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김범철,최광순,--,-- 한국육수학회 2001 생태와 환경 Vol.34 No.1
The amount, chemical composition and optical property of extracellular dissolved organic carbon (EOC) by phytoplankton were examined using axenic cultures of Microcystis aeruginosa, Anabaena flos-aquae, and Oscillatoria agardhii. The extracellular organic matter was categorized into five fractions (hydrophobic acids; AHSs, hydrophobic neutrals; HoNs, hydrophilic acids; HiAs, hydrophilic bases; HiBs, and hydrophilic neutrals; HiNs) using three adsorbent resins (XAD-8, cation, and anion). The release pattern and chemical composition of EOC varied with algal species and their growth phases. Percentage of extracellular release increased with age in all cultures. HiAs were the dominant component of EOC in all cultures, whereas the proportion of HiAs decreased with age in all cultures. In contrast, the proportions of HiBs and HiNs increased as cultures aged. In particular, the HiN fraction increased from 0% to 44% of EOC in M. aeruginosa and from 3.0% to 28% in A. flos-aquae, respectively. The proportion of AHSs was higher in the cultures of A. flos-aquae (7.5∼16%) and O. agardhii (8.7∼16%) than M. aeruginosa (0.2∼2.5%). The proportions of AHSs increased with culture age in M. aeruginosa and O. agardhii, but decreased in A. flos-aquae. The specific UV absorbance also varied among species; 1.9 Abs ㆍ ㎝^(-1)/㎎C ㆍ L^(-1) for M. aeruginosa, 3.7 Abs ㆍ ㎝^(-1)/㎎C ㆍ L^(-1) for A. flos-aquae, and 13.0 Abs ㆍ ㎝^(-1)/㎎C ㆍ L^(-1) for O. agardhii. The results of this study indicates that DOC excreted by three blue-green algae differed with species and the growth phase.
Choi, Kwang-soon,Kim, Bom-chul,Akio Imai,Kazuo Matsushige 江原大學校 附設 環境硏究所 2002 環境硏究 Vol.19 No.-
Vertical and seasonal distributions of dissolved organic carbon (DOC) were investigated in a deep reservoir, Lake Soyang,considering the fractionation and optical properties of DOC.DOC samples from epilimnion, metalimnion, hypolimnion, and from the main inflowing tributary were fractionated into four fractions by using resin adsorbants;hydrophobic acids (same as aquatic humic substances; AHS), hydrophilic acids (HiA), hydrophilic bases(HiB), and hydrophilic neutrals (HiN). Before the mon-soon. in spring and early summer,DOC concentration was consistently low (ca. 1.5㎎/1).Heavy rains associated with the summer monsoon had substantial impact on the distributions and characteristics of DOC in the lake. The fractional composition of DOC and the specific ultraviolet absorbance (SUVA) varied with sampling dates and depth.AHS and HiA were major fractions of DOC in both Lake Soyang and the inflowing river, except in the bottom layer of the lake. In the inflowing river water HiA(50.2±4.9%) was larger component than AHS (38.7±0.8%) in pre- and post-monsoon seasons, whereas AHS (58.1±2.7%) prevailed over HiA (37.4±0.8%) dur- ing the summer monsoon. In the epilimnion of the lake. HiA (36-63%) was more abundant than AHS (34-38%) in all fractionaion samples. In the metalimnion the proportions of AHS was higher with the effect of allochthonous DOC inputs during the summer monsoon. The HiA fraction was negligible in the epilimnion and the metalim-nion, but it was sometiomes major portion at the anoxic bottom layer (up to 78%). SUVA of each fraction of DOC was in the order of[AHS>total DOC>hydrophilic fraction]in both lake water and inflowing river water.
자외선에 의한 조류기원 용존유기물의 생분해도 및 화학조성변환
최광순 ( Choe Gwang Sun ),김용환 ( Kim Yong Hwan ),김범철 ( Kim Beom Cheol ),( Akio Imai ),( Kazuo Matsushige ),( Takashi Nagai ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.3
The effect of ultraviolet (UV) radiation on the characteristics of algae-derived dissolved organic matter(COM)was examined by comparing the biodegradability and DOM fraction distribution of algal DOM before and after UV exposure. Algal DOM from two exenic cultures of Microcystis aeruginosa and Oscillatoria agardhii were irradiated for 24 h at a UV intensity of 42 W/m². A complete degradation of algal DOM during the UV exposure did not occur, remaining at constant concentrations of dissolved organic carbon(DOC). After UV exposure, however, microbial degradations were reduced by 17% in M. aeruginosa and 53% in O. agardhii, respectively, and decomposition rate also were two times lower in UV exposed algal DOM. In addition, the chemical compositions of algal DOM altered substantially after UV radiation exposure. The proportions of hydrophilic bases (HiB; protein-like DOM) decreased considerably in both algal DOM sources after UV exposure (16.8% and 20.0% of DOM, respectively), whereas those of hydrophilic acids(HiA; carboxylic acids-like DOM) increased as much as the decrease of the HiB fraction. Capillary ion electrophoresis (CE) analysis showed that several carboxylic acids increased significantly after UV exposure, further confirming an increase in HiA fractions. The results of this study clearly indicate that algal DOM can be changed in its chemical composition as well as biodegradability without complete degradation by UV radiation.