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Title: Evaluating the efficacy of DGT to quantify copper in stormwater at end-of-pipe

Abstract

In many cases, stormwater compliance monitoring is labor intensive, expensive, and largely unsuccessful in providing the data needed to support stormwater management goals. To help address these issues, diffusive gradients in thin film (DGTs), time-integrative passive samplers for metals, were evaluated to monitor copper in stormwater runoff. DGTs were co-located with traditional autosamplers within the stormwater conveyance systems at Naval Base San Diego (NBSD) to provide a direct comparison with composite sampling. DGTs were exposed in the laboratory to flow-averaged composite samples from NBSD stormwater conveyance systems. These experiments showed increasing uptake over time (range = 1.5 to 24 h) for copper, with positive, linear correlations (r2>0.980) between exposure duration and copper mass accumulated. However, it appears that the corresponding calculations of the DGT-labile fraction (CDGT) relative to the dissolved fraction fluctuated across the different exposure durations. In general, trends observed for CDGT measurements from the field were consistent with trends in the lab DGT exposures and traditional dissolved metal measurements from composite samples. Finally, time-weighted average copper concentrations from DGTs deployed for the first and second parts of storm events were within 30% of measurements from DGTs that were deployed for the entire storm event in the same stormwatermore » vault. Cumulatively, these results show promise for continuous monitoring with DGTs as an approach that produces data more representative of exposure to the receiving environment during episodic events than data from traditional grab or composite chemistry sampling, and can represent significant cost savings.« less

Authors:
 [1];  [1]; ORCiD logo [2]
  1. SPAWAR
  2. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1548277
Report Number(s):
PNNL-SA-142996
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemosphere
Additional Journal Information:
Journal Volume: 235
Country of Publication:
United States
Language:
English
Subject:
Diffusive Gradient in Thin Films, stormwater, trace metals

Citation Formats

Hayman, Nicholas, Rosen, Gunther, and Strivens, Jonathan E. Evaluating the efficacy of DGT to quantify copper in stormwater at end-of-pipe. United States: N. p., 2019. Web. doi:10.1016/j.chemosphere.2019.07.009.
Hayman, Nicholas, Rosen, Gunther, & Strivens, Jonathan E. Evaluating the efficacy of DGT to quantify copper in stormwater at end-of-pipe. United States. doi:10.1016/j.chemosphere.2019.07.009.
Hayman, Nicholas, Rosen, Gunther, and Strivens, Jonathan E. Fri . "Evaluating the efficacy of DGT to quantify copper in stormwater at end-of-pipe". United States. doi:10.1016/j.chemosphere.2019.07.009.
@article{osti_1548277,
title = {Evaluating the efficacy of DGT to quantify copper in stormwater at end-of-pipe},
author = {Hayman, Nicholas and Rosen, Gunther and Strivens, Jonathan E.},
abstractNote = {In many cases, stormwater compliance monitoring is labor intensive, expensive, and largely unsuccessful in providing the data needed to support stormwater management goals. To help address these issues, diffusive gradients in thin film (DGTs), time-integrative passive samplers for metals, were evaluated to monitor copper in stormwater runoff. DGTs were co-located with traditional autosamplers within the stormwater conveyance systems at Naval Base San Diego (NBSD) to provide a direct comparison with composite sampling. DGTs were exposed in the laboratory to flow-averaged composite samples from NBSD stormwater conveyance systems. These experiments showed increasing uptake over time (range = 1.5 to 24 h) for copper, with positive, linear correlations (r2>0.980) between exposure duration and copper mass accumulated. However, it appears that the corresponding calculations of the DGT-labile fraction (CDGT) relative to the dissolved fraction fluctuated across the different exposure durations. In general, trends observed for CDGT measurements from the field were consistent with trends in the lab DGT exposures and traditional dissolved metal measurements from composite samples. Finally, time-weighted average copper concentrations from DGTs deployed for the first and second parts of storm events were within 30% of measurements from DGTs that were deployed for the entire storm event in the same stormwater vault. Cumulatively, these results show promise for continuous monitoring with DGTs as an approach that produces data more representative of exposure to the receiving environment during episodic events than data from traditional grab or composite chemistry sampling, and can represent significant cost savings.},
doi = {10.1016/j.chemosphere.2019.07.009},
journal = {Chemosphere},
number = ,
volume = 235,
place = {United States},
year = {2019},
month = {11}
}