Volumetric Estimation of Malonates by Oxidation with Iodine

A procedure is described for volumetric determination of malonate ion, based on its reaction with known excess of standard iodine solution at 100° and titrating the residual iodine with a standard hypo solution. The procedure is applicable to neutral malonate solutions containing 15 to 80 mg. of malonic acid. with a precision of 1% or more. The interference caused by salts of organic acids and other organic substances has also been investigated.