GB 31604.32-2016 Translated English of Chinese Standard. GB31604.32-2016: National Food Safety Standard - Food contact materials and products - Determination of heavy metals in food simulantshttps://www.chinesestandard.net, 5 mag 2018 - 12 pagine This standard specifies the determination methods for titration and colorimetry of sulfur dioxide in food contact wood (bamboo) materials. This standard applies to the determination of sulfur dioxide in wood (bamboo) chopsticks, wood (bamboo) bowls, wood (bamboo) spoons and wood (bamboo) shovels. |
Sommario
| 3 | |
Scope | 4 |
Instrument and equipment | 5 |
Analysis results expression | 6 |
Precision | 7 |
Instrument and equipment | 9 |
Analysis results expression | 10 |
Precision | 11 |
Appendix A Preparation of sulfur dioxide standard solution | 12 |
Parole e frasi comuni
100mL of hydrochloric 10mL of hydrochloric 250mL of water 25mL volumetric flask absorber solution 10.2.1 accurate to 0.01g acetate solution 20g/L acid solution 1+1 ADD 10mL Analysis results expression Analytical balance arithmetic mean blank test calculation result Colorimetry content of sulfur Conversion factor Determination of sulfur dioxide in wood EDTA Electric planer Food contact materials formaldehyde HEAT and DISTILL Hydrochloric acid solution hydrochloride stock solution INSTALL condensing device iodine standard solution iodine standard titration iodine volumetric flask kilogram lead acetate solution lower end mass of sulfur Mercuric chloride mercuric tetrachloride absorber milligrams milliliters mL MIX it uniformly Modify method summary Modify results calculation Phosphoric acid PIPETTE planer or chainsaw PLUG the stopper Potassium chloride potassium mercuric tetrachloride protected from sulfur Reagents Sample preparation sample solution standard titration solution Starch indicator 10g/L Sulfur dioxide standard sulfur dioxide therein test from ADD tetrachloride absorber solution water to dilute wood bamboo wood materials