formaldehyde - Sciencemadness Dot Org

274
FORMALDEHYDE
hyde liberated by the acid treatment be distilled into an excess of sodium
bisulfite. This excess is titrated with iodine, after whieh alkali is added to
destroy the formaldehyde-bisulfite compound. Titration of the liberated
bisulfite completes the procedure. It should be noted, however, thatvegetable
tannine interfere with the determination 24 .
A similar method is used by Xitschmann and Hadorn 33 for the determination
of formaldehyde in formaldehyde-hardened casein. Here, the
formaldehyde is distilled into 1 per cent sodium bisulfite solution and, after
standing one hour, the excess bisulfite is titrated with deciuormal iodine
against starch. Treatment of the titrated liquor rath 95 per cent ethyl
alcohol, then with 5 per cent sodium carbonate, and retitration complete the
analysis.
According to Bougault and Leboucq 8 , combined formaldehyde in
methylolanudes can sometimes be determined by the mercurimetric method.
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