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수소화물 발생-유도결합 플라즈마 원자 방출 분광법을 이용한 죽염중의 비소 종분리 분석
유병규(Byung Kyu Yu),유무상(Mu Sang Lyu),선일식(Yle Shik Sun),조기성(Ki Sung Cho) 한국식품영양과학회 2012 한국식품영양과학회지 Vol.41 No.5
이 연구에서는 비소의 종분리 분석을 위하여 수소화물발생-ICP-AES를 이용하여 무기비소의 As(Ⅲ)와 As(Ⅴ)의 신호세기에 대한 citric acid와 HCl 농도의 영향을 조사하였다. 1.5% NaBH₄의 농도에서 HCl 농도 1.0 ㏖/L, citric acid의 농도 2.0%를 사용하였을 때 As(Ⅲ)만을 선택 분리할 수 있었고, 정도관리 절차에 따라 분석방법을 수행했을 때 방법 검출한계는 0.003 ㎎/㎏, 정량한계는 0.01 ㎎/㎏으로 산출되었으며, 시료의 매질간섭을 확인하기 위한 매질첨가시료분석과 정도관리시료 분석의 회수율은 80%∼110%, 표준편차는 6.2%로 정밀도와 정확도에서도 만족할 만한 수준을 나타내었다. 이에 따라 정도관리시료로 분석한 결과값과 반복성에 의한 측정불확도를 산출하여 인증표준물질의 인증값과 불확도를 비교 통계 처리함으로써 분석방법에 대한 유의성이 없음을 확인하였다. 또한 이 연구에서 제안된 분석방법에 따라 죽염 중에 존재하는 총 무기비소 분석과 비소 종분리분석을 실시한 결과 총 무기비소의 함량은 0.05 ㎎/㎏에서 0.21 ㎎/㎏ 정도로 나타났으며, 분석방법에 따른 여러 불확도 요인들의 표준불확도를 산출하여 죽염 중에 존재하는 As의 불확도를 구한 결과, As의 함량이 0.14 ㎎/㎏에 대하여 확장불확도가 0.03 ㎎/㎏(95% 신뢰수준, k=1.96)으로 최종 결과값의 21%를 나타내었다. 위의 결과로 보아 대부분 As(Ⅴ)의 형태로 존재하며 일부 시료에 대해 As(Ⅲ)의 함량이 각각 0.02 ㎎/㎏으로 총 무기비소함량의 14.3%와 9.5%를 차지하는 것으로 나타났다. As(Ⅲ) and As(Ⅴ) were analyzed in bamboo salts by hydride generation ICP-AES. In order to quantify the total amount of As in bamboo salts, AsH₃ was producted by reacting with 6 ㏖/L hydrochloric acid and NaBH₄, which was then analyzed by hydride generation ICP-AES. As(Ⅴ) was quantified simultaneously after selectively quantifying As(Ⅲ). As(Ⅲ) was quantified by determining the total amount of As and then correcting for the amount of As(Ⅲ). To improve the reliability of the analysis we repeated the experiment several times to check the detection limit, quantification limit, and measurements of our testing methods. According to the result of our quantification analysis of As existing in bamboo salt, the range of total As content was 0.05 ㎎/㎏~0.2 ㎎/㎏ and As(Ⅴ) was over 90% of the total As.
최윤호 ( Yun Ho Choi ),김남준 ( Nam Jun Kim ),황범구 ( Beom Goo Hwang ),이재형 ( Jae Hyung Lee ),선일식 ( Yle Shik Sun ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.1
In this study we observed microscopic characteristics of asbestos at different temperatures for different periods of exposure of asbestos containing material (ACM) using X-ray diffraction (XRD) and polarizing light microscopy (PLM). We observed the destruction of chrysotile crystal structure starting at 600oC using XRD and using PLM the Chrysotile fibers were heated at 1100oC for ten minutes resulting in parallel and perpendicular refractive indexes of 1.650 and 1.658 respectively. The sign of elongation was also changed from positive to negative. The results observed in this study may be useful for the quantitative analysis of asbestos which were denatured by the exposure to fire.
환경규제대응을 위한 프탈레이트 가소제 인증표준물질(PP) 개발 연구
박정우(Park Jung-woo),정정설(Jung Jung-sul),유석(Yoo Seok),김창성(Kim Chang-seong),선일식(Sun Yle-shik),박승빈(Park Seung-bin),최창휴(Choi Chang-hyoo) 표준인증안전학회 2015 표준인증안전학회지 Vol.5 No.1
The Phthalates plasticizers (DBP, BBP and DEHP) are categorized and regluated as SVHC under EU REACH Regulation. Also European Commision was reviewing DEHP and BBP as restricted substances according to clause 6 of RoHS Directive. Responding to these international environmental restrictions, we developed PP certified reference material for determination of phthalate plasticizers such as DMP, DEP, DBP, BBP, DEHP and DnOP. The CRM is manufactured in powder forms by using PP substrate and 6 types of plasticizers in twin screw extruder and had confirmed it s homogeneity, short-term stability, and long-term stability using isotope dilution-gas chromatography/mass spectrometer (ID-GC/MS) analysis. The certified values were determined by using primary reference material (PRM) of KRISS for traceability. From now on, we will provide PP CRM to national and international companies and research institutes after certification as certified reference material and registering on COMAR (code of reference material).
김남준 ( Nam-jun Kim ),곽주현 ( Ju-hyun Kwak ),김지호 ( Ji-ho Kim ),이재형 ( Jae-hyung Lee ),황범구 ( Beom-goo Hwang ),맹은호 ( Eun-ho Maeng ),선일식 ( Yle-shik Sun ) 한국환경분석학회 2016 환경분석과 독성보건 Vol.19 No.2
In compliance with the Ministry of Environment’s Asbestos Safety Management Act (enforced on 4. 28. 2012), the building owners are required to carry out asbestos building survey. Depending on the results of the surveys, the owners of such buildings need to implement necessary measures such as repairs, sealing, or closure of the relevant areas. In this study, a test for asbestos scattering limit on asbestos head lining and scattering tests before and after applying a scattering inhibitor on a subject target were implemented. The result of the asbestos scattering limit test confirmed the possibility of asbestos scattering on both the front and back side of the interior material. Tests regarding the efficiency of the scattering inhibitor showed that in the absence of the scattering inhibitor, the detected asbestos concentration exceeded the limit prescribed as per the indoor air quality guidelines; however, with the application of two types of scattering inhibitors, the asbestos concentration in the indoor air was less than the prescribed limit. These results confirmed that the asbestos scattering inhibitor is effective in suppressing the spattering of asbestos; however, it will be necessary to have regulatory controls such as the obligatory use of scattering inhibitor after development of which can prevent all asbestos scattering inhibitor. The results of this study are expected to be utilized as base data for both the maintenance and development of various management programs aimed at an effective maintenance of asbestos building material.