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Title: Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents

Abstract

A sensor technique is described that captures analyte species on a preconcentrating minicolumn containing a selective solid phase sorbent. In this approach, the sample is pumped through the column until the sorbent phase is fully equilibrated with the sample concentration, and the exit concentration equals the inlet concentration. On-column detection of the captured analytes using radiometric and spectroscopic methods are demonstrated. In trace level detection applications, this sensor provides a steady state signal that is proportional to sample analyte concentration and is reversible. The method is demonstrated for the detection of Tc-99 using anion exchange beads mixed with scintillating beads and light detection; Sr-90 using SuperLig 620 beads mixed with scintillating beads and light detection; and hexavalent chromium detection using anion exchange beads with spectroscopic detection. Theory has been developed to describe the signal at equilibration, and to describe analyte uptake as a function of volume and concentration, using parameters and concepts from frontal chromatography. It is shown that experimental sensor behavior closely matches theoretical predictions and that effective sensors can be prepared using low plate number columns. This sensor modality has many desirable characteristics for in situ sensors for trace-level contaminant long-term monitoring where the use of consumable reagentsmore » for sensor regeneration would be undesirable. Initial experiments in groundwater matrixes demonstrated the detection of Tc-99 at drinking water level standards (activity of 0.033 Bq/mL) and detection of hexavalent chromium to levels below drinking water standards of 50 ppb.« less

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
893661
Report Number(s):
PNNL-SA-50095
KP1302000; TRN: US0606035
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Analytical Chemistry, 78(15):5480-5490
Additional Journal Information:
Journal Name: Analytical Chemistry, 78(15):5480-5490
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CHROMATOGRAPHY; CHROMIUM; DETECTION; SAMPLE PREPARATION; ADSORBENTS; TRACE AMOUNTS; TECHNETIUM 99; STRONTIUM 90; GROUND WATER; Radiomuclides; metal ions; minicolumn sensors

Citation Formats

Egorov, Oleg B, O'Hara, Matthew J, and Grate, Jay W. Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents. United States: N. p., 2006. Web. doi:10.1021/ac060355m.
Egorov, Oleg B, O'Hara, Matthew J, & Grate, Jay W. Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents. United States. doi:10.1021/ac060355m.
Egorov, Oleg B, O'Hara, Matthew J, and Grate, Jay W. Tue . "Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents". United States. doi:10.1021/ac060355m.
@article{osti_893661,
title = {Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents},
author = {Egorov, Oleg B and O'Hara, Matthew J and Grate, Jay W},
abstractNote = {A sensor technique is described that captures analyte species on a preconcentrating minicolumn containing a selective solid phase sorbent. In this approach, the sample is pumped through the column until the sorbent phase is fully equilibrated with the sample concentration, and the exit concentration equals the inlet concentration. On-column detection of the captured analytes using radiometric and spectroscopic methods are demonstrated. In trace level detection applications, this sensor provides a steady state signal that is proportional to sample analyte concentration and is reversible. The method is demonstrated for the detection of Tc-99 using anion exchange beads mixed with scintillating beads and light detection; Sr-90 using SuperLig 620 beads mixed with scintillating beads and light detection; and hexavalent chromium detection using anion exchange beads with spectroscopic detection. Theory has been developed to describe the signal at equilibration, and to describe analyte uptake as a function of volume and concentration, using parameters and concepts from frontal chromatography. It is shown that experimental sensor behavior closely matches theoretical predictions and that effective sensors can be prepared using low plate number columns. This sensor modality has many desirable characteristics for in situ sensors for trace-level contaminant long-term monitoring where the use of consumable reagents for sensor regeneration would be undesirable. Initial experiments in groundwater matrixes demonstrated the detection of Tc-99 at drinking water level standards (activity of 0.033 Bq/mL) and detection of hexavalent chromium to levels below drinking water standards of 50 ppb.},
doi = {10.1021/ac060355m},
journal = {Analytical Chemistry, 78(15):5480-5490},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {8}
}