• Title, Summary, Keyword: 토양시료

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A Study on the Statistical Representativeness of Samples taken from Radioactive Soil (방사성 토양폐기물 시료의 통계적 대표성에 관한 연구)

  • Cho Han-Seok;Kim T.K.;Lee K.M.;Ahn S.J.;Shon J.S.
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • pp.151-157
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    • 2005
  • For the treatment of regulatory clearance of the soils, a procedure for the radionuclides and radioactivity concentration analysis is under development. A strategy for soil sampling including random sampling after homogenization and standardization was set up. Statistical representativeness is considered for not only sampling strategy but also sample size. In this study, designed sample size was designed with confidence interval and error bound of soil using the pilot samples which were taken following the sampling strategy.

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Effect of the Physicochemical Properties of Soil on the Arsenic Bioaccessibility (비소용출에 대한 토양의 물리화학적 특성 영향)

  • Yang, Jae-Kyu;Chang, Yoon-Young
    • Journal of Korean Society of Environmental Engineers
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    • v.28 no.7
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    • pp.731-737
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    • 2006
  • Four well-characterized soils collected from A- and B-horizon in the Department of Energy Oak Ridge Reservation in USA, mainly distributed with Inceptisol(Inc) and Ultisol(Ult) soils, were used in this work. The bioaccessibility of arsenic as well as oxidation phenomena of As(III) was investigated with soils spiked with As(III) and As(V) using a physiologically based extraction test(PBET) at pH 1.5 and 1:100 soil to solution ratio. Also effect of aging time on the bioaccessibility of arsenic was investigated over the 6 months. After 48 hours(fresh) contacting As(V) solution with soils, all soils rapidly and strongly sequestrated As(V), especially Ult-B. However, little sequestration was observed after 3-months. When As(III) was spiked on the same soils, a great portion of As(III) was oxidized to As(V) after 48 hrs, especially Inc-A and Ult-A soils, which is strongly related with Mn content in soils. By using As(III)-spiked soils, much reduced bioaccessibility as total arsenic was observed from Inc-B and Ult-B soils over the 6 months aging time compared to that from Inc-A and Ult-A soils. This result can be explained by the continuous sequestration of As(V), produced from oxidation of As(III), onto Inc-B and Ult-B soils having much amount of iron. The trend of As(III) sequestration over six months aging time was quite similar with that of As(V) sequestration.

An Improved Soil Core Sampler (개량(改良)된 토양(土壤) 코어 시료(試料) 채취기(採取器))

  • Hwang, Jae Hong;Son, Yowhan;Kim, Jong Sung
    • Journal of Korean Society of Forest Science
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    • v.90 no.6
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    • pp.788-791
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    • 2001
  • An improved double-cylinder hammer-driven sampling device was designed to extract undisturbed soil cores. The improvements consist of 1) separation of hammer from the driving head, 2) a split inside cylinder, and 3) a plastic sample holder. Pushing the sampler deep into the soil before hammering would result in less compression of the sample. Core samples should be taken in soils of medium moisture content. The improved soil core sampler provides sufficiently accurate volumetric soil samples with original soil layers and soil cores of 40cm in length and 5cm in diameter.

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Determination of benzo(a)pyrene in Soil, Sediment and Water by Gas Chromatography- Mass Spectrometry (기체크로마토그래피/질량분석기에 의한 토양, 저질 및 수질시료 중 benzo(a)pyrene의 분석)

  • Jeon Ree Kyung;Choi Rae Yeon;Ryu Jae-Chun
    • Environmental health and toxicology
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    • v.20 no.1
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    • pp.47-55
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    • 2005
  • 본 연구는 GC/MS를 이용하여 수질, 토양 및 저질 시료 중의 benzo(a)pyrene(BaP)을 분석하는 방법을 확립하고자 하였다. BaP은 수질 시료(100mL)에서 n-hexane으로 추출하였으며, 토양 및 저질 시료(l0g) 에서는 먼저 메탄올로 추출한 후 hexane으로 다시 추출하여 농축시켜 분석하였다. 수질 시료 중의 BaP 회수율은 94.8% 이상이었으며 토양에서의 회수율은 약 93%를 보였고 재현성은 10.49% 이하였다. 검정 곡선은 상관계수(R²)값이 수질과 토양 모두에서 0.996 이상의 좋은 직선성을 보여주었다. 토양 시료의 경우 35지역 중 6지역의 토양에서 0.5~223.5㎍/kg의 농도 범위로 BaP가 검출되었으며 수질과 저질 시료에서는 모든 지역에서 검출한계 이하로 나타났다. 이 분석방법은 환경 중에 미량으로 존재하는 BaP의 분석과 모니터링에 유용하게 사용할 수 있는 적합한 방법이라 사료된다.

Improvement of accuracy in quantitative TXRF analysis of soil sample by applying external standard method (외부표준법을 적용한 토양시료의TXRF 정량분석 정확도 개선)

  • Park, Jinkyu;Park, Ranhee;Han, Sun Ho;Lim, Sang Ho;Lee, Chi Gyu;Song, Kyuseok
    • Analytical Science and Technology
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    • v.29 no.6
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    • pp.261-268
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    • 2016
  • TXRF is a powerful technique for the soil sample analysis due to its ability to conduct quantitative analysis of powder sample without complicated pre-treatment processes. The conventional internal standard method used for this technique suffers from relatively low accuracy because of varying matrix effects of soil. In order to improve the accuracy, external standard method was applied to analyze two types of soil samples; acid-dissolutionized soil solution and detergent-suspended soil powder. Individual ICP-AES/MS grade standards were mixed, diluted and measured to create standard curves, but applying these curves for analyzing the soil solution sample did not make any improvement in comparison with the internal standard method. On the other hand, standard curves were created with using standard soil powders for the analysis of soil powder samples, and we found that this method increased the accuracy significantly relative to the internal standard method. Especially, Al, Fe, K, Ca, Ti, Ba, Mn, Sr, Rb, Cu was measured with relatively high accuracy (relative error = ${\pm}20%$).

Efficient Sample Digestion Method for Uranium Determination in Soil using Microwave Digestion for Alpha Spectrometry (마이크로파 용해장치를 활용한 토양 중 우라늄의 알파분광분석법)

  • Kim, Chang Jong;Cho, Yoon Hae;Kim, Dae Ji;Chae, Jung Seok;Yun, Ju Yong
    • Journal of Radiation Protection and Research
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    • v.37 no.4
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    • pp.213-218
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    • 2012
  • Alpha spectrometry has been typically used for determination of the uranium isotopes in soil. For a number of uranium analysis in soil samples, rapid sample digestion with limited quantities of mixed acid containing HF will give a contribution for effective management of uranium analysis. Microwave digestion system is evaluated for rapid sample digestion using reference uranium soil (IAEA-375 soil). For completion of 0.5 g of soil digestion by microwave, 3 ml of HF in a 10 ml of mixed acid is minimum requirement volume for completed soil digestion for 80 minutes. Microwave digestion is timely effective techniques for uranium measurement using alpha spectrometry compared to the other methods (open vessel digestion, closed vessel digestion) due to rapid sample digestion. In addition, it can be reduced the occurrence of hazardous substances by minimizing the amount of HF.

Determination of 4-Nitrotoluene Exposure in Water, Soil and Sediment by Gas Chromatography- Mass Spectrometry (기체크로마토그래피/질량분석기에 의한 토양, 저질 및 수질시료 중 4-Nitrotoluene의 노출평가)

  • Jeon Hee Kyung;Choi Hae Yeon;Ryu Jae-Chun
    • Environmental health and toxicology
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    • v.20 no.2
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    • pp.123-131
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    • 2005
  • 본 연구는 GC/MS를 이용하여 수질, 토양 및 저질 시료 중의 4-Nitrotoluene(4-NT)을 분석하는 방법을 확립하고자 하였다. 4-NT은 수질 시료(100mL)에서 n-hexane으로 추출하였으며, 토양 및 저질 시료(10g)에서는 먼저 메탄올로 추출한 후 hexane으로 다시 추출하여 농축시켜 분석하였다. 수질 시료 중의 4-NT의 회수율은 $99.1\%$ 이상이였으며 토양에서의 회수율(recovery)은 약 $110\%$를 보였고 재현성 (relative standard deviation)은 $11.99\%$ 이하였다. 검정곡선은 상관계수$(R^2)$값이 수질과 토양 모두에서 0.994이상의 좋은 직선성을 보여주었다. 본 연구에서 채취한 수질 43개 지역, 토양 35개 지역 및 저질 11개 지역의 모든 시료에서 4-NT은 검출한계 이하로 나타났다. 이 분석방법은 환경 중에 미량으로 존재하는 4-NT의 분석과 모니터링에 유용하게 사용할 수 있는 적합한 방법이라 사료된다.

목재 방음벽 주변 토양의 중금속에 의한 오염

  • Song Byeong-Yeol;Ryu Seung-Hye;Park Eun-Ju;Kim Hui-Ja
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.238-241
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    • 2006
  • CCA 처리 방부 목재로부터 용출되는 크롬, 구리 및 비소는 주변의 토양을 오염시키는 것으로 알려져 있다. 이 연구에서는 방부 목재를 사용하여 설치한 방음벽 주변의 토양을 채취하여 분석하였다. 방음벽은 4차선의 자동차 도로와 마을 사이에 1m 높이의 콘크리트 구조물 위에 설치되었다. 수평 및 수직 시료와 더불어 대조 토양 시료를 채취하여 목재 방음벽으로 인한 주변의 토양 오염도를 평가하였다. 방음벽 인접한 곳의 토양이 대조시료에 비해 10-13mg/kg 더 높은 것으로 나타났고, 1년 전에 채취하여 분석한 자료와 비교했을 때, 시설물 인접 토양에서 크롬과 비소의 농도가 더 낮은 것으로 보아, 구성 성분의 용출 속도는 감소하고 토양에 용출된 성분은 강우 등에 의해 주변으로 이동한 것으로 판단된다.

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A Study of Contamination of soil in playgrounds with the eggs of Toxocara canis reduced ocular toxocariasis (Toxocara canis 충란에 의한 놀이터 토양 오염에 관한 연구)

  • Kim, Sang-Moon
    • Journal of Korean Ophthalmic Optics Society
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    • v.9 no.2
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    • pp.447-453
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    • 2004
  • The prevalence of Toxocara canis eggs in the public places in the city of Gwangju were studied through examination of 800 soil and 123 fecal specimens. Toxocara canis eggs were found in 15% of soil samples. In 25% parks and 17% residential quarters, these eggs were detected with higher contamination rate than other places. The soil contamination rate of playgrounds in spring and autumn was higher than that of summer and winter, and the variation range of the rate was high in parks and residential quarters. The contamination rate of eggs in 123 samples of dogs' feces was 31%, it was higher than that of soil samples(21%).

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Analysis of Soil mycoflora in Phytophthora Infested and Non-Infested Fields (역병의 감염 여부에 따른 토양 내 진균 분포)

  • Lee, Seon-Ju;Kim, Jong-Shik;Hong, Seung-Berm
    • Korean Journal of Soil Science and Fertilizer
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    • v.33 no.2
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    • pp.121-126
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    • 2000
  • Composition of fungal communities in three microhabitats such as soil, rhizosphere and rhizoplane were studied to understand the root environment of healthy and diseased plants in Phytophthora non-infested and infested fields, respectively. Samples were collected from the tomato- and red pepper-growing greenhouses in Kyungsang-Nam Province on April, 1999. Twenty-five species were isolated from each vegetation field using the dilution plate technique. There were a greater variety of species in infested fields than non-infested and in soils than in both rhizospheres and rhizoplanes. The number of species isolated were varied amongst the different microhabitats. A Trichoderma species was isolated only from non-infested fields.

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