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김명옥 ( Myeong Ock Kim ),정인영 ( In Young Chung ),이혜리 ( Hye Ri Lee ),김금희 ( Kum Hee Kim ),최성헌 ( Sung Hun Choe ),이두희 ( Doo Hee Lee ),이원석 ( Won Seok Lee ),최종우 ( Jong Woo Choi ),권오상 ( Oh Sang Kwon ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.1
This study was performed in order to establish a reasonable assigned value and target standard deviation in various matrices from proficiency test results. RPDs between manufactured PT sample concentrations and robust or normal averages were lower than 5% in almost all items except in water, drinking water, waste and soil and 5% to 9.5% in organic solvents and organo-phosphate pesticides. Robust averages and robust standard deviations from 2002 to 2012 were calculated and Coefficient of variation (CV) was used as statistical tools to find the target standard deviation in each fields. As a result, CV of all items except mercury and arsenic showed less than 10% in water and drinking water fields. CV of mercury and arsenic was less than 20%. Most items of heavy metal in waste and soil showed less than 15%. Therefore, it is determined to be reasonable that the standard deviation of future itemized goal is calculated by multiplying the coefficient of variation of the statistical processing results during 11 years. These results will contribute to providing reliable evaluation criteria and relevant information when establishing the PT evaluation guidelines according to ISO 17043 in various fields.
안양기 ( Yang Ki An ),박종환 ( Jong Hwan Park ),홍경기 ( Gyeung Ki Hong ),장희수 ( Hee Soo Jang ),최성헌 ( Sung Hun Choe ),최종우 ( Jong Woo Choi ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.4
Suspended solid (SS) is a particulate matter less than 2 mm in water and an important indicator of Environmental Water Quality. SS was traditionally analysed by weighing in laboratory. Recently, automatic continuous measurement of SS was included as a routine monitoring of Water Tele-Monitoring System (TMS) in Korea by "Law for Environmental Testing and Inspection" and by "Law for Water Quality and Aquatic Ecosystem Preservation." However, the standard material for this automated SS analysis is not well defined in the Korean official method. The research used microcrystalline cellulose which is the standard material of ISO 11923 as a reference material and used cellulose fiber medium and Inulin as comparative materials which have same molecular formula with microcrystalline cellulose. Recovery rates of microcrystalline cellulose, cellulose fiber medium, and Inulin were 100.1%, 100.5%, and 30.9%, respectively. Some part of Inulin was dissolved in distilled water, so it cannot be used for the standard material. The variation coefficients of microcrystalline cellulose, cellulose fiber, and inulin were 5.5%, 7.7%, and 6.0%, respectively. The correlations between laboratory SS and TMS results for all materials were very high (r > 0.99). It seems like that microcrystalline cellulose suggested by ISO can be the best standard material for TMS within the conditions tested in this research.
아미노산의 농도 특성을 이용한 축산폐수와 침출수의 유사도 분석
김지영 ( Jee Young Kim ),유은진 ( Eun Jin Yoo ),남용재 ( Yong Jae Nam ),이원석 ( Won Seok Lee ),최성헌 ( Sung Hun Choe ),한진석 ( Jin Seok Han ),최종우 ( Jong Woo Choi ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.4
This study was conducted to analyze the composition of amino acids to develop of a method for tracing contamination sources in groundwater which is polluted by livestock wastewater or leachate from carcass burial sites. In this study, the FALCON (Fingerprinting Analysis of Leachate Contaminants) procedure was used to find unique characteristics in the samples of livestock wastewater and carcass leachate. For the livestock wastewater samples, Lysine accounted for the largest portion (23.39%), followed by alanine (21.93%) and glycine (6.94%). As for the composition of amino acids in carcass leachate, on the other hand, valine made up the highest percentage (28.72%), followed by leucine (19.25%) and isoleucine (15.40%), To identify distinct characteristics between livestock wastewater and carcass leachate in terms of their amino acid composition, individual data sets were estimated for the statistical reproducibility/comparability of fingerprint patterns, and consequently six amino acids such as valine, isoleucine, leucine, lysine, methionine and tryptophan were selected to develop the indicators. To statistically estimate the suitability of these six amino acids, the hierarchical clustering method was used. As a result, all samples except one livestock wastewater sample were clearly divided into two groups: livestock wastewater and carcass leachate. The similarity was 0.665 among the seven samples of livestock wastewater and 0.500 among the seven samples of carcass leachate, which shows that there are similar distribution patterns of amino acids among the samples of each group. On the other hand, the similarity between the two groups turned out to be 0.121, which indicates that livestock wastewater and carcass leachate have significantly different characteristics from each other in terms of amino acid concentration. Therefore, this method of analyzing the composition of amino acids may be useful to trace contamination sources at monitoring locations with pollution fingerprints.
김종민 ( Jong Min Kim ),신기식 ( Ki Sik Shin ),유순주 ( Soon Ju Yu ),김명옥 ( Myeong Ock Kim ),최성헌 ( Sung Hun Choe ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.6
Proficiency testing by interlaboratory comparisons is used to determine the performance of individual laboratories. In order to verify the quality of acute toxicity testing with Daphnia magna, National Institute of Environmental Research in South Korea is regularly organizing interlaboratory comparisons to estimate the analytical accuracy of different laboratories . Total 58 laboratories located in South Korea took part in interlaboratory proficiency testing scheme with three proficiency testing samples. TU(Toxic Unit) values of each laboratory were determined and robust z-score was calculated in order to evaluate the proficiency levels. Based on the robust z-score classification, 74 % of the participant laboratories showed a satisfactory performance(43 laboratories). The main reason of ‘unsatisfactory’ performance seemed to be considered that the unsuitable management of test organism incubation system and the lack of experience on the identification of the test organism condition by effect of toxicity.
김지영 ( Ji Young Kim ),박재선 ( Jae Seon Park ),남용재 ( Yong Jae Nam ),유은진 ( Eun Jin Yoo ),이원석 ( Won Seok Lee ),최성헌 ( Sung Hun Choe ),한진석 ( Jin Seok Han ),최종우 ( Jong Woo Choi ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.2
Analytical conditions of amino acids in ground-water by using UFLC-MS/MS(ESI) were optimized for prompt and accurate analysis. Under the Edmen`s method, derivatization of amino acids with PITC (phenylisothiocyanate) was performed and chromatographic separation was achieved on ODS (octadodesylsulfonate)- column with 3,400 psi. Within 10 minutes (6 min for MS collection), 21 types of amino acids were simultaneously analyzed by UFLC-MS/MS (ESI) after the selection of qualitative and quantitative ions. This method was precise with percent relative standard deviation of 2.6~13.8 % on 7 replicate analysis and accurate with percent recovery of 81.6~115.3 %. Confidence interval (CI, 3.53~4.25 mg/L). coefficient of determination (r2, 0.970562 (TRP)~0.999329 (VAL)), limits of detection (0.29(PRO)~1.88(ASN) mg/L (mean. 0.91 mg/L)), and limits of quantification (0.99(PRO)~6.28(ASN) mg/L (mean, 3.03 mg/L)) were obtained and proven to be a reliable method. Derivatives was relatively stable when it occurred for more than three hours under 45oC based on optimum tests. Also, it was notable that m/z 164.15 ion, reagent of derivatization under MS/MS, was identified with phenylalanine in the same time frame, indicating excessive quantity. However, when the quantitative ion was changed from m/z 164.15 to m/z 221.10, relevant result was achieved.