IMPREGNATION OF GLASS SURFACE AGAINST SORPTION OF PHOSPIIATE TRACES

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Abstract
During work on the uptake of phosphate ions by clays and other minerals in sea water, using such low concentrations as between 30 and 2,000 mg P/m3, the phosphate adsorption on a variety of plastics and glass had to be examined. It was found that at the pH‐range between 7.5 and 8 a considerable uptake of phosphate ions takes place.Phosphate adsorption on polyethylene and polyvinyl chloride was found to be about 3 times as high as the adsorption on glass under comparable experimental conditions. Even Teflon resin adsorbed phosphate ions, but apparently at a slower rate than glass and the plastics examined.The impregnation of glass with Desicote was inefficient, but treatment of our glass equipment with 0.5 to 1% hydrofluoric acid either in 2 n hydrochloric acid or in distilled water finally prevented the uptake of any considerable amounts of phosphate. Prevention of adsorption of other anions by this treatment is likely.

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