Arsenic and sulfur nanoparticle synthesis mimicking environmental conditions of submarine shallow-water hydrothermal vents  

作　　者：Vicente Durán-Toro Kurosch Rezwan Solveig I.Bühring Michael Maas 

机构地区：[1]MARUM–Center for Marine Environmental Sciences,University of Bremen,Bremen 28359,Germany [2]Advanced Ceramics,University of Bremen,Bremen 28359,Germany [3]MAPEX-Center for Materials and Processes,University of Bremen,Bremen 28359,Germany

出　　处：《Journal of Environmental Sciences》2022年第1期301-312,共12页环境科学学报（英文版）

基　　金：supported by Conicyt through a fellowship to VDT(Programa de Capital Humano Avanzado,BECASChile,CONICYT,72160570 Res.Convenio 7359/2015);by the Deutsche Forschungsgemeinschaft(DFG,Germany)through the Emmy Noether Program(grant BU 2606/1-1 to SIB)。

摘　　要：Arsenic and sulfur mineralization is a natural phenomenon occurring in hydrothermal systems where parameters like temperature and organic matter(OM)can influence the mobilization of the toxic metalloid in marine environments.In the present study we analyze the influence of temperature and OM(particularly sulfur-containing additives)on As and S precipitation based on the recent discovery of As-rich nanoparticles in the hydrothermal system near the coast of the Greek island Milos.To this end,we experimentally recreate the formation of amorphous colloidal particles rich in As and S via acidification(pH 3–4)of aqueous precursors at various temperatures.At higher temperatures,we observe the formation of monodisperse particles within the first 24 h of the experiment,generating colloidal particles with diameters close to 160 nm.The S:As ratio and particle size of the synthetized particles closely correlates with values for As_(x)S_(y)particles detected in the hydrothermal system off Milos.Furthermore,organic sulfur containing additives(cysteine and glutathione,GSH)are a key factor in the process of nucleation and growth of amorphous colloidal As_(x)S_(y)particles and,together with the temperature gradient present in shallow hydrothermal vents,dictate the stabilization of As-bearing nanomaterials in the environment.Based on these findings,we present a simple model that summarizes our new insights into the formation and mobility of colloidal As in aquatic ecosystems.In this context,amorphous As_(x)S_(y)particles can present harmful effects to micro-and macro-biota not foreseen in bulk As material.

关 键 词：BIOMINERALIZATION Milos Hydrothermal vent ARSENIC SULFUR Nanoparticles ECOTOXICOLOGY 

分 类 号：X55[环境科学与工程—环境工程]