage at 4°C of samples induces a smaller variability on nitrite concentrations. In consequence, we forbid the use of freezing as a preservation technique for nitrite analysis from freshwater samples and rather recommend storage of samples at 4°C for a period of 48 h. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink