• Title/Summary/Keyword: 산분해법

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The controversial points and a remedy on evaluation of heavy metal contamination in standard method for examination of soil in Korea. (국내 토양오염 공정시험방법중 중금속 관련 오염평가의 문제점과 개선책)

  • 오창환;유연희;이평구;박성원;이영엽
    • Journal of Soil and Groundwater Environment
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    • v.6 no.1
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    • pp.63-83
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    • 2001
  • Heavy metals are extracted from stream sediments, roadside soils and sediments and soils and tailings from mining area using partial extraction, acid digestion and HF-digestion. Compared to amounts of heavy metals extracted using partial extraction, those extracted using acid digestion are higher by 2.0∼221 times in Cu, 2.4∼2806 times in Pb, 1.3∼121 times in Cd, 14. 1∼1300885 times in Fe, 1.2∼272 times in Mn, 1.3∼373 times in Zn, 2.2∼1735 times in Cr. There is no special relationship between the extracted amounts of heavy metals using partial extraction and those using acid digestion. However, it is possible that there is a certain relationship between those using acid digestion and those using HF-digestion. Although partial extraction, which extracts less amounts of heavy metals (Cd, Cu, Pb) from soil compared to acid digestion, is used in domestic standard method for examination of soil, domestic soil standard for heavy metals in non-agricultural and industrial areas is higher than soil standard in foreign countries which use acid digestion. For improvement of the domestic standard method for assessment of soil, it is suggested to lower the domestic soil standard for heavy metals or to change pretreatment method for extracting heavy metals from partial extraction to acid digestion with modifying the soil standard.

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Comparison and Application of Alkali Fusion and High Pressure Acid Digestion Methods for the Analysis of Ultra Fine Powder Ceramics (파인 세라믹의 분석을 위한 알칼리 용융법과 고압 산분해법의 비교 및 응용)

  • Im, Heung Bin;Han, Jeong Ran;Lee, Gye Ho;Lee, Gwang U;Yu, Taek A Myeong
    • Journal of the Korean Chemical Society
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    • v.38 no.6
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    • pp.411-417
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    • 1994
  • For the analysis of fine ceramics, which is one of the new materials difficult to be dissolved, the methods of sample pretreatments such as alkali fusion and high pressure acid digestion were studied using inductively coupled plasma-atomic emission spectrometer(ICP-AES). For the Al2O3 powder sample, the results from high pressure acid digestion method showed better reproducibility than those obtained by alkali fusion technique. In the case of the analysis of SiC powder using the former method, impurities of the powder in the range of ppm were determined without matrix interference by removing Si as Si-F volatilization. Japan Certified Reference Materials (JCRM022 and JCRM023) were analyzed by this method for ultra fine powder and the results showed high accuracy and good reproducibility.

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Sample Pretreatment for the Determination of Metal Impurities in Silicon Wafer (실리콘 웨이퍼 중의 금속 불순물 분석을 위한 시료 전처리)

  • Chung, H.Y.;Kim, Y. H.;Yoo, H.D.;Lee, S.H.
    • Journal of the Korean Chemical Society
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    • v.43 no.4
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    • pp.412-417
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    • 1999
  • The analytical results obtained by microwave digestion and acid digestion methods for sample pretreatment to determine metal impurities in silicon wafer by inductively coupled plasma-mass spectrometry (ICP-MS) were compared. In order to decompose the silicon wafer, a mixed solution of $HNO_3$ and HF was added to the sample and the metal elements were determined after removing the silicon matrix by evaporating silicon in the form of Si-F. The recovery percentages of Ni,Cr and Fe were found to be 95∼106% for both microwave digestion and acid digestion methods. The recovery percentage of Cu obtained by the acid digestion method was higher than that obtained by the microwave digestion method. For Zn, however, the microwave digestion method gave better result than the acid digestion method. Fe was added to a silicon wafer using a spin coater. The concentration of Fe in this sample was determined by lCP-MS, and the same results were obtained in the two pretreatment methods.

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Chemical leaching of radioactive cement and paraffin waste form generated from NPPs (원전 발생 고화체 폐기물 핵종분석을 위한 침출 조건)

  • Lee Jeong-Jin;Ahn Hong-Joo;Pyo Hyung-Yeal;;;Jee Kwang-Young
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2005.06a
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    • pp.278-283
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    • 2005
  • Cement and paraffin waste form were prepared with a acid extraction method for the analysis of radionuclides generated from nuclear power plants. The acid extraction method was carried out with $HNO_3-HCl$ acid. At first, we compared the method with the microwave acid digestion method using SRM. The solutions of decomposed SRM were then analyzed by AAS and ICP-AES. The acid extraction method had shown good results as microwave acid digestion method. This method provided recovery values greater than $80\%$ for metallic elements.

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Comparison of Fatty Acid Composition by Fat Extraction Method: Different Parts of Chicken by Cooking Method (조지방 추출 방법에 따른 지방산 조성 비교 및 조리방법을 달리한 닭고기 부위별 지방산 함량 분석)

  • Jeong, Sang Hwa;Shin, Jung Ah;Kim, In Hwan;Kim, Byung Hee;Lee, Jun Soo;Lee, Ki Teak
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.43 no.8
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    • pp.1257-1263
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    • 2014
  • Different fat extraction methods such as the Rose-Gottlieb, Folch, and hydrolytic methods were compared in terms of their fatty acid contents of milk powder. Contents of total saturated fatty acids by the Rose-Gottlieb, Folch, and hydrolytic methods were 8.578, 8.302, and 8.711 g/100 g milk powder while contents of total unsaturated fatty acids by the Rose-Gottlieb, Folch, and hydrolytic methods were 11.513, 11.143, and 11.669 g/100 g milk powder, respectively. These results suggest that the hydrolytic method has a similar fatty acid composition as the well-known Rose-Gottlieb method. In uncooked chicken, total fatty acid contents of breast, gamb, and wing were 6.302, 8.313, and 11.346 g/100 g, respectively. Among different cooking methods, frying increased content of total trans fatty acids up to 0.034 (breast), 0.112 (gamb), and 0.123 g/100 g (wing).

Determination of major and minor elements in low and medium level radioactive wastes using closed-vessel microwave acid digestion (밀폐형 극초단파 산분해법을 이용한 중${\cdot}$저준위 방사성폐기물의 성분 원소 분석)

  • Lee Jeong-Jin;Pyo Hyung-Yeal;Jeon Jong-Seon;Lee Chang-Heon;Jee Kwang-Yong;Ji Pyung-Kook
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.2 no.4
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    • pp.231-238
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    • 2004
  • The conditions are obtained for the decomposition of solid radioactive wastes, including ion exchange resin, zeolite, charcoal, and sludge from nuclear power plant. In the process of decomposing the radioactive wastes was used the microwave acid digestion method with mixed acid. The solution after acid digestion by the following method was colorless and transparent. Each solution was analyzed with ICP-AES and AAS and the recovery yield for 5 different elements added into the simulated radioactive wastes were over $94{\%}$. The elemental analysis of destructive low and medium level radioactive wastes by the proposed microwave acid digestion conditions concerning the chemical characteristics of each radioactive waste are expected to be useful basic data for development of optimal glass formulation.

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Effect on the Measurement of Trace Element by Pressure Bomb and Conventional Teflon Vial Methods in the Digestion Technique (압력용기 산분해법과 테플론 바이알에서의 산분해법이 미량원소의 함량측정에 미치는 영향)

  • Lee, Seung-Gu;Kim, Taehoon;Tanaka, Tsuyoshi;Lee, Seung Ryeol;Lee, Jong Ik
    • The Journal of the Petrological Society of Korea
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    • v.25 no.2
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    • pp.107-119
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    • 2016
  • Trace element abundances in the igneous rocks are important data for petrogenetic interpretation. Their concentrations are generally measured using ICP-MS from the dissolved solution. The acid digestion of rock powder can be performed by conventional teflon vial or pressure bomb. In this paper, we investigated a problem that happened during acid digestion experiment using conventional teflon vial or pressure bomb of BCR2 and GSP2 USGS rock standard materials. The results show that the measured concentrations of the elements like Cr, Ni, Zn, Ta, W in the BCR2 are different from the recommended values of USGS whereas those of the elements like Rb, Sr, Zr, Hf, Ta, W in the GSP2 are different from those values. Our experiment shows that defect of specific elements like Cr, Ni may happen during the sample digestion. Our results also indicate that the Cr, Ni, W, Zr, Hf, Ta concentration obtained based on an acid digestion of geological samples need to be careful in their geochemical interpretation.

Dissolution Conditions of Solid Radioactive Wastes Generated from NPP for the Analysis of Radionuclides Using a Closed-vessel Microwave Acid Digestion System (원전 발생 고체 방사성폐기물 내 핵종 분석을 위한 극초단파 산분해 장치를 이용한 용액화 조건)

  • 표형열;이정진;전종선;이창헌;지광용
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.06a
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    • pp.158-166
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    • 2004
  • The optimal conditions are obtained for the decomposition of solid radioactive wastes, including ion exchange resin, zeolite, active charcoal, and sludge from nuclear power plant. In the process of decomposing the radioactive wastes were used the microwave acid digestion method with mixed acid. The solution after acid digestion by the following method was colorless and transparent. Each solution was analyzed with ICP-AES and AAS and the recovery yield for 5 different elements added the simulated radioactive wastes were over 94%. As an effective pre-treatment, the proposed microwave acid digestion conditions concerning the chemical trait of each radioactive waste are expected to be generally applied to above-mentioned radioactive wastes from nuclear power plant hereafter.

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