Chlorophyll-a and its degradation products (pheopigment) contained in the sediment were determined to evaluate the eutrophication status in the downstream of Nakdong River. The chlorophyll-a and pheopigment concentrations of sediment ranged 11-646 mg μ

용액중(溶液中) propanil 분해산물(分解産物)의 분리(分離) 및 동정(同定)을 위해서 2000ppm으로 처리(處理)한 후 2주(週) 간격(間隔)으로 12주(週)까지 일정(一定)한 온도(溫度)로 유지(維持)시키면서 주분해산물(主分解産物)을 조사(調査)한 결과(結果)는 다음과 같다. 추출(抽出)한 혼합물(混合物)로부터 benzene을 전개용매(展開溶媒)로 한 TLC에서 분해산물(分解産物)인 DCA와 TCAB를 Rf치(値) 0.65와 0.94에서 분리(分離)할 수 있었다. GC분석(分析)은 column 온도(溫度) 에서 분리(分離)가 가능(可能)하지만 정량적(定量的) 분석(分析)에서 DCA는 , TCAB는 로 달리하여 분해경로(分解經路)를 조사(調査)하였다. IR spectrum에서 와 의 흡수(吸收) band에 의(依)해 DCA의 작용기(作用基)가 결정(決定)되었다. NMR spectrum에서 와 의 peak는 DCA의proton과 일치(一致)하였다. 이와 같이 용액중(溶液中) 혼합추출물(混合抽出物)로부터propanil의 주분해산물(主分解産物)을 TLC로 분리(分離)하여 GC, IR, NMR로 동정(同定)한결과 propanil은 용액(溶液) 내(內)에서 DCA를 거쳐서 TCAB로 분해(分解)되는 것으로 나타났다.

Suspended and sinking particles were collected in austral summer during ODP Leg 119 to the Indian Ocean sector of the Antarctic Ocean. Field work was carried out at four sampling sites in Prydz Bay. Two of these sites were located in the Outer Bay, and two in the Inner Bay. At the four locations, a total of ten deployments of a sediment trap array were made. The concentrations of chlorophylls and their degradation products both in suspended and sinking particulate matter in Prydz Bay were analyzed using HPLC. Chlorophylls a and c were the dominant algal pigments both in suspended and sinking particles. Because of the abundance of fecal pellets at Site 740, the mean fluxes at 200 m averaged 6 fold greater than that at 50 m. This implies that a dense swarm of zooplankters, presumably large copepods and/or salps, may "feed and excrete" mainly in between 100-200 m depths at this site, closest to land in Prydz Bay. Interestingly, The flux of phaeophorbide a was generally similar in magnitude to that of chlorophyll a throughout the study areas. This is an evidence that materials escaping from near-surface regions in austral summer derive mainly from the gazing of zooplankters. "New production" from sediment-trapped CHL pigment fluxes in Prydz Bay was estimated using f-ratio of 0.15, ranging from 520 to 1,605 μgC m-2 day-1.

Photosynthetic pigments and their degradation products in suspended and sinking particles collected from the Gulf of Mexico waters 1987∼88, were measured using High Performance Liquid Chromatography (HPLC). The short term variations in flux rates of chlorophylls and carotenoids as well as their degradation products were compared at the mesoscale cyclonic and anticyclonic circulation features (cold core ring and warm core ring). Chlorophyll a was the predominant porphyrin of suspended particulate matter at both CCR and WCR. Among carotenoid pigments, 19`-hexanoyloxyfucoxanthin, which is a biomarker of prymnesiophytes, was dominant pigment at both rings. Phaeophorbide a, which is produced through the grazing processes of grazers, was the predominant degraded pigment in sinking particles at the study area. Total pigment flux in CCR was an order of magnitude higher than that in WCR. Less than 1% of the standing stock of the pigments measured sank out of the upper 200 m of the WCR on any given day. Thus, suspended particulate matter in Gulf of Mexico was not recycled rapidly.