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rising calcium and magnesium concentrations in water. In surface waters, lead largely accumulates in backside sediments at concentrations about four orders of magnitude greater than in the water.A major supply of airborne lead contamination, and therefore of surface waters, is the exhaust fumes of motor vehicles which contain the break-down product of tetraethyl lead. For fish generally, the maximum admissible concentration of mercury in organic compounds has been prompt to be as little as 0.0003 mg per litre. Acute deadly concentrations of inorganic mercury compounds are in the vary of zero.three to 1.0 mg per litre for salmonids

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