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Nanoparticles from construction wastes: A problem to health and the environment
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2019-02-11 , DOI: 10.1016/j.jclepro.2019.02.096
Marcos L.S. Oliveira , Maria Izquierdo , Xavier Querol , Roy N. Lieberman , Binoy K. Saikia , Luis F.O. Silva

The present study deals with the nano-mineralogy and geochemistry of ultrafine particles in construction waste from the Porto Alegre region in Southern Brazil. Uncontrolled construction waste dumps and poor management practices in formal disposal sites in the area may increase exposure risks to population. Whilst the physicochemical properties of construction wastes are well documented in the literature, the characteristics of nanoparticles in their formulations are not well known. Given that degradation of construction materials may unlock and enable further release of nano-particulates present, we focused on the <63 μm fraction to examine the geochemistry of inhalable nano-particulates that could cause adverse health impacts on local communities. A particular feature across the studied wastes are the numerous aerodynamically favourable, spherical-shaped nanoparticles of magnetite, rutile and anatase. The detected nanoparticles contained a number of elements including Al, As, Au, Ca, Cd, Co, Cr, Cu, Hg, Na, Fe, K, S, Sn, Si and. An enrichment in metals and metalloids such as As, Co, Cr, Cu, Hg, Fe, Sn or Ta in particles in the nano-scale range in relation to larger particles was observed. The presence of carbon nanotubes was also noted. The leaching tests showed that the construction wastes did not reach the limits for their disposal as hazardous waste according the European Directive. Whilst the majority of trace elements were highly immobile, the water extractability for oxyanionic-forming metalloids suggests possible migration to surface and groundwater bodies. This work seeks to bring awareness on the impacts of unsustainable construction waste management, and the relevance of improved regulations regarding their final disposal.



中文翻译:

建筑废料中的纳米颗粒:健康和环境问题

本研究涉及巴西南部阿雷格里港地区建筑废料中超细颗粒的纳米矿物学和地球化学。在该地区正规的处置场内,不受控制的建筑垃圾场和管理不善的做法可能会增加人口暴露的风险。尽管建筑垃圾的物理化学性质在文献中有充分的文献记载,但纳米粒子在其配方中的特性尚不为人所知。鉴于建筑材料的降解可能会释放并允许进一步释放存在的纳米颗粒,因此我们重点研究了小于63μm的部分,以研究可吸入的纳米颗粒的地球化学,这可能会对当地社区造成不利的健康影响。在研究的废物中,一个特别的特点是空气动力学方面的优势,球形的磁铁矿,金红石和锐钛矿型纳米颗粒。检测到的纳米颗粒包含许多元素,包括Al,As,Au,Ca,Cd,Co,Cr,Cu,Hg,Na,Fe,K,S,Sn,Si和。观察到相对于较大的颗粒,纳米级范围内的颗粒中的金属和准金属如As,Co,Cr,Cu,Hg,Fe,Sn或Ta的富集。还注意到了碳纳米管的存在。浸出试验表明,建筑废料未达到欧洲指令规定的危险废物处理极限。虽然大多数痕量元素高度固定,但形成氧阴离子的类金属的水萃取性表明可能迁移至地表和地下水体。这项工作旨在提高人们对不可持续的建筑废料管理的影响的认识,

更新日期:2019-02-11
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