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김기동,서용찬,이선동,Kim, Kee D.,Seo, Yong Chan,Lee, Sundong 대한예방한의학회 2014 대한예방한의학회지 Vol.18 No.1
The concentration of 5 metals such as As, Cd, Co, Cr and Pb in 5 frequent using herbal medicinal prescriptions in Korea were analyzed according to the consuming area. The ready prepared 5 prescription samples were obtained from Korean regional hospitals nationwide. All the sample were well powdered and pre-treated to being a solution, and then analyzed by ICP/MS. As was detected the highest concentration of 0.55 mg/kg in Ojeoksan of Gyunggi-do, the lowest was 0.01 mg/kg of Sipjeondaebotang of Seoul C. The highest concentration of Co was found to be in Bojoongikgitang of Seoul B and the lowest was also detected in Bojoongikgitang of Seoul A. Cd concentration, Ojeoksan of Chungcheong-do, Bojoongikgitang of Seoul B and yookmijihwangtang of Chungcheong-do showed the low level of 0.1 mg/kg. In turn, the highest level of Cr was 5.59 mg/kg in Ojeoksan of Gyunggi-do B. The lowest concentration of Cr was 0.04 mg/kg in Sipjeondaebotang of Seoul C and the highest was 0.94 mg/kg in Samooltang of Gangwon-do. Finally, the lowest concentration of Pb was 0.00 mg/kg in Sipjeondaebotang of Chungcheong-do and the highest was 0.134 mg/kg in Ojeoksan of Jeju-do. As a result it seems that the same prescription can not guaranteed the safety from toxic metals since those metal concentrations are dramatically varied according to the area where the each prescribed medicine available.
LC/MS법 및 LC/UVD(EPA-631)를 이용한 수계 중 Benomyl의 분석법 평가
김기동,최원규,서용찬,박병황,최혜경,Kim, Kee D.,Choi, Won Gyu,Seo, Yong Chan,Park, Byung Hwang,Choi, Hye Kyung 대한화학회 2001 대한화학회지 Vol.45 No.1
내분비계 장애물질 중의 하나인 농약 benomyl의 환경잔류실태를 조사하기 위해 수질중의 benomyl 농도를 정량 하였다. 일반적으로 benomyl은 가수분해하여 carbendazim으로 변하며 본 분석법은 carbendazim을 정량 하는 간접법이다. 수질중의 잔여 benomyl은 가수분??후 적절한 용매로 추출하여 농축, 정제되었다. 농축된 시료의 carbendazim 농도를 LC/MS (TOF)로 분석하였으며 그 결과 방해물질에 의해 발생할 수 있는 오차를 제거할 수 있었다. 검출한계는 LC/UVD법(EPA-631)에 비하여 약 1,600배 낮았으며 spike의 회수율도 약 80~118%로 양호하였다. Benomyl, one of the known endocrine disrupting chemicals, was analyzed to understand the its fate in water. Benomyl analysis process in water sample include the following sequential steps. Hydrolysis of benomyl into carbendazim, solvent extraction, concentration, and the concentration of final carbendazim solution was determined by LC/MS (TOF). Recoveries of the spiked samples were good with the range of 80.6 to 118.6% and the MDL was 1,600 times lower than that of LC/UVD method. The use of LC/MS (TOF) successfully eliminated the positive error incurred by interferencing materials in the matrix.
김기동 ( Kee D. Kim ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.1
Some of commercially available organic and non-organic vegetables in Wonju area were collected to evaluate the safety according to the heavy metal contents. The target metals included As, Cd, Co, Cr, Ni, Pb and Se. The analysis result showed that the Pb contents in organic green onion and non-organic green onion were 0.225 and 0.104 mg/kg, respectively. These values are over the safety criteria of 0.11mg/kg. Although below the criteria, organic lettuce and non-organic young radish turned out to contain 0.051 and 0.060 mg/kg of Pb, respectively. Non-organic leak also showed 0.042 mg/kg of Cd which was not over the guideline but not low concentration either. Co contents of the vegetables were relatively low (<0.1 mg/kg) except non-organic sesame leaf; it had 0.232 mg/kg. The Cr contents of organic young radish and organic green onion were all over 0.1 mg/kg. However, the rest of the vegetables had less than 0.5 mg/kg. All the samples showed less than 0.1 mg/ kg of Ni contents. This result points out that the safety of organic vegetables may not be guaranteed in terms of the toxicity from heavy metals.
ICP,OES와 XRF를 이용한 양기석의 주원소 및 유해 중금속 분석에 의한 규격 설정
김기동 ( Kee D. Kim ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.2
Major and trace toxic elements in commercially available actinolitums were analyzed. The known chemical formula were Ca2(Mg · Fe)5(Si4O11)2(OH)2 and the major elements of Ca, Mg, Fe and Si were measured by ICP/OES and XRF simultaneously and the results were compared to evaluate the accuracy. ICP/OES provides quite low concentration data compare to the XRF data due to the solubility problem during the pre-treatment process. Trace toxic elements such as As, Cd, Pb and Hg were analyzed by ICP/OES and mercury analyzer. According to XRF data, all the collected sample was turn out to be standard materials except Ac21. Most of toxic heavy metals were almost negligible except Hg contents in Ac8, Ac18 and AcP1.