In experiments with one freshwater (Chlorella pyrenoidosa) and three marine organisms (Phaeodactylum tricornutum, Cyclotella mna, and Chaetoceros galvestmensis), mercury was more toxic than the other metals tested (silver, cadmium, lead, and copper) ; and its toxicity is comparatively irreversible.
Effect of toxicants on algal sinking rates
โ Scribed by C. M. Pekkala; B. Koopman
- Book ID
- 104778752
- Publisher
- Springer Netherlands
- Year
- 1987
- Tongue
- English
- Weight
- 377 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0049-6979
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โฆ Synopsis
A fluorometric technique was used to measure sinking rates of Scenedesmus acuminatus following exposure to C1 and Cu. Observed rates became larger in proportion to chemical dosage. The maximum values were 6.4 x ambient at 7.5 g m-3 chlorine and 7.0 ร ambient at 40 g m-3 Cu. In comparison, a maximum increase in sinking rate of 5.4 x ambient was achieved with 49 g m-3 alum. Microscopic observations indicated that cell lysis and flocculation resulted from exposure of algal cells to toxicants.
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Ankistrodesmus braunii was used as the test organism to assess the effects of mercuric chloride on the growth of this species. Optical density measurements correlated highly with dry weight determinations, chlorophyll content, total cell counts, and respiring cell counts. Any one of the above method