Health risk assessment and extraction behavior of heavy metals in local tea of Huangshan

The influence of brewing times,brewing time and brewing temperature on the extraction of Pb,Cu,Zn,Cd and Mn from five kinds of local tea in Huangshan was investigated,and the individual health risk assessment was also conducted in this study. Results showed that the contents of Pb and Cu in five teas were both lower than national standard. There was a positive correlationship between total extraction amount of each metal and brewing times,brewing time and brewing temperature. Discard of the first tea infusion with 1 min brewing would remove 1.75% ²8.28% of heavy metals. The health risk level of Cd produced through drinking tea infusion was the highest after three times brewing,followed by Mn,Cu,Zn and Pb. All of the five metals showed no significantly hazards to human health.