Evaluation and application of the diffusive gradients in thin films technique (DGT) using a mixed-binding gel layer for measuring inorganic arsenic and metals in mining impacted water and soil

Huynh, Trang, Zhang, Hao and Noller, Barry (2012) Evaluation and application of the diffusive gradients in thin films technique (DGT) using a mixed-binding gel layer for measuring inorganic arsenic and metals in mining impacted water and soil. Analytical Chemistry, 84 22: 9988-9995. doi:10.1021/ac302430b


Author Huynh, Trang
Zhang, Hao
Noller, Barry
Title Evaluation and application of the diffusive gradients in thin films technique (DGT) using a mixed-binding gel layer for measuring inorganic arsenic and metals in mining impacted water and soil
Journal name Analytical Chemistry   Check publisher's open access policy
ISSN 0003-2700
1520-6882
Publication date 2012-10-22
Sub-type Article (original research)
DOI 10.1021/ac302430b
Volume 84
Issue 22
Start page 9988
End page 9995
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Formatted abstract
The diffusive gradients in thin films (DGT) equipped with a Chelex or ferrihydrite binding gel has been designed to enable the measurement of either labile metal species or inorganic arsenic, respectively. In the mine impacted environment, metals and metalloids commonly coexist in a variety of species. This study, for the first time reports the performance of the DGT with a mixed-binding layer (MBL), consisting of Chelex and ferrihydrite for measurements of both metals and arsenic in a single assay. The MBL that consists of a combination of Chelex and ferrihydrite at a ratio of 1:2 has the greatest binding capacity for arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn). The elemental concentrations measured by using MBL-DGT (CDGT) were comparable (92–104%) with the original test solution concentrations (CSOL). The measurement of As by using MBL-DGT was consistent across a wide pH range (3–8) and ionic strength (0.001–0.1 M). At high pH (9), As measurement was slightly affected (80%). The measurements of Cd, Pb, and Zn were affected at low pH (<3) and high pH (9). Measurements of Cd, Cu, and Pb were affected at low ionic strength (0.001 M). At high ionic strength (0.1 M), measurements of Cd; Cu and Pb were slightly affected. The capacity of MBL-DGT for quantitative measurement in a multielements solution is effectively limited to 15 μg for As and 70 μg for metals per MBL-DGT device. Good correlations (p < 0.01) between MBL-DGT measurements and ferrihydrite or Chelex DGT were obtained for As, Cd, Cu, Pb, and Zn in water and soil with exception for Cd and Cu (p < 0.05) when deployed in soil.
Keyword In Situ Measurements
Trace Metals
Performance characteristics
Fresh Waters
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2013 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 06 Dec 2012, 20:30:33 EST by Dr Trang Huynh on behalf of Centre For Mined Land Rehabilitation