It is shown that only Schiff's method is suitable for the determination of formaldehyde in methylated cellulose formals. These are intermediates in the elucidation of the struc ture of cotton cross-linked with formaldehyde. Some modifications of the usual pro cedure are recommended to obtain an accuracy of 3% relative to the amount of formaldehyde present. The modified Schiff's method was standardized with cellulose formals containing C14-formaldehyde whose activity was determined by ionization chamber assay after combustion to CO2. A routine determination of C14-formaldehyde in cellulose formals by the liquid scintillation method is also described.
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