香菇对培养基中有害重金属的吸收富集规律及临界含量值

Dynamics of absorption and accumulation of Lentinula edodes accumulated heavy metals from culture medium and critical contents

选择我国出口量最大的食用菌—庆元香菇作为研究对象,在培养基中投放一定浓度的有害重金属,研究香菇对培养基中5种主要有害重金属Pb,Cd,Hg,As,Cu的吸收富集规律及临界含量值。结果表明:香菇培养基中有害重金属Cd的吸收富集相关方程为y=541.77x2.9382(x、y分别为培养基、香菇中Cd的含量),相关系数R2=0.9135,当y=1.5 mg/kg时,临界含量值x=0.135 mg/kg;Hg为y=302.19x2-20.507x+0.2962,相关系数R2=0.9984,当y=0.2 mg/kg时,临界含量值x=0.0628 mg/kg;As为y=1.7392x2+1.3433x+0.1438,相关系数R2=0.9058,当y=1.0 mg/kg时,临界含量值x=0.42 mg/kg;Cu为y=0.5974x,相关系数R2=-0.8521,当y=10 mg/kg时,临界含量值x=16.7 mg/kg;Pb为y=0.0002x2+0.0152x+0.2347,相关系数R2=0.9494,当y=2.0 mg/kg时,临界含量值x=63.3 mg/kg。富集系数Cd:为10.4-18.0,Hg为2.62-14.2,As为2.12-3.70,Cu为0.483-1.07,Pb为0.025-0.207。富集能力为Cd>Hg>As>Cu>Pb。

Lentinula edodes, which is the biggest expert amount in our country, was chosen for testing material. Five kinds of harmful heavy metals were added into the culture medium in order to study the dynamics of heavy metals absorption and accumulation. The results showed that the correlation equation of Cd absorption and accumulation is y = 541.77x^2.9382（ x and y are the content of Cd in culture medium and L. edodes, respectively）, R^2 = 0.9135. When y is 1.5 mg/kg, x is 0. 135 mg/kg; The correlation equation of Hg is y = 302.19x^2 - 20. 507x ＋ 0.2962, R^2 = 0. 9984. When y is 0.2 mg/ kg, x is 0.0628 mg/kg;The correlation equation of As is y = 1. 7392x^2 ＋ 1. 3433x ＋ 0. 1438, R^2 = 0.9058. When y is 1.0 mg/kg, x is 0.42 mg/kg; The correlation equation of Cu is y = 0. 5974x, R^2 = - 0. 8521. When y is 10 mg/kg, x is 16.7 mg/kg; The correlation equation of Pb is y = 0.0002x^2 ＋ 0.0152x ＋ 0. 2347, R^2 = 0. 9494. When y is 2.0 mg/ kg, x is 63.3 mg/kg. The accumulation coefficient was 10.4- 18.0（Cd）,2.62- 14.2（Hg）,2.11 -3.70（As）,0.483 - 1.07 （Cu）, 0.025 - 0.207（Pb）, respectively. The order of accumulation abilities is Cd 〉 Hg 〉 As 〉 Cu 〉 Pb.