Abstract
Aqueous solutions of SA are prepared from a film of it obtained from an algal extract. The algai extract is prepared from seaweed of the species Lc~inaria saccharina and digitata. For the quenching solution 1--3% of the dried seaweeds is infused for 3--5 days in a 1% aqueous sodium carbonate solution. To obtain the SA film sulfuric or hydrochloric acid is added to the solution of the algal extract until it is neutral; at this point alginic acid separates out from the solution in the form of a gel. The alginic acid gel is dissolved in an alkaline solution of sodium carbonate or KOH, poured out onto iron pans, and dried. The film obtained dissolves readily in water.
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