Study On The Determination And Migration Of Hazardous Chemicals In Vinegar And Packaging Materials

Toxic and harmful chemicals in food packaging may migrate to food contacted with them, which may cause undesirable effect on food. This paper established a method to determine toxic and harmful chemicals in vinegar and a method to evaluate the metal elements leaching from ceramic vinegar packaging. The procedures were applied to detect the toxic and harmful chemicals in vinegar from local market.Chapter1:The problems of vinegar and packaging safety, the factors caused metal elements leaching from ceramic packaging have been discussed; the regulations related to the metal elements in vinegar, ceramic food packaging materials and phthalates in plastic food package in different countries, as well as the study and research in this field have been reviewed; on the basis of these reviews, our own research content and the innovate were put forward.Chapter2:Microwave digestion coupled with graphite furnace atomic absorption spectrometry (GFAAS) was investigated for quantitation and determination of5trace elements (Pb,Cd,Cu,Fe,Cr) in mature vinegar. The effect of concentration of nitric acid used for working standard solutions on the signal of metal elements was studied. The best GFAAS operating condition of the5metal elements has been confirmed.The procedure developed has been applied to determination of the metal elements in vinegar with three kinds of packages.Chapter3:Microwave digestion coupled with inductively coupled plasma mass spectrometry (ICP-MS) was investigated for quantitation and determination of14trace elements (Al, Cr, Fe, Co, Cd, Mn, Cu, Zn, Ni, As, Se, Sn, Sb and Pb) in mature vinegar. The effect of different digestion acids on the recoveries was investigated, the impact of matrix and the concentration nitric acid signals of metal elements were evaluated. The procedure developed has been applied to determination of the metal elements in vinegar with three kinds of packages.Chapter4:A simultaneously determination method of19metal elements (Al, V, Cr, Mn, Co, Cu, Ga, As, Rb, Y, Zr, Cd, Te, Ce, Pr, Nd, Sm, Er and Pb) in food stimulants (4%,6%and8%(w/v) aqueous acetic acid) and two kinds of vinegar by microwave-assisted digestion and inductively coupled plasma mass spectrometry (ICP-MS) was developed. Matrix effect caused by food simulants (4%,6%and8%aqueous acetic acid) was evaluated. The effects of migration time, temperature and simulants acidity on the metal elements behavior were studies. The migration behavior of metal elements in different ceramic packaging to food stimulants and mature vinegar was analysed. In summary, the migration of metal elements from ceramic packaging to food simulants are affected by migration time, temperature and simulants acidity, according to priority. The effect of concentration of acetic acid was different for different metal elements. The metal elements have different migration behavior to different vinegar (black and white mature vinegar in this study).Chapter5:Taking vinegar with plastic packaging as analysed matrix, fifteen phthalates in thrity vinegars sold in local market were detected. In summary, the major phthalate in vinegar were dimethyl phthalate (DMP), diisobutyl phthalate (DIBP) and dibutyl phthalate (DBP), the concentration of other twelve phthalates were lower than the limit of detection.