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11-08-2010, 02:52 PM #1
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The effects of an industrial waste (cryolite recovery sludge) upon the atlantic Salmo
By A. D. F. Johnstone, D. Whitford, A. D. Hawkins
Water Research, Volume 16, Issue 11, 1982, Pages 1529-1535, ISSN 0043-1354, DOI: 10.1016/0043-1354(82)90204-4.
Thresholds for detection of cryolite recovery sludge (CRS, an aluminium smelter waste dumped at sea) were determined for salmon. Salmo salar (L.). in sea water using a cardiac conditioning technique. Some effects of exposure of salmon to CRS filtrate (mean concentration 5.5[degree sign]D) for up to 1 h were monitored. Oxygen consumption and ventilation rate increased and heart rate decreased after presentation of the filtrate. The effects were transient and the physiological parameters monitored returned to pre-exposure levels within 2 h of ceasing filtrate presentation. Detection levels for an amino acid (glycine) were determined for salmon in sea-water before and after exposure to CRS filtrate (mean concentration 5.5%). Within 24 h of exposure to the CRS filtrate the mean threshold level was significantly different from the pre-exposure detection level. However, 24-48 h after exposure the threshold for detection of glycine was no longer significantly different.