nstantaneous and historical temperature effects on a-pinene
Analysis of water quality
factors influencing the speciation
of inorganic nitrogen using
GRA
Author Details
JieZhang
School of Life
Science,
Sichuan University, Chengdu-610 065, China
Da-PingLi
(Corresponding
author)
hengduInstitute of Biology,
ChineseAcademy
of Sciences, Chengdu-610 041, China
e-mail: lidp_cib@yahoo.com.cn
PingGao
School of Life
Science,
Sichuan University, Chengdu-610065, China
YongTao
Chengdu Institute of Biology, ChineseAcademy
of Sciences, Chengdu-610 041, China
Xiao-MeiWang
Chengdu Institute of Biology, ChineseAcademy
of Sciences, Chengdu-610 041, China
Xiao-Hong
He
Chengdu Institute of Biology, ChineseAcademy
of Sciences, Chengdu-610 041, China
Publication Data
Paper received:
16
July 2009
Revised
received:
18
May 2010
Re-revised
reveived:
11
November 2010
Accepted:
20 December 2010
Abstract
Based on the water quality data from 2006 to 2008, grey relational
analysis (GRA) is used to analyze factors that may have influence on the
speciation of inorganic nitrogen in the Chengdu section of middle Min
river. The results show that water temperature, changing from 20.2?2.7,
13.4?5.7 and 16.8?5.6oC, is
the first restrictive factor for the speciation of inorganic nitrogen; it is
negatively correlated with the ratio of total ammonia nitrogen to total
inorganic nitrogen contents [m(AN)/m(TIN)]
in three different periods of wet season, dry season and year-round. The
average pH values for years, in wet and dry periods are 7.6?0.4, 7.3?0.3 and
7.8?0.2, respectively, and have different influences in different seasons. It
is the second restrictive factor and positive correlation between pH and m(AN)/m(TIN) in wet season and through the
year yet it is the fourth factor in dry seasons. The values of dissolved
oxygen (DO), which are 4.6?1.4, 4.6?2.4, 4.6?2.0 respectively, is the third
factor and negatively correlates with m(AN)/m(TIN)
in third different periods. The chemical oxygen demand (COD) indirectly
inhibits the nitrifying bacteria because the DO is depleted in the
decomposition of organic matter by heterotrophic bacteria, showing the
positive correlation. As the alkalinity can meet the requirement of
nitrification in wet season and through the year, it is not restrictive
factor. However, it is the second restrictive factor in dry season because of
low content of alkalinity inhibiting the growth of nitrifying bacteria.
Key
words
Ammonia
nitrogen (AN), Totalinorganic nitrogen (TIN), Grey
relational analysis (GRA), Min river
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