http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유순주(Soon Ju Yu),천세억(Se Uk Cheon),윤영삼(Young Sam Yoon),황종연(Jong Yeon Hwang),한의정(Eui Jung Han),유재근(Jae Keun Ryu) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.4
Bloom-forming cyanobacteria are commonly observed in eutrophic water bodies and pose a serious water quality problem because of the potent toxins that they often produce. The most commonly reported toxins are the hepatotoxins the largest group being heptapeptides, known as microcystins. It is known that microcystins are produced within the cyanobacterial cell and become free in the water column after cell lysis. It is therefore important not only to develop a rapid method of analysis but also to provide a mean of assessing intracellunar levels of toxins in addition to those free in water. The filtered water the cell were subjected to trace enrichment using a C_(18) solid-phase extraction disk and cartridge, followed by identification and determination by photodiode-array high performance liquid chromatography. Recoveries of microcystin-RR, YR, LR in ultra pure water were found to be good when spiked with concentrations as low as 1㎍/l. The linearity and precision of the experimental procedure were assessed for these microcystins. The procedures were assessed using water and the cell sampled in Daecheong reservoir where has been observed water blooming in summer seasons.
유순주 ( Soon Ju Yu ),김창수 ( Chang Soo Kim ),하성룡 ( Sung Ryong Ha ),황종연 ( Jong Yeon Hwang ),채민희 ( Min Hee Chae ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.2
Natural organic matter(NOM) is defined as the complex matrix of organic material and abundant in natural waters. It affects the performance of unit operations for water purification. Several kinds of analytical indicators such as DOC, specific ultraviolet absorbance(SUVA), apparent molecular weight (AMW), fractionation and high performance size exclusive chromatography(HPSEC) have been used to understand characteristics and variations of NOM. This study aims to evaluate the characteristics of NOM in the Geum River system comprising with stream flows and reservoirs. It was identified that SUVA denoting the portion of humic substance in water ranged within 1.60~3.36. Using resin adsorbents, dissolved organic carbon(DOC), was fractionated into three classes: hydrophobic bases(HOB), hydrophobic acids(HOA) and hydrophilic substances(HI). HI dominates in all samples, collectively accounting for more than 62% of the DOC. HOA was the second dominated fraction and it varied considerably but accounted for about 30% of the DOC. The distribution of high molecular weight(HMW) measured by HPSEC being used to determine the molecular weight distribution of aquatic humic substances was 40.1% and 38.7% in reservoir and stream flow, respectively. The distribution of low molecular weight(LMW) in stream flow was 13.2% higher than that in reservoir. And apparent molecular weight less than 1KDa, which include the molecular weight of hydrophilic organic matter, occupied with 69.2% and 68.2% in stream flow and reservoir, respectively. While the molecular weight of 1 to 100 KDa including humic substances ranged with 18.6% and 21.6% in stream flow and reservoir, respectively. Seasonal variation of refractory dissolved organic carbon was similar to that of SUVA.