Concern about Food Safety Nowadays, food safety has gained increasing attentions, which is generally defined as a scientific discipline describing the ways of handling, preparation and storage of food products to prevent food-borne illness. Contaminants might be leaded into food products in diverse processes (production, transport and storage), such as the excessive use of pesticides or veterinary drugs, introduction of illegal additives to the food industry and toxin generation from the long-time storage. The occurrence of these contaminants can enter the food chain and further cause potential risk to human health. Moreover, food safety is not only a hot topic to human health, but also concerns the international food trade. Therefore, ultra-trace analysis of the food contaminants is one of the most urgent tasks for food safety. Ways Foods Can Be Contaminated The classification of contaminants according to stages of the life cycle of foodstuffs is the most convenient, as it well a...