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首页> 外文期刊>Journal of Hazardous Materials >Fractionation of metals in street sediment samples by using the BCR sequential extraction procedure and multivariate statistical elucidation of the data
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Fractionation of metals in street sediment samples by using the BCR sequential extraction procedure and multivariate statistical elucidation of the data

机译：使用BCR顺序提取程序和数据的多元统计阐明，分离街道沉积物中的金属

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摘要

The concentrations of metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in street sediment samples were determined by flame atomic absorption spectrometry (FAAS) using the modified BCR (the European Community Bureau of Reference) sequential extraction procedure. According to the BCR protocol for extracting the metals from the relevant target phases, 1.0 g of specimen of the sample was treated with 0.11 M acetic acid (exchangeable and bound to carbonates), 0.5 M hydroxylamine hydrochloride (bound to iron- and manganese-oxides), and 8.8 M hydrogen peroxide plus 1 M ammonium acetate (bound to sulphides and organics), sequentially. The residue was treated with aqua regia solution for recovery studies, although this step is not part of the BCR procedure. The mobility sequence based on the sum of the BCR sequential extraction stages was: Cd ≈ Zn (～90%) > Pb (～84%) > Cu (～75%) > Mn (～70%) > Co (～57%) > Ni (～43%) > Cr (～40%) > Fe (～17%). Enrichment factors as the criteria for examining the impact of the anthropogenic emission sources of heavy metals were calculated, and it was observed that the highest enriched elements were Cd, Pb, and Zn in the dust samples, average 190, 111, and 20, respectively. Correlation analysis (CA) and principal component analysis (PCA) were applied to the data matrix to evaluate the analytical results and to identify the possible pollution sources of metals. PCA revealed that the sampling area was mainly influenced from three pollution sources, namely; traffic, industrial, and natural sources. The results show that chemical sequential extraction is a precious operational tool. Validation of the analytical results was checked by both recovery studies and analysis of the standard reference material (NIST SRM 2711 Montana Soil).
机译：使用改良的BCR（欧洲参考局）通过火焰原子吸收光谱法（FAAS）测定街道沉积物样品中的金属（镉，钴，铬，铜，铁，锰，镍，铅和锌）的浓度。顺序提取程序。根据BCR协议从相关目标相中提取金属，将1.0 g样品样品用0.11 M乙酸（可交换并与碳酸盐结合），0.5 M盐酸羟胺（与铁和锰氧化物结合）处理），依次加入8.8 M过氧化氢和1 M乙酸铵（与硫化物和有机物结合）。残留物用王水溶液处理以进行回收研究，尽管该步骤不是BCR程序的一部分。基于BCR顺序萃取阶段总和的迁移率顺序为：Cd≈Zn（〜90％）> Pb（〜84％）> Cu（〜75％）> Mn（〜70％）> Co（〜57％ ）> Ni（〜43％）> Cr（〜40％）> Fe（〜17％）。计算了富集因子，作为检验人为排放源对重金属影响的标准，结果发现，灰尘样品中的最高富集元素分别为Cd，Pb和Zn，分别为190、111和20。 。将相关分析（CA）和主成分分析（PCA）应用于数据矩阵，以评估分析结果并确定可能的金属污染源。 PCA指出，采样区域主要受三个污染源的影响：交通，工业和自然资源。结果表明，化学顺序萃取是一种宝贵的操作工具。通过回收率研究和标准参考物质（NIST SRM 2711 Montana土壤）的分析来检查分析结果的有效性。

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