On the Method of Microdetermination of Formaldehyde in the Smoked Foods

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To determine the quantity of formaldehyde in smoked fish by Iodometry, N/100 Iodine and Sodium Thiosulfate solutions were prepared, and the accuracy of the method was tested with diluted formaline solutions of definite concentraiton. As a result of the tests, about 5/100, 000 diluted formaldehyde could be detected. To determine the quantity of formaldehyde in smoked fish meat, distillates of ground smoked fish meat prepared by steam distillation serves for Iodometry. Each 50 c. c. of the distillate is separately obtained at every 5 minutes and must be prepared in this way up to 6th distillate. All 6 distillates are mixed togather for the next Iodometry. The maximum quantity of formaldehyde in the smoked fish meat can be obtained when the meat is ground and soaked immediately in distilled water. This microdetermination of formaldehyde in the smoked foods demands careful attention in the experiment, otherwise the exact amount can not be ascertained.
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