A fishy odor episode in a north China reservoir： Occurrence, origin, and possible odor causing compounds

A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 acc...

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Published inJournal of environmental sciences (China) Vol. 25; no. 12; pp. 2361 - 2366
Main Authors Zhao, Yunyun, Yu, Jianwei, Su, Ming, An, Wei, Yang, Min
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.12.2013
Subjects
Animals
Bacillariophyceae
China
Chrysophyta - isolation & purification
chrysophyte
diatom
Diatoms - isolation & purification
Dinobryon
drinking water
Fishes
fishy odor
flavor
flavor profile analysis
metabolites
Odorants - analysis
odors
principal component analysis
reservoir
surveys
Water Microbiology
winter
中国北方
化合物
异味
情节
水库
起源
辛烯醛
鱼腥味
China
China, People's Rep., Inner Mongolia
China, People's Rep
fishy odor
chrysophyte
reservoir
drinking water
diatom
flavor profile analysis
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Summary:A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species (two diatom and one chrysophyte species) observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6-nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover.
Bibliography:fishy odor; chrysophyte; diatom; reservoir; drinking water; flavor profile analysis
A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species （two diatom and one chrysophyte species） observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6- nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover.
11-2629/X
http://dx.doi.org/10.1016/S1001-0742(12)60317-9
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1001-0742
1878-7320
DOI:10.1016/s1001-0742(12)60317-9