GB/T 19941.2-2019 Translated English of Chinese Standard. (GBT 19941.2-2019, GB/T19941.2-2019, GBT19941.2-2019): Leather and fur - Determination of formaldehyde content - Part 2: Colorimetric method [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]This Part of GB/T 19941 specifies the method for determination of free and hydrolyzed formaldehyde content in leather and fur by colorimetric method. This Part is applicable to determination of formaldehyde content in various leathers, furs and their products. |
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1000mL of water 100mL of distilled 20mm cuvette 25mL Erlenmeyer flask 5mL of acetylacetone 5mL of ammonium 5mL of extraction 5mL of filtrate absorbance value measured accordance with QB/T acetate solution 4.4 acetylacetone solution 4.3 Add 5mL added formaldehyde standard adopted the international ammonium acetate solution Annex blank solution chapter numbers Chinese standards Colorimetric method Compared with ISO conical flask deleted Determination of formaldehyde determine the absorbance dissolved in 1000mL distilled water Edition Erlenmeyer flask 5.2 extraction solution 4.2 filtrate 6.2 formaldehyde content formaldehyde standard solution formaldehyde standard stock glacial acetic acid international standard iodine Leather and fur mass concentration mixture of 5mL modified and adopted Nessler's reagent Oscillate 30±1 pipette 5mL preparation of formaldehyde sample solution added Sodium hydroxide sodium lauryl sulfate Sodium thiosulfate spectrophotometer standard stock solution standard to replace Sulfuric acid Table B.1 Take a mixture technical differences temperature and avoid Test report test result water to dilute