Features International Sugar Journal
The Blackboard

Laboratory chemicals  [Full subscriber]

Horne’s dry lead, consisting of a mixture of 4 parts Pb(C2H3O2)2.PbO and 3 parts Pb(C2H3O2)2.2PbO, was known in 1904. In 1942 Bates noted that basic lead acetate was the most extensively used clarifying agent (dry powder or aqueous solution) for polarimetry in the sugar industry.  Bates added that it worked well as a clarifying agent, but “… requires the exercise of great caution in its use”. Lead acetate precipitates the suspended albuminoids (simple proteins, e.g. keratin, gelatine, collagen, insoluble in water.1) along with other inorganic compounds in cane juices. A correction may be needed for the volume of the precipitate. In 1909…

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