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IC와 LC-MS를 이용한 퍼클로레이트 분석 방법 비교 및 모니터링
김화빈(Hwa Bin Kim),심원진(Won Jin Sim),김민영(Min Young Kim),오정은(Jeong Eun Oh) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.1
본 연구에서는 퍼클로레이트 분석에 주로 사용되고 있는 IC와 LC/MS를 사용해 퍼클로레이트 분석법을 정립하고 각 분석법의 장단점 및 효율을 파악해 수질 및 토양 시료에서의 퍼클로레이트를 모니터링 하고자 하였다. 각 분석기기를 사용한 최적 분석 방법을 정립한 결과 IC에서의 MDL은 1 ppb였으며 LC-MS에서의 MDL은 0.005 ppb였다. 정립된 분석방법으로 부산시 내의 지하수 및 약수터, 하수처리장과 토양 시료를 대상으로 하여 퍼클로레이트 모니터링을 실시하여 퍼클로레이트에 대한 노출정도를 평가하였다. 평균 퍼클로레이트 농도는 약수터에서는 0.013 ± 0.014 ppb, 지하수 0.031 ± 0.011 ppb로 나타났고 하수처리장 폐수에서는 0.007∼0.380 ppb의 범위로 퍼클로레이트가 검출되었다. 모든 시료에서의 퍼클로레이트 농도는 EPA 기준인 24.5 ppb 이하로 나타났다. In this study, we tried to establish analysis methods of perchlorate with ion chromatography(IC) and liquid chromatography/mass spectrometry(LC/MS) and monitored perchlorate levels in various kinds of water and soil samples. The obtained method detection limit(MDL) of IC was 1 ppb and that of LC/MS was 0.005 ppb in water sample. We monitored the ground and spring water in Busan and the average perchlorate level in ground water was 0.031 ± 0.011 ppb and that of spring water was 0.013 ± 0.014 ppb. Wastewater samples were also examined and the levels of perchlorate ranged from 0.007 to 0.380 ppb. The perchlorate levels in all water samples investigated in this study were below the EPA guideline.
한국산 유독 남조류의 독소함량을 근거로 한 조류경보제 발령기준 검토
박혜경 ( Hae Kyung Park ),김화빈 ( Hwa Bin Kim ),이재정 ( Jay J. Lee ),이재안 ( Jae An Lee ),이혜진 ( Hae Jin Lee ),박종환 ( Jong Hwan Park ),서정관 ( Jung Kwan Seo ),윤석제 ( Seok Jea Youn ),문정숙 ( Jeong Suk Moon ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.4
We investigated the ranges of total cellular microcystins content of cyanobacterial blooms collected in Korean lakes and rivers from 2005 to 2009. The amount and composition of microcystins of Korean cyanobacteria varied depending on the sampling water bodies and dominant cyanobacterial genera. Toxic cyanobacterial cell numbers equivalent to 1 μg MCYSTs/L using total cellular microcystin content of Korean cyanobacteria were in the range of 2,348 to 66,980,638 cells/mL. Only four samples among forty nine samples showed less cell numbers than current criterion of Harmful Algae Alert System, 5,000 cells/mL indicating current criterion do not reflect properly the microcystins content of Korean cyanobacteria. Anabaena and Aphanizomenon spp. showed three to six times higher cell numbers equivalent to 1 μg MCYSTs/L than Microcystis spp. To propose criteria of Harmful Algae Alert System for Korean toxic cyanobacteria, we calculated about 50% selective geometrical means of cyanobacterial cell numbers equivalent to 1 μg MCYSTs/L in order of toxic content. The proposed criteria for Microcystis, Oscillatoria, Anabaena, and Aphanizomenon spp., are 10,000, 20,000, 40,000, and 80,000 cells/mL, respectively.
갑상선 수술 전 환자의 불안 정도가 수술 후 음성에 미치는 영향 : 예비연구
이형신(Hyoung Shin Lee),이상신(Sang Shin Lee),김화빈(Hwa Bin Kim),오다솔(Dasol Oh),김지수(Ji Su Kim),전석원(Suk Won Jeon),김성원(Sung Won Kim),이강대(Kang Dae Lee) 대한두경부종양학회 2017 대한두경부 종양학회지 Vol.33 No.2
Background and Objectives: Voice change after thyroidectomy may develop without injury of recurrent laryngeal nerve. Psychogenic or emotional factors related to voice change after thyroidectomy has been rarely studied. In this study, we sought to analyze the impact of anxiety on early state of post-thyroidectomy voice change. Materials and Methods: We made a retrospective chart review of 36 patients who underwent thyroidectomy for papillary thyroid carcinoma and voice exam before surgery, 2 weeks after and 1 month after surgery. All patients included in the study answered a questionnaire for State-Trait Anxiety Inventory ; STAI-KYZ (form Korean YZ). Clinico-pathologic factors and parameters of voice analysis were reviewed to analyze correlation to the anxiety index. Results: No differences were identified between clinicopathologic factors and preoperative parameters of voice analysis between patients with higher and lower level of anxiety. Noise to harmonic ratio (NHR) was higher in those patients with higher level of anxiety, 2 weeks after surgery (p=0.043). However, none of the parameters showed any difference 1 month later. Conclusion: With limited number of patients and short period of follow up, significant impact of preoperative anxiety on postoperative voice change after thyroidectomy could not be identified in this preliminary study.