Using metal oxide coated internal reflection elements to enhance the detection limits of attenuated ...

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" Using metal oxide coated internal reflection elements to enhance the detection limits of attenuated total reflectance infrared spectroscopy: Procedures and applications "
Brian McAuley

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	52762
Doc. No	:	TL22716
Call number	:	‭3329464‬
Main Entry	:	Brian McAuley
Title & Author	:	Using metal oxide coated internal reflection elements to enhance the detection limits of attenuated total reflectance infrared spectroscopy: Procedures and applications\ Brian McAuley
College	:	The University of New Mexico
Date	:	2008
Degree	:	Ph.D.
student score	:	2008
Page No	:	187
Abstract	:	Arsenic is found as a contaminant in drinking water throughout the United States (particularly in parts of the midwestern and western U.S. (1)) and other countries (such as Bangladesh and India) (2,3); chronic exposure to arsenic may lead to various health issues including various types of cancer, peripheral vascular disease, and diabetes (2). In this text I demonstrate the applicability of using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) to monitor aqueous arsenic levels. The inherent problem of using ATR-FTIR for this purpose is that it has relatively high limits of detection (LOD) (typical LODs are around 100 ppm), which is defined as 3 times the standard deviation of the calibration curve. The high LOD of ATR-FTIR is problematic when trying to quantify par-per-billion (ppb) levels of arsenic in aqueous solution. The solution is to coat the internal reflection element (IRE) of the ATR cell with a metal oxide which will adsorb the arsenic thus increasing the intrinsic concentration of the arsenic near the IRE surface. This technique is also applicable to monitoring other oxoanions of interest such as sulfate and selenate and it is assumed that similar techniques could be used on anions such as phosphate or perchlorate. In addition to its use as a dectector metal oxide coated ATR-FTIR cells have been used to acquire data about the binding of various analytes to the iron oxide coatings. Increased understanding of the nature of the analyte binding as well as the kinetics of the adsorption process may be used to develop models for analyte transport.
Subject	:	Pure sciences; Metal oxide; Internal reflection; Detection limits; FTIR; Arsenate; Analytical chemistry; 0486:Analytical chemistry
Added Entry	:	The University of New Mexico