Abstract
The soluble components transferect from urea resin tablewares used for long period, were discussed in the previous paper.In this paper, the methods of separation and determination of free formaldehyde were studied by liquid chromatography with thermal detector, for a basic study on the toxicity of formaldehyde.The thermal detector was unsatisfactory for determination of formaldehyde in low concentration, because of poor sensitivity. Therefore, the determination were made on the combined use to liquid chromatography and colorimetry with acetylacetone.The chromatographic conditions used were as follows:Apparatus JLC A Type (Nihon Denshi)Fixed phase Dowex 50W-X8Eluent 0.1N HClFlow rate of eluent 0.6ml/minColumn: for separation 0.8×50cm (room temp.)for detection 0.8×8cm (35°C)Sensitivity ±1/100°C or 3/1000°C cfsChart speed 60mm/hrMain results of experiments are summarized as follows:(1) The recovery of free formaldehyde (Cf) was 90-100% in the case of addition of formaldehyde.(2) Total formaldehyde (Ct) was determined after steam distillation and combined form formaldehyde (Cc) was calculated from the following formula.Combined HCHO(Cc)ppm=Total HCHO(Ct)-Free HCHO(Cf)(3) Free formaldehyde was determined about 1-87ppm on 12 samples of urea and melamine resin tablewares, and combined formaldehyde was about 0-31ppm.
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