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TC/TN-IRMS를 이용한 수질시료 내 총 유기탄소 안정동위원소 분석법 소개
박시영 ( Si-yeong Park ),김민섭 ( Min-seob Kim ),임보라 ( Bo-ra Lim ),윤숙희 ( Suk-hee Yoon ),유은진 ( Hyen-mi Chung ),정현미 ( Jongwoo Choi ),최종우 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
The measurement of stable isotope ratios on total organic carbon (TOC) has long posed analytical problems and limited the use of this powerful tracer in biogeochemical studies in aquatic systems. Here, we provide a detailed description of a successful coupling of a custom-modified total organic carbon and nitrogen analyzer (Elementar, ISO TOC Cube) to an isotope-ratio mass spectrometer (Isoprime precision, CF-IRMS). The method is based on the wet oxidation of up to 20 mL aqueous sample in a closed reactor, produced CO<sub>2</sub> is carried over a water trap and purification column in a stream of He and introduced into the IRMS via a conventional open-split interface, enabling both quantification and δ<sup>13</sup>C analysis. Typical repeatability of δ<sup>13</sup>C analyses on TOC in this setup is in the order of 0.3‰ or better, comparable to that obtained in a more conventional elemental analyzer-IRMS setup. Typical overall system blank values for TOC analysis are in the order of 1 ㎍ C. Analytical conditions (reaction time, reagent concentrations) were optimized for samples, so that a single method can handle all types of environmental TOC samples. To evaluate a success of the method developed in this study, two international standards, IAEA-600 (δ<sup>13</sup>C = -27.7‰) and IAEA-CO-8 (δ<sup>13</sup>C = -5.7‰) were used. Measured their δ<sup>13</sup>C values were -27.7 ± 0.3‰ (n=100) for IAEA-600 and -5.7 ± 0.4‰ (n=100) for IAEA-CO-8, respectively, in excellent agreement with recommended values within the error. The method developed in this study will help researcher studying carbon cycle and tracing sources of TOC in the aquatic environment.
박진기 ( Jin-ki Park ),오시영 ( Si-young Oh ),김봉섭 ( Bong-seop Kim ),박종화 ( Jong-hwa Park ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
기후변화는 전세계의 화두이자 국제 사회의 주요 의제로 대두되고 있으며, 그로 인한 영향은 태양에너지를 비롯한 신재생에너지의 개발과 활용의 필요성을 요구하고 있다. 태양에너지는 국내외적으로 광범위한 분야에 걸쳐 이를 활용하기 위한 연구사업이 활발하게 진행되고 있으며, 이미 여러 분야에서 경제성과 장래성이 입증되고 있다. 그러나 지표면에 도달하는 태양에너지가 막대함에도 불구하고 태양에너지 활용률은 0.1%에도 미치지 못하고 있기 때문에 태양에너지 활용을 극대화시키고 그 효율을 높이기 위해서는 태양에너지의 공간분포 추정이 필요하다. 또한, 태양에너지 공간분포는 작물의 성장과 수확량, 증발산 등 수문모델 및 열환경 해석 등의 입력데이터로 필요로 하고 있다. 태양에너지는 동일한 위도와, 태양 고도 등이 일정하더라도 지형의 경사도와 경사방향에 따라 입사되는 에너지가 달라진다. 본 연구에서는 지형조건을 고려하여 일사량 지형계수를 산정하고 일사량의 공간분포를 추정하였다. 또한 우리나라 일사량 관측은 37개 관측소에서 수행하고 있어 보다 정확한 일사량 관측을 위해 80개 관측소의 일조시간을 이용하였다. 그 결과 일사량은 태양고도가 낮은 겨울에는 남향과 북향의 편차가 크게 나타나고 태양고도가 높은 여름철에는 편차가 작게 나타났다. 대기밖 일사량이 가장 높은 6월과 7월은 장마 등 여름철에 집중되는 호우로 인해 실제 관측되는 일사량은 5월의 일사량이 가장 높고 12월이 가장 낮게 나타났다. 본 연구에서 추정한 지형계수 및 일사량 분포는 우리나라와 같이 복잡한 지형을 반영한 일사량 추정에 유용하게 활용될 수 있을 것이다.
박시영,박대식,Park, Shi-Ryong,Park, Dae-sik The Korean Society for Integrative Biology 1997 Korean journal of biological sciences Vol.1 No.4
Vocal repertoires of the B1ack-tailed gull (Larus crassirostris) were studied at established reproductive colonies. The Black-tailed gull has eleven different vocal signals which can be grouped into three different call classes according to behavioral functions: contact call, alarm call (attention call), and aggressive call. The contact call or mew call is the most frequently used and functions as means of recognition among individuals, particularly between parents and youngs. Our results show that each call plays .an important role in particular social relationships in a high- density breeding colony.
LA-ICP/MS를 이용한 나무 나이테 중금속 농도 분석
박시영 ( Si-yeong Park ),김민섭 ( Min-seob Kim ),박재선 ( Jae-seon Park ),박현우 ( Hyun-woo Park ),김금희 ( Kum-hee Kim ),정현미 ( Hyen-mi Chung ),최종우 ( Jong-woo Choi ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
In order tn evaluate the precision and accuracy using LA-ICP/MS, thirty major and trace elements were analyzed with 3 USGS SRMs. And we investigated correlation between metal concentrations in five species tree-ring and ambient air heavy metal pollution history in ambient air. Total thirty major and trace elements in three USGS basalt glass reference materials, BIR-1G, BCR-2G and BHVO-2G were determined using LA-ICP/MS. Calibration was performed using NIST glass SRM 610, 612 and 614 in conjunction with internal standardization using Ca. Relative standard deviation (RSD) of determinations was below 10 % for most elements in all glasses under investigation. All the USGS SRMs showed negative correlations between RSD and concentrations for elements with logarithmic correlation coefficients ranging from -0.867 to -0.790. Furthermore, these values were similar results obtained in NIST glass SRM 610, 612, 614. In natural sample analysis, 7 heavy metals in 5 tree species (Platanus occidentalis, Salix koreensis, Chamaecyparis obtusa, Pinus densiflora, Ginkgo biloba) were determined using LA-ICP/MS, and calibration was performed using cellulose - matrix matched standards with 13C normalization. Four tree ring series showed that the Pb and Fe accumulation rates were higher between `92~`99 except for Ginkgo sp., but other elements (Cr, Mn, Cd, Zn, Sr) varied depending on species, which was caused by the physiological process of element uptake and radial mobility. Pb and Cd concentrations in tree ring of Pinus sp. have correlated with the ambient air heavy metal monitoring data which showed the correlation coefficients of 0.879 and 0.579, respectively. Pb and Cd concentrations in tree-ring of Salix sp. and Platanus sp. showed positive correlation with coefficients of 0.671 and 0.825, respectively. Therefore, our results suggested that Pb and Cd concentrations of Pinus sp. can be interpreted in terms of ambient air heavy metal pollution history.