知识与财富的链接
目的 研究微波条件下陶瓷食品接触材料中有害重金属的迁移行为。方法 向陶瓷餐具中装入乙酸溶液, 进行常规处理和微波加热处理, 最后用火焰原子吸收分光光度计检测, 研究微波功率、加热时间和迁移液pH值对陶瓷餐具中铅、镉向乙酸溶液迁移的影响, 并将该方式与常规方式作对比。结果 铅、镉的迁移量随微波功率和加热时间的增加而增大, 并基本在加热15 min后达到迁移平衡; 微波功率不但影响铅、镉的迁移速度, 还影响其达到迁移平衡时的浓度; 铅、镉的迁移量随迁移液pH值的降低而增大。结论 通过短时间的微波加热, 即可使铅、镉的迁移量达到甚至显著超出(22?2)℃温度下浸泡24 h?20 min的迁移量。
Objective To study the migration of hazardous heavy metals from ceramic food contact material during microwave heating. Methods Ceramic dinnerware was treated by microwave heating, and the inference of microwave power, heating time and pH to the migration of lead and cadmium into acetic acid was studied. Results The amount of migration of lead and cadmium increased with the increase of microwave power and heating time, and generally reached equilibrium after heating for 15 min. Microwave power not only affected the migration velocity of lead and cadmium, but also their concentrations at migration equilibrium. The amount of migration of lead and cadmium increased with the decrease of pH. Conclusion By microwave heating for merely a short time, the amount of migration of lead and cadmium could reach, or even significantly excess that acquired in traditional migration condition, i.e. soaked with 4 % acetic acid for 24 h±20 min at (22±2)℃.