Zagury Gérald J, Dobran Simona, Estrela Sandra, Deschênes Louise
Department of Civil, Geological and Mining Engineering, Department of Chemical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, Québec H3C 3A7, Canada.
Environ Toxicol Chem. 2008 Apr;27(4):799-807. doi: 10.1897/07-305.1.
The environmental impact of chromated copper arsenate (CCA)-treated utility poles is linked to the possible soil and groundwater contamination with arsenic. The objective of the present study was to determine the arsenic speciation in soil and groundwater near in-service CCA-treated poles. Arsenite (As[III]) and arsenate (As[V]) concentrations were determined in 29 surface and subsurface soil samples collected near eight CCA-treated wood poles. Temporal variability of total arsenic concentrations and inorganic arsenic speciation was also assessed in groundwater at two sites through four sampling events over a 19-month period. Arsenic speciation was carried out by a solvent extraction method using ammonium pyrrolidine dithiocarbamate-methyl isobutyl ketone, and total arsenic was quantified by inductively coupled plasma/atomic emission spectrometry/hydride generation. Average arsenic concentrations in surface soils immediately adjacent to utility poles ranged from 153+/-49 to 410+/-150 mg/kg but approached background levels (below 5 mg/kg) within 0.50 m from the poles. A positive correlation was found between surface soil As concentration and total Fe content. In subsurface samples (0.50 m), arsenic levels were generally high in sandy soils (up to 223+/-32 mg/kg), moderate in clayey soils (up to 126+/-26 mg/kg), and relatively lower in organic soils (up to 56+/-24 mg/ kg). Arsenic(V) was the predominant arsenic species in surface (>78%) and subsurface soils (>66%). Total arsenic concentrations in groundwater below the clayey site were high and varied widely over time (79-390 microg/L), with 30 to 68% as As(III). Below the utility pole located on the organic site with a high Fe content, lower total arsenic levels (12-33 microg/L) were found, with As(III) ranging from 0 to 100%.
铬酸铜砷（CCA）处理过的电线杆对环境的影响与土壤和地下水可能受到砷污染有关。本研究的目的是确定在用CCA处理过的电线杆附近土壤和地下水中砷的形态。测定了从8根CCA处理过的木杆附近采集的29个表层和亚表层土壤样品中的亚砷酸盐（As[III]）和砷酸盐（As[V]）浓度。还通过在19个月内的4次采样事件，对两个地点的地下水中总砷浓度和无机砷形态的时间变化进行了评估。采用吡咯烷二硫代氨基甲酸铵-甲基异丁基酮溶剂萃取法进行砷形态分析，并用电感耦合等离子体/原子发射光谱法/氢化物发生法对总砷进行定量。紧邻电线杆的表层土壤中砷的平均浓度范围为153±49至410±150毫克/千克，但在距电线杆0.50米范围内接近背景水平（低于5毫克/千克）。发现表层土壤砷浓度与总铁含量之间呈正相关。在亚表层样品（0.50米）中，砂质土壤中的砷含量一般较高（高达223±32毫克/千克），黏质土壤中的砷含量适中（高达126±26毫克/千克），有机土壤中的砷含量相对较低（高达56±24毫克/千克）。砷（V）是表层（>78%）和亚表层土壤（>66%）中主要的砷形态。黏质场地下方地下水中的总砷浓度较高，且随时间变化差异很大（79 - 390微克/升），其中30%至68%为As（III）。在铁含量高的有机场地的电线杆下方，发现总砷水平较低（12 - 33微克/升），As（III）的含量范围为0至100%。
