关键词: 双孢蘑菇, 子实体, 重金属, 富集系数, 污染评价

Abstract: To understand pollution state of heavy metal in Agaricus bisporus fruiting body in Xuzhou area， 48 covering soils and 48 fruiting bodies were collected from 4 main plantation areas （SNGS， QSTY， JWJZ and FXHK）.Then the contents of Pb， Cd， As and Hg were determined and their pollution degrees， accumulation coefficients， edible security were analyzed. The results showed that the contents of As and Hg in QSTY and FXHK， Cd in FXHK covering soils were higher than their own background value. Only Hg content in QSTY fruiting body was more than 0005 times of the define value of national standard. SNGS and JWJZ fruiting bodies all belonged to the first product， whereas FXHK and QSTY fruiting body was the second and third product， respectively. Pollution grade of heavy metals in QSTY and FXHK fruiting bodies had reached warning grade. Accumulation ability of heavy metals in fruiting bodies among 4 main plantation areas from high to low was Hg， Cd， As and Pb， and these fruiting bodies all met hygienic standard. Thus it could be seen that the contents of 4 heavy metals in Agaricus bisporus fruiting bodies in Xuzhou area basically met the safety standard of pollution-free food．

Key words: Agaricus bisporus, fruiting body, heavy metal, accumulation coefficient, pollution evaluation