« Previous AbstractInvestigation of Exhaled Breath Samples from Patients with Alzheimer's Disease Using Gas Chromatography-Mass Spectrometry and an Exhaled Breath Sensor System    Next AbstractCommuter exposure to aromatic VOCs in public transportation modes in Hong Kong »

Environ Sci Technol

Title:		Disinfection Byproduct Recovery during Extraction and Concentration in Preparation for Chemical Analyses or Toxicity Assays
Author(s):		Lau SS; Forster AL; Richardson SD; Mitch WA;
Address:		"Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, California 94305, United States. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States"
Journal Title:		Environ Sci Technol
Year:		2021
Volume:		20211007
Issue:		20
Page Number:		14136 - 14145
DOI:		10.1021/acs.est.1c04323
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Over 700 disinfection byproducts (DBPs) have been identified, but they account for only approximately 30% of total organic halogen (TOX). Extracting disinfected water is necessary to assess the overall toxicity of both known and unknown DBPs. Commonly used DBP extraction methods include liquid-liquid extraction (LLE) and solid-phase extraction (SPE), which may use either XAD resins or other polymeric sorbents. With few exceptions, DBP recoveries have not been quantified. We compared recoveries by LLE, XAD resins, and a mixture of Phenomenex Sepra SPE sorbents (hereafter SPE) for (semi-)volatile DBPs and nonvolatile model compounds at the 1-L scale. We scaled up the three methods to extract DBPs in 10 L of chlorinated creek waters. For (semi-)volatile DBPs, XAD resulted in lower recoveries than LLE and SPE at both 1- and 10-L scales. At the 10-L scale, recovery of certain trihalomethanes and trihalogenated haloacetic acids by XAD was negligible, while recovery of other (semi-)volatile DBPs extracted by XAD (<30%) was lower than by SPE or LLE (30-60%). TOX recovery at the 10-L scale was generally similar by the three extraction methods. The low TOX recovery (<30%) indicates that the toxicity assessed by bioassays predominantly reflects the contribution of the nonvolatile, hydrophobic fraction of DBPs"
Keywords:		"*Disinfectants Disinfection Halogenation Trihalomethanes/analysis *Water Pollutants, Chemical/analysis *Water Purification XAD resin extraction disinfection byproducts extraction methods liquid-liquid extraction solid-phase extraction;"
Notes:		"MedlineLau, Stephanie S Forster, Alexandria L Richardson, Susan D Mitch, William A eng Research Support, U.S. Gov't, Non-P.H.S. 2021/10/08 Environ Sci Technol. 2021 Oct 19; 55(20):14136-14145. doi: 10.1021/acs.est.1c04323. Epub 2021 Oct 7"