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DEMONSTRATION AND VALIDATION OF A PORTABLE RAMAN SENSOR FOR IN-SITU DETECTION AND MONITORING OF PERCHLORATE (ClO4-)
Gu, B., A. Jubb, G. Eres, and P.B. Hatzinger.
ESTCP Project ER-201327, 107 pp, 2017
A portable Raman sensor based on surface-enhanced Raman scattering (SERS) technology and elevated gold nano-ellipse dimer architectures was designed and developed for a perchlorate detection limit of ~100 µg/L in contaminated water. Large-scale commercial production of SERS substrate sensors via nanoimprinting was successfully demonstrated—a major step toward commercialization of the SERS sensors. Commercially produced SERS sensors were demonstrated to detect perchlorate at levels above 100 µg/L using a portable Raman analyzer. Performance of the commercial SERS sensors for perchlorate detection in the presence and absence of interferences was determined for a series of standard solutions. Sulfate exhibited the greatest interference among the anions tested. Field demonstration of the sensor with commercially produced SERS substrates was completed twice at the Indian Head Naval Surface Warfare Center and once at Redstone Arsenal. Multiple wells were sampled at both sites and results were compared with those from a standard ion chromatography approach. Results generally were comparable, but significant variations due to the presence of interference ions and co-contaminants in the groundwater in some samples were observed. https://www.estcp.com/content/download/45404/423920/file/ER-201327%20Final%20Report.pdf
ESTCP Project ER-201327, 107 pp, 2017
A portable Raman sensor based on surface-enhanced Raman scattering (SERS) technology and elevated gold nano-ellipse dimer architectures was designed and developed for a perchlorate detection limit of ~100 µg/L in contaminated water. Large-scale commercial production of SERS substrate sensors via nanoimprinting was successfully demonstrated—a major step toward commercialization of the SERS sensors. Commercially produced SERS sensors were demonstrated to detect perchlorate at levels above 100 µg/L using a portable Raman analyzer. Performance of the commercial SERS sensors for perchlorate detection in the presence and absence of interferences was determined for a series of standard solutions. Sulfate exhibited the greatest interference among the anions tested. Field demonstration of the sensor with commercially produced SERS substrates was completed twice at the Indian Head Naval Surface Warfare Center and once at Redstone Arsenal. Multiple wells were sampled at both sites and results were compared with those from a standard ion chromatography approach. Results generally were comparable, but significant variations due to the presence of interference ions and co-contaminants in the groundwater in some samples were observed. https://www.estcp.com/content/download/45404/423920/file/ER-201327%20Fin
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