Large Quantity EDTA Addition and Cold Storage in Dark Recommended for Preserving Inorganic Arsenic Speciation in Reducing Groundwater

Duan，Yanhua1,2,3; Liu，Jingyu2,3,4; Yang，Yuxia2,3; Han，Long2,3; Li，Zengyi2,3; Gu，Yuehong2,3; Ma，Yunjie1,2,3; Palomo，Alejandro2,3; Tuo，Xiaobao2,3; Zheng，Yan1,2,3

2024-05-10

10.1021/acsestwater.3c00619

ACS ES and T Water   影响因子和分区

2690-0637

Analysis of inorganic arsenic (iAs) species, arsenite (iAs(III)) and arsenate (iAs(V)), is recommended by authorities to select treatment technologies for noncompliant domestic well water. However, the effectiveness of various preservation methods for iAs species, including those recommended by regulatory authorities, varies with the added preservatives on-site, groundwater chemistry, and storage conditions. Here, 14 preservation methods, which include three strong acids, a range of concentrations of ethylene diamine tetraacetic acid disodium salt (EDTA) and acetic acid (HAc), three storage temperatures, and two kinds of sample bottles, were tested with 62 groundwaters spanning a wide range of chemical compositions from multiple aquifers in northwestern and southern China. Addition of EDTA to a final concentration of 20 mmol/L and storage in opaque bottles and in the dark at 4 °C preserved iAs species up to 60 days. Preservation was achieved through forming Fe-EDTA and Mn-EDTA complexes accompanied by lowering of the pH from 7.0 ± 0.5 to 5.2 ± 0.4 and eliminating photooxidation. Users are recommended to start with the best performing protocol involving adding EDTA to 20 mmol/L on-site, adjusting the EDTA dose considering the initial Fe and Mn concentrations, and final pH. Regulatory authorities are urged to examine iAs preservation protocols in their standard methods for speciation analysis.

arsenic speciation analysis arsenic treatment domestic well inorganic species preservation reducing groundwater

ESCI

英语

第一 ; 通讯

2-s2.0-85191173919

Scopus

1.Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Queensland Alliance for Environmental Health Science,University of Queensland,Brisbane,4108,Australia

Duan，Yanhua,Liu，Jingyu,Yang，Yuxia,et al. Large Quantity EDTA Addition and Cold Storage in Dark Recommended for Preserving Inorganic Arsenic Speciation in Reducing Groundwater[J]. ACS ES and T Water,2024,4(5):2031-2043.

Duan，Yanhua.,Liu，Jingyu.,Yang，Yuxia.,Han，Long.,Li，Zengyi.,...&Zheng，Yan.(2024).Large Quantity EDTA Addition and Cold Storage in Dark Recommended for Preserving Inorganic Arsenic Speciation in Reducing Groundwater.ACS ES and T Water,4(5),2031-2043.

Duan，Yanhua,et al."Large Quantity EDTA Addition and Cold Storage in Dark Recommended for Preserving Inorganic Arsenic Speciation in Reducing Groundwater".ACS ES and T Water 4.5(2024):2031-2043.