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Determination of Disinfection By-Products Using Electrospray/Atmospheric Sampling Glow Discharge Ionization

EPA Grant Number: U915795
Title: Determination of Disinfection By-Products Using Electrospray/Atmospheric Sampling Glow Discharge Ionization
Investigators: Dalton, Christine N.
Institution: University of North Carolina
EPA Project Officer: Thompson, Delores
Project Period: December 1, 2000 through December 1, 2002
Project Amount: $61,151
RFA: STAR Graduate Fellowships (2000)
Research Category: Academic Fellowships , Fellowship - Chemistry and Materials Science , Engineering and Environmental Chemistry

Description:

Objective:

The objective of this research project is to demonstrate that identification and quantitation of polar disinfection by-products in drinking water are possible through a direct approach using electrospray/atmospheric sampling glow discharge ionization with a quadrupole ion trap mass spectrometer.

Approach:

A direct method will be developed using electrospray/atmospheric sampling glow discharge ionization (ES/ASGDI) coupled to a quadrupole ion trap mass spectrometer. Electrospray is utilized for transporting and nebulizing the sample molecules, while ionization occurs in the atmospheric sampling glow discharge ionization region. Practical instrumental conditions, such as sample pre-concentration, solvent systems, sample size, flow rate, and electrospray voltage along with optimal glow discharge ionization conditions will be investigated to determine the proper method to achieve optimal results. Once instrumental parameters have been optimized to achieve the necessary sensitivity and selectivity, reference spectra will be generated for all of the disinfection by-products of interest. With optimal parameters established, the method detection limit and the linear dynamic range will be determined to ascertain applicability of the method to trace analysis of these disinfection by-products. Once all method parameters have been finalized, applicability of this method to real sample analysis will be investigated by analyzing samples from water treatment facilities across the United States. These samples will be taken throughout the treatment process and analyzed to determine types and quantities of disinfection by-products present in various stages of water treatment.

Expected Results:

This method development will serve to circumvent the problems associated with current methodology for disinfection by-products, allowing direct determination of polar disinfection by-products by mass spectrometry.

Supplemental Keywords:

water, drinking water, water disinfection, health effects, human health, toxic substances, organics, analytical measurement methods, semi-volatile organics, polar disinfection by-products, mass spectrometry, pre-concentration, southeast. , Water, Scientific Discipline, RFA, Engineering, Chemistry, & Physics, Toxicology, Drinking Water, Health Risk Assessment, Chemistry and Materials Science, mass spectrometry, polar disinfection by-products, ES/ASGDI, health effects, disinfection byproducts (DBP), disinfection byproducts (DPBs), water disinfection, analytical measurement methods, manganese, toxic substances, human health, organics

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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