| http://www.w3.org/ns/prov#value | - The solution is mixed with 500 ml of a solution which contains a preservative, for example phenol, cresol or methyl p-hydroxybenzoate, an agent for rendering the solution isotonic, for example sodium chloride, glycerol, glucose, or a similar carbohydrate, and a salt for buffering the pH value, for example sodium phosphate, acetate, citrate, sodium veronal, or tris(hydroxymethyl)-aminomethane.
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