Abstract:

From this study, we try to find out the scientific support for the safety assessment of the Myrica rubra by investigating the pollution level of Pb, Cd, As and Hg 4 elements in Myrica rubra fruit, which was collected from the main Myrica rubra production areas in Zhejiang Province. And it is also the basis of studying the heavy metal pollution ways and the controlling methods. 128 samples of Myrica rubra Fruits in 13 counties of Zhejiang Province was assayed, evaluated and compared with national standard. We detect the content of Pb and Cd by using the Thermo Solar S4-type graphite furnace atomic absorption spectrometry after the wet digestion, detect As and Hg by using the AFS-930 type atomic fluorescence spectrometer after the pressure digestion. The results showed that the detection rates of Hg, As, Pb, Cd were 100% and average concentration of Hg, As, Pb, Cd was 0.0036, 0.0290, 0.1400, 0.0120 mg/kg respectively. The ratio of concentration and criterion of four elements in fruits was Pb（70%）, Cd（40%）, Hg（35.8%）, As（5.8%）respectively. There were some differences of concentration of Hg, As, Pb, Cd in different regions. The order of the single-factor pollution index of heavy metal determined was Pb>Cd>Hg>As, and the order of the integration pollution index of Myrica rubra Fruits was free from pollution while the polluted status by the heavy metal in Qingtian county was light.