Milk and milk-based products are an important source of nutrients in the human diet, especially for infants and children. Milk products are widely consumed in many parts of the world. As tastes change and incomes rise, the popularity of dairy products in many Asian and developing countries is rising. With increased production to meet the growing demand, product quality is important. The levels of major elements such as Na, K, Mg, Ca, and essential elements such as Se, P, Mn, Zn, are measured to provide valuable nutritional information. Potentially toxic elements such as As, Cd, Sn, Hg and Pb are also measured in animal-derived milk, to monitor potential contamination from soil, fertilizer, animal feed, or processing equipment. Agilent ICP-MS instruments are widely used in environmental and food testing laboratories due to their exceptional sensitivity, fast multi-elementanalysis and wide elemental coverage. Recent developments have extended the analytical dynamic range of the Agilent 7900 ICP-MS to more than ten orders of magnitude, allowing routine measurement of major elements (such as Na, K and Ca) in milk, in the same analytical run as the trace elements. Agilent 7900 電感耦合等離子體質(zhì)譜儀