关键词: 重金属污染；果蔬；单因子污染指数；综合污染指数；污染源

Abstract:

Vegetable and fruit samples collected from 74 planting locations in Sanya, Hainan

Province were measured and contents of heavy metals were analyzed. Single factor

pollution index and comprehensive pollution index calculated by the national vegetable

sanitation quality standards were adopted. Heavy metal pollution level was evaluated by

Nemero index. At the same time, the pollution source was analyzed. The results showed

that all vegetable and fruit produced in  Sanya had reached clean and pollution-free

level. The comprehensive pollution index of four kinds heavy metals (Zn, Cu, Pb and Cd)

in vegetable and fruit was 0.60, which belongs to the security level of non-polluting.

But there were significant differences in enriched heavy metal contents among different

types of vegetable and fruit. The comprehensive pollution indexes of various kinds of

fruit and vegetable from big to small were as follows: green leaves

vegetable>bean>melon>rootstalk plants>eggplant>fruit. Green leave vegetables were easily

enriched to slightly polluted, and their comprehensive pollution index was 1.19. Beans

and melons were clean and close to polluted level, their comprehensive pollution indexes

were 0.85 and 0.79, respectively. Other vegetable and fruit all reached clean level.

Key words: heavy metal pollution, vegetable and fruit, single factor pollution index, comprehensive pollution index, pollution source