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Cho, Kyung Hwa
Water-Environmental Informatics Lab.
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Evaluation of the relationship between two different methods for enumeration fecal indicator bacteria: Colony-forming unit and most probable number

Author(s)
Cho, Kyung HwaHan, DukkiPark, YongeunLee, Seung WonCha, Sung MinKang, Joo-HyonKim, Joon Ha
Issued Date
2010-06
DOI
10.1016/S1001-0742(09)60187-X
URI
https://scholarworks.unist.ac.kr/handle/201301/18772
Fulltext
http://www.sciencedirect.com/science/article/pii/S100107420960187X
Citation
JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA, v.22, no.6, pp.846 - 850
Abstract
Most probable number (MPN) and colony-forming unit (CFU) estimates of fecal indicator bacteria (FIB) concentration are common measures of water quality in aquatic environments. Thus, FIB intensively monitored in Yeongsan Watershed in an attempt to compare two different methods and to develop a statistical model to convert from CFU to MPN estimates or vice versa. As a result, the significant difference was found in the MPN and CFU estimates. The enumerated Escherichia coli concentrations in MPN are greater than those in CFU, except for the measurement in winter. Especially in fall, E. coli concentrations in MPN are one order of magnitude greater than that in CFU. Contrarily, enterococci bacteria in MPN are lower than those in CFU. However, in general, a strongly positive relationship are found between MPN and CFU estimates. Therefore, the statistical models were developed, and showed the reasonable converting FIB concentrations from CFU estimates to MPN estimates. We expect this study will provide preliminary information towards future research on whether different analysis methods may result in different water quality standard violation frequencies for the same water sample.
Publisher
SCIENCE PRESS
ISSN
1001-0742

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