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| Bioaccumulation of Four Kinds of Heavy Metals in Different Varieties of Pleurotus spp. and Safety Limits in Culture Substrate |
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| KeyWord:Pleurotus spp.; culture substrate; heavy metal; bioaccumulation; safety limits |
| Author Name | Affiliation | | YANG Xiao-hong | Laboratory of Quality ＆ Safety Risk Assessment for Microbial Products, Ministry of Agriculture, P.R.China, Beijing 100081, China | | CHEN Hui-jun | Laboratory of Quality ＆ Safety Risk Assessment for Microbial Products, Ministry of Agriculture, P.R.China, Beijing 100081, China | | LI Jun | Laboratory of Quality ＆ Safety Risk Assessment for Microbial Products, Ministry of Agriculture, P.R.China, Beijing 100081, China | | ZOU Ya-jie | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | HU Qing-xiu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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| Abstract: |
| Pleurotus spp. is the most popular edible mushroom in China, but often accumulates large amounts of heavy metals from culturing substrates. In this study, different concentrations of lead, mercury, arsenic and cadmium were added to two culturing substrates to examine their bioaccumulation in three varieties of Pleurotus spp.. Accumulation of heavy metals in Pleurotus spp. decreased in order: Cd>As, Hg>Pb. Of three Pleurotus spp., P-8 was found to be the lowest accumulator of four heavy metals. In accordance to Pb, Hg and As Health Standards for Edible Fungi（GB 7096—2003） and Cd Standard for Green Food（NY 749—2012）, the safety limits for heavy metals were obtained when the same Pleurotus spp. variety was grown in different substrates or different Pleurotus spp. varieties were grown in the same substrate. The values of Pleurotus spp. P-25′, P-5′ and P-8 were respectively 99.56, 74.37 mg·kg-1 DW, and 58.56 mg·kg-1 DW for Pb; 0.21, 0.13 mg·kg-1 DW, and 0.21 mg·kg-1 DW for Cd; 0.08, 0.07 mg·kg-1 DW, and 0.29 mg·kg-1 DW for Hg; and 1.31, 2.72 mg·kg-1 DW and 1.85 mg·kg-1 DW for As in cottonseed hull substrates. In corn cob, the limit of Pb was 83.64 mg·kg-1 DW for P-8 and that of Cd was 0.08, 0.07 mg·kg-1 DW, and 0.27 mg·kg-1 DW for P-25′, P-5′ and P-8 strains. |
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