Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 409, Issue 2, Pages 314-325Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2010.10.010
Keywords
Taste and odor compounds; Purge-and-trap; GC-MS; Cyanobacterial blooms; Lake Taihu
Categories
Funding
- Chinese Academy of Sciences [KZCX1-YW-14-6-1]
- National Basic Research Program of China [2008CB418101]
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A systematic study was conducted on seasonal and spatial patterns of taste and odor (T&O) compounds with relation to biotic and abiotic parameters at fifteen sites in Gonghu Bay of Lake Taihu in 2008. We developed a sensitive and automated method to simultaneously analyze eight T&O compounds (boiling points ranging from 38 degrees C to 239 degrees C) by using Purge-and-Trap (P&T) coupled with GC/MS. Maximum particulate dimethyl trisulfide (DMTS, 69.6 ng/L) exceeded its odor threshold concentrations (OTC, 10 ng/L) and maximum dissolved DMTS was 6.1 ng/L, but still far below concentration in the drinking water pollution incident of Wuxi City in 2007 when DMTS reached 1768-11,399 ng/L Geosmin (CEO), 2-methylisoborneol (MIB), beta-cyclocitral, beta-ionone and 2-isobutyl-3-methoxypyrazine (IBMP) occasionally or frequently exceeded their OTCs, whereas 2-isopropyl-3-methoxypyrazine (IPMP) and dimethyl sulfide (DMS) did not. We found for the first time significant correlations between particulate beta-cyclocitral and beta-ionon concentrations and intracellular and extracellular microcystin concentrations. Spatially, Nanquan Waterworks faced more risk by T&O contamination than Xidong Waterworks. High concentrations of NO3-N, TDN and TN could be risky signs of taste and odor events by DMS, DMTS, IPMP, IBMP and GEO. (C) 2010 Elsevier B.V. All rights reserved.
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