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ATR–FTIR detection of ≤ 25 μg/L Aqueous Cyanide, Perchlorate, and PFOS
Author(s) -
Strauss Steven H.,
Odom Matthew A.,
Hebert Gretchen N.,
Clapsaddle Brady J.
Publication year - 2002
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2002.tb09412.x
Subject(s) - aqueous solution , perchlorate , detection limit , chemistry , cyanide , attenuated total reflection , fourier transform infrared spectroscopy , analyte , nuclear chemistry , inorganic chemistry , analytical chemistry (journal) , infrared spectroscopy , chromatography , ion , organic chemistry , chemical engineering , engineering
Attenuated total reflectance–Fourier transform infrared (ATR–FTIR) sensors have been developed that can detect polyatomic anions in aqueous solution in the micrograms‐per‐litre range. The ability to detect and potentially quantify aqueous anions is important for several applications including groundwater, surface water, and wastewater testing. The surface of a commercially available ATR crystal was modified with highly selective films of organometallic extractants, resulting in sensitivity enhancements of three to five orders of magnitude relative to the unmodified crystal. No pretreatment of the aqueous solution was required for the detection and identification of three analytes. Detection limits for cyanide, perchlorate, and perfluorooctylsulfonate using the modified crystal were 5, 3, and 25 μg/L, respectively, for 60‐min analyses. The significance of this work is the prospect that a common and easily portable spectroscopic technique can be used to detect and identify aqueous anions at microgram‐per‐litre concentrations—in favorable cases even in the presence of competing anions.