论文部分内容阅读
甲醛是非食品防腐剂,不允许在食品中使用。为了打击不法商贩在销售的水发产品中加入甲醛来延长产品保存期的违法行为.掌握产品中甲醛的含量,我们利用酚试剂比色法的原理对水发产品中的甲醛含量进行了测定,为监督员的调查取证提供了准确可靠的数据。1原理甲醛被酚试剂溶液吸收,反应生成嗪,嗪在酸性溶液中被高铁离子氧化形成蓝绿色化合物,比色定量。2试剂和仪器2.1酚试剂溶液称量0.1g酚试剂加水溶解,倾于100ml具塞量筒中,加水至刻度放冰箱保存,可稳定3d。2.2酚试剂使用液吸取5ml酚试剂溶液,加95ml水,混匀。临用现配。
Formaldehyde is a non-food preservative that is not permitted in food. In order to combat unscrupulous traders in the sale of water products added formaldehyde to extend the shelf life of the product illegal.In order to grasp the content of formaldehyde in the product, we use the principle of phenol reagent colorimetry to determine the content of formaldehyde in water products, Provided accurate and reliable data for the supervisor’s investigation and evidence collection. Principle 1 Formaldehyde is absorbed by the phenol reagent solution, the reaction generates oxazine, oxazine in acidic solution is oxidized by high-iron ions to form a blue-green compound, colorimetric. 2 reagents and equipment 2.1 phenol reagent solution Weigh 0.1g phenol reagent dissolved in water, poured in 100ml stoppered cylinder, add water to the mark on the refrigerator, can be stable 3d. 2.2 phenol reagent use solution to absorb 5ml phenol reagent solution, add 95ml water, mix well. Pro use now with.