贵州万山汞矿区苔藓植物对汞的吸附和富集特征

在所设定的贵州万山汞矿区调查范围内,有6种苔藓植物,其中常见种为东亚褶叶藓和大羽藓.结果表明,苔藓能高度富集汞,东亚褶叶藓和大羽藓的汞含量随污染源距离和相对高度的增加而降低;不同苔藓对汞的吸附等温线具共同性,吸附量随平衡液浓度的增加而增大,东亚褶叶藓对Hg的吸附量比大羽藓大,吸附特征都能用Liner、Freundlic...

Study on the Characteristics of Adsorption and Enrichment of Mercury by the Mosses in Mining Districts in Wanshan Guizhou

Six mosses in Hg mining district of Wanshan,Guizhou,including Palamoclaodium sciureum (Mitt.) Broth and Thuidium cymbifolium (Doz. etMolk.) B.S.W,were sampled to study their adsorption and accumulation of mercury (Hg).The results showed that the mosses could enrich Hg,and Hg concentrations of P.sciureumand T.cymbifolium were decreased with the augmentation of the pollution-source distance.The mosses have commonness in the adsorption isotherm for Hg and the adsorption quantity increased with the density of the equilibrium solution.The adsorption quantity of P.sciureum was higher than that of T.cymbifolium.The adsorption characteristics fit well with the Liner equation,Freundlich equation and Langmuir equation,and the best fitting was Langmuir equation(R=0.9926 and R=0.9769).The adsorption quantity of P.sciureum and T.cymbifolium were 356.24 mg·g^-1 and 236.72 mg·g^-1 respectively.The adsorption kinetic characteristics showed that the adsorption quantity increased with the augmentation of Hg density.The adsorption increased fast in the initial 0.5 h and reached the maximum adsorption at 2 h.The mathematic model showed that the Exponent equation and Elovich equation could commendably fit the Hg adsorption dynamics of P.sciureum and T.cymbifolium(R=0.9541 and R=0.9996).