Samples of deep sea-water were obtained at 25, 250 and 2000 m from the Sargasso Sea. The chlorine demands in these samples at any given contact time decrease with the depth at which the sample was obtained. The dissipation of chlorine occurs in two phases. The consumption rate of chlorine is similar in all three samples during the second phase at about 1 × 10−4 mg l−1 min−1. The difference in chlorine demand is caused primarily by the decrease in the organic chlorine demand, which occurs during the first phase of reactions, with depth reflecting the decreasing amount and increasing inertness of dissolved organic matter. The organic chlorine demands at 25, 250 and 2000 m are 0.9, 0.5 and 0.4 mg l−1 respectively. These organic chlorine demands are significantly lower than those observed in coastal sea-waters with similar dose of added chlorine of about 5 mg l−1. If sea-waters from various depths are available, deeper sea-water would be preferred as a coolant because of its smaller chlorine demand and lower initial temperature.<\/p>\n","protected":false},"excerpt":{"rendered":"
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