移植的苔藓已被广泛证明是生物监测空气污染的绝佳工具;然而,尚不清楚存在于其表面上的官能团如何影响金属阳离子的吸收。在本研究中,我们研究了两种陆生苔藓和一种水生苔藓中痕量金属积累的差异,并研究了差异是否取决于它们的物理化学特性。在实验室里,我们确定了C,并获得其组织中N和H含量的ATR-FTIR光谱(以鉴定官能团的存在)。我们还用Cd进行了表面酸碱滴定和金属吸附测定,Cu和Pb。在田野里,我们在不同的空气污染行业附近暴露了每个物种的移植,并确定了铝的苔藓富集,Cd,Co,Cr,Cu,Fe,Ni,Pb和V。实验室结果表明,陆生苔藓泥炭藓和假硬化紫癜中的金属吸收能力更高,与水生苔藓中的解热Fontinalis相比,这可以归因于陆地苔藓表面上更大量的酸性官能团(即带负电荷的结合位点)。苔藓对某些元素的亲和力取决于表面官能团的丰度和性质。因此,与其他物种相比,S.palustre移植中的金属浓度通常达到更高的水平,除了汞的吸收,在解热F.中更高。然而,研究结果还表明,环境类型(陆地或水生)与苔藓特征之间存在相互作用,这可能会影响上述趋势。因此,不管物理化学特征如何,金属的吸收取决于苔藓“即大气或水生”的起源环境。换句话说,研究结果表明,在陆地环境中积累更多金属的物种将在水生环境中积累更少的金属,反之亦然。
Transplanted mosses have been widely shown to be excellent tools for biomonitoring air pollution; however, it is not clear how the functional groups present on their surfaces affect the uptake of metal cations. In the present study, we examined differences in trace metal accumulation in two terrestrial and one aquatic moss species, and investigated whether the differences depended on their physico-chemical characteristics. In the laboratory, we determined C, N and H contents in their tissues and obtained the ATR-FTIR spectra (to identify the presence of functional groups). We also conducted surface acid-base titrations and metal adsorption assays with Cd, Cu and Pb. In the field, we exposed transplants of each species near different air-polluting industries, and determined the mosses enrichment of Al, Cd, Co, Cr, Cu, Fe, Ni, Pb and V. Laboratory results demonstrated higher metal uptake capacity in the terrestrial mosses Sphagnum palustre and Pseudoscleropodium purum, compared to that in the aquatic moss Fontinalis antipyretica, which can be attributed to a greater abundance of acidic functional groups (i.e. negatively charged binding sites) on the surface of the terrestrial mosses. The affinity of moss for certain elements depends on the abundance and nature of surface functional groups. Accordingly, the metal concentrations generally reached higher levels in S. palustre transplants compared to the other species, except for the uptake of Hg, which was higher in F. antipyretica. However, the findings also suggest an interaction between the type of environment (terrestrial or aquatic) and the moss characteristics that may influence the abovementioned trend. Thus, irrespective of the physico-chemical characteristics, metal uptake varied depending on the environment of origin of the mosses \"i.e. atmospheric or aquatic\". In other words, the findings suggest that species that accumulate more metals in terrestrial environments will accumulate lower amounts of metals in aquatic environments and vice versa.