ICP-MS Analysis on mineral and heavy metal elements

The contents of 10 minerals and heavy metal elements，including B，Pb，Cu，Cr，Cd，Zn，Fe，Mn，Ca and Mg in Guangdong Dongyuan hakka traditional roasted green tea（ Jinxuan variety） were determined by inductively coupled plasma-mass spectrometry（ ICP-MS） with microwave-assisted digestion pretreatment，and corresponding analysis was carried out. The results showed that these samples contained rich mineral elements，Ca and Mg content were higher on the whole，and the next was Fe，Zn and Mn. Jinxuan samples planted in the same year had different mineral elements contents in different seasons. Ca content in hot summer and autumn tea was significant higher than that in spring and summer tea. Tendency of Mg content was similar with that of Ca. The result of heavy metal showed that Pb content did not exceed the national standard. Totally，samples made in 2012 contained higher heavy metal than samples made in other years，as well as samples made with the same place and variety. This research evaluated elements status in hakka roasted green tea of Dongyuan，Guangdong and laid foundation for origin traceability research on Dongyuan hakka green tea；at the same time，this research had important significance for evaluating hakka green tea quality and safety.