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首页> 外文期刊>Chemistry: A European journal >A biomimetic approach to the chemical inactivation of chrysotile fibres by lichen metabolites
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A biomimetic approach to the chemical inactivation of chrysotile fibres by lichen metabolites

机译：地衣代谢物对温石棉纤维化学灭活的仿生方法

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Some lichens were recently reported to modify the surface state of asbestos. Here we report some new insight on the physico-chemical modifications induced by natural chelators (lichen metabolites) on two asbestos samples collected in two different locations. A biomimetic approach was followed by reproducing in the laboratory the weathering effect of lichen metabolites. Norstictic, pulvinic and oxalic acid (0.005, 0.5 and 50 mm) were put in contact with chrysotile fibres, either in pure form (A) or intergrown with balangeroite, an iron-rich asbestiform phase (B). Mg and Si removal, measured by inductively coupled plasma atomic emission spectrometry (ICP-AES) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), reveals an incongruent dissolution for pure chrysotile (A), with Mg removal always exceeding that of Si, while chrysotile-balangeroite (B) follows a congruent dissolution pattern in all cases except in the presence of 50 mM oxalic acid. A much larger removal of Mg than Si in the solutions of 0.5 and 50 mm oxalic acid with chrysotile (A) suggests a structural collapse, which in the case of chrysotile-balangeroite (B) only occurs with 50 mm oxalic acid; in these cases both samples are converted into amorphous silica (as detected by X-ray diffraction (XRD)). Subsequent to incubation, some new phases (Fe2O3, CaMg(CO3)(2), Ca(C2O4)center dot H2O and Mg(C2O4)center dot 2H(2)O), similar to those observed in the field, were detected by XRD and micro-Raman spectroscopy. ne leaching effect of lichen metabolites also modifies the Fenton activity, a process widely correlated with asbestos pathogenicity: pure chrysotile (A) activity is reduced by 50 mm oxalic acid, while all lichen metabolites reduce the activity of chrysotile-balangeroite (B). The selective removal of poorly coordinated, highly reactive iron ions, evidenced by NO adsorption, accounts for the loss in Fenton activity. Such fibres were chemically close to the ones observed in the field. Chrysotile-rich rocks, colonised by lichens, could be exposed to a natural bioattenuation and considered as a transient environmental hazard.
机译：最近报道了一些地衣改变了石棉的表面状态。在这里，我们报告了关于天然螯合剂（地衣代谢物）在两个不同位置收集的两个石棉样品诱导的物理化学修饰的一些新见解。仿生方法之后，在实验室中再现了地衣代谢产物的风化作用。将降钙石，普尔维克和草酸（0.005、0.5和50 mm）与温石棉纤维接触，这些温石棉纤维以纯净形式（A）或与富铁石棉相（B）黄铜铁矿共生。通过电感耦合等离子体原子发射光谱法（ICP-AES）和扫描电子显微镜-能量色散X射线光谱法（SEM-EDS）测量的Mg和Si的去除显示纯温石棉（A）的溶出度不一致，并且总是去除Mg除了在50 mM草酸存在下，温石型方石（B）在所有情况下都遵循一致的溶解模式。在温石棉（0.5）和50 mm草酸溶液中去除的Mg比Si大得多（A）表明存在结构塌陷，在温石-方铁矿（B）的情况下，仅在50 mm草酸中发生;在这些情况下，两个样品都转化为无定形二氧化硅（通过X射线衍射（XRD）检测）。孵育后，通过现场检测发现了一些新的相（Fe2O3，CaMg（CO3）（2），Ca（C2O4）中心点H2O和Mg（C2O4）中心点2H（2）O），与XRD和显微拉曼光谱。地衣代谢物的浸出作用还改变了Fenton活性，这一过程与石棉的致病性密切相关：纯温石棉（A）的活性降低了50 mm草酸，而所有地衣代谢物均降低了温石棉-方石（B）的活性。选择性去除配位不良，高反应性的铁离子（通过NO吸附证明）说明了Fenton活性的降低。这样的纤维在化学上接近在现场观察到的那些。由地衣定殖的富含温石棉的岩石可能会遭受自然生物衰减作用，并被视为暂时的环境危害。

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