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Abstract

Determinations of soluble silica and chlorosity of water samples collected in and around the east Mississippi Delta showed that most of the soluble silica was removed from the river water by some process other than dilution with sea-water. While biological uptake by diatoms can account for part of this removal, it is more likely that a major portion is removed by inorganic precipitation.

Laboratory experiments with river-water and sea-water showed that both suspended matter from the river water and electrolytes in the sea-water are necessary for maximum inorganic precipitation. It is concluded that this process is an adsorption of soluble silica on suspended matter as it comes in contact with electrolytes, rather than a simple formation of salts with electrolytes. The inorganic removal can increase the weight of sediment in the water which may be expected to reach the bottom by a maximum of 4.5 percent.

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