| 摘要 |
PURPOSE:To detect formaldehyde in clothing by bringing a wetted paper disk into tight contact with the part to be inspected of the clothing and holding the same for the specified time, then injecting reagents successively thereto and deciding the color forming condition thereof. CONSTITUTION:The paper disk is wetted with distilled water and is brought into tight contact with the part to desire to be inspected of the clothing. The clothing and the paper disk are sandwiched by plates having no water permeability and are held for the specified time at an ordinary temp. The free formaldehyde in the clothing is migrated to the paper disk during this time. The paper disk is taken out and an aq. soln. of 5N-NaOH is injected as an alkali reagent thereto and the same amt. of a color forming reagent is injected thereto simultaneously thereafter. The disk is held still in the capped state. An aq. 0.2N-NaOH soln. of potassium periodate (KIO4) is thereafter injected as an oxidizing reagent in the same amt. thereto. The paper disk subjected to the color forming treatment in such a manner is more strongly colored as the eluted amt. of the formaldehyde is larger.
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