Variations des teneurs en Cd,Pb et Cu dans les eaux de l'estuaire maritime du St-Laurent Durant l'ete 1972 |
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| Authors: | Michel Arnac |
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| Institution: | Université du Québec à Rimouski, SOUQAR (Section d''Oceanographie de l''Université du Québec à Rimouski), Département des Sciences Pures, Rimouski, Que. Canada |
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| Abstract: | Concentrations of cadmium, lead and copper have been determined in the lower estuary of the St. Lawrence River during the summer of 1972 (from May to August). Seven sample stations distributed in the estuary have been studied. Analysis measurements have been made using atomic absorption spectrophotometry and are related to the soluble metals. The concentrations of cadmium are low and no important variations occur. Mean analysis of cadmium abundance gives a value of 1.05 μg/l. Similar variations are observed for copper and lead contents with a Cu/Pb ratio which is nearly equal to unity. Average concentrations for all the stations are 3.11 μg/l for copper and 3.48 μg/l for lead. Higher values are measured for copper and lead during the month of May and these are related to the fresh-water inflow arising from the thawing period. The lowest concentrations are observed during the months of June and July and are in correspondence with the spring period of intense primary production. The biologic-dynamic conditions affecting the concentrations of cadmium seem to be different from those affecting copper or lead contents (without considering pollution phenomena). The highest average values for copper and lead have been found on the south shore of the estuary. The values obtained in this work compared favourably with other results gathered in the neighbouring area. |
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