• Title/Summary/Keyword: 화학성분 분석

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A Study on the Analysis of Ingredients and Safety of Darkening Shampoo using Gas Chromatography Mass Spectrometer (GC-MS) (기체 크로마토그래피 질량 분석법을 이용한 다크닝 샴푸의 성분 분석 및 안전성에 관한 연구)

  • Yuri Kim;Woonjung, Kim
    • Industry Promotion Research
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    • v.9 no.1
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    • pp.13-20
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    • 2024
  • In this study, we conducted a compositional analysis of five darkening shampoos available in the South Korean market and evaluated their active ingredients and safety based on the analysis results. GC-MS analysis was employed to identify the main components of each shampoo, revealing discrepancies between the detected compounds and the ingredient lists provided by the manufacturers. These differences are interpreted as being due to the limitations of the GC-MS analysis and the volatility of certain compounds. Further investigations were carried out to explore compounds potentially contributing to hair darkening. However, it was not definitively concluded that these compounds are directly involved in the hair darkening process. It is speculated that they may enhance hair care product performance and offer additional benefits to hair, or improve product texture, stability, or preservation. Additionally, the GC-MS analysis identified several compounds with potential safety concerns, necessitating caution when used as cosmetic ingredients.

Non-destructive Analysis of Compost by Near Infrared Spectroscopy (근적외선 분광법을 이용한 퇴비의 비파괴 분석)

  • Nam, Jae Jak;Lee, Sang Hak
    • Journal of the Korean Chemical Society
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    • v.44 no.5
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    • pp.410-414
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    • 2000
  • The feasibility of near infrared spectroscopy (NIRS) for the evaluation of the compost pro-duced by composting swine excreta has been investigated. The analytes determined were total nitrogen, total phosphorus, organic matter,total carbon,moisture, Cu, $K_2O$ and $Na_2O$. The ranges of concentration of the cal-ibration samples obtained by the conventional chemical method for each component were 1.30-2.75%, 1.45-4.86%, 7.36-81.5%, 23.0-41.1%, 4.2 the coefficient of variation was 4.38, 5.5, 3.2, 1.5, 10.9, 10.6 and 11.9% for total nitrogen, total phosphorus, organic matter, total carbon, moisture, Cu, $K_2O$ and $Na_2O$,respectively. The overall results showed that NlRS can be used for a non-destructive and rapid determination of the analytes to evaluate the quality of compost samples.

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The Changes of Chemical Composition of Green Tea by Picking Periods (채취시기에 따른 녹차의 성분 변화)

  • Yang, Jae-Kyung;Kim, Jong-Cheol;Lee, Jong-Gug;Jo, Jong-Soo
    • Journal of agriculture & life science
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    • v.46 no.2
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    • pp.49-61
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    • 2012
  • This study was carried out to investigate the chemical composition and the inorganic constituents of the green tea at the 3 picking periods (Ujeon, Sejag, Jungjag) in Hadong. The results as follows ; The contents of chlorophyll, tannin, vitamin-c and total catechin were increased as picking periods increased but the contents of total nitrogen, total free amino acids, theanine and caffeine were decreased on the reverse. The inorganic constituents Mg, Ca and Mn were increased as picking periods getting late but the Na, K, B contents were decreased on the reverse. The contents of the total nitrogen, chlorophyll, total free amino acid, theanine, caffeine and total catechin and Na, Mg, Ca, B and Se were insignificant differences between Ujeon and Sejag.

울산 석유화학공단 지역내 불포화대 토양층의 구간별 중금속성분 분포 연구

  • Yu Hun-Seon;Jeong Sang-Yong;Gang Dong-Hwan;Kim Cheol;Mun Jong-Ik
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2005.04a
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    • pp.186-190
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    • 2005
  • 본 연구는 울산 석유화학공단 지역을 중심으로 여천공단과 용연공단의 불포화 토양층에서 지표면하 1.0m 지점까지 3구간 $(GL-0{\sim}0.2m,\;0.2{\sim}0.5m,\;0.5{\sim}1.0m)$으로 나누어 토양을 채취하여 토양환경보전법에서 규제하는 중금속 성분을 실내분석 하였다. 연구지역의 토양내 pH는 모든 구간에서 평균 $6.9{\sim}7.0$으로 나타났으며, 대체적으로 $7.5{\sim}8.5$ 사이의 약알칼리성을 가지며 공장이 밀집한 지역에서는 pH $4.1{\sim}4.5$ 정도의 강한 산성을 나타내었다. 연구지역의 토양내 중금속은 Cd, CU, Pb, As, Hg, Ni, $Cr^{+6}$ 및 Zn 성분이 분석되었다. Zn와 $Cr^{+6}$ 성분을 제외하고는 시료채취 구간별 함량의 차이는 거의 나타나지 않았다. $Cr^{+6}$과 Zn 성분은 $0{\sim}0.2m$ 구간에서 높은 함량을 나타내었다.

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A Study on Identification of Source Using SEM-EDX by Analysis of shape and chemical composition in individual Particles (SEM-EDX법을 이용한 개별입자의 형상과 화학적 조성 분석을 통한 발생원 추정에 관한 연구)

  • 염해진;전보경;최금찬
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2003.05b
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    • pp.320-321
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    • 2003
  • 대기중에 존재하는 입자상물질은 광범위한 입경역에 걸쳐서 다종다양한 미량화학성분으로 구성되는 분산체이고, 그 성상은 공간적으로도 시간적으로도 크게 변동한다. 입자상 물질의 화학분석법은 발생원 동정을 위한 자료로 적합하며 일반적으로는 습식의 파괴적인 원소분석으로 하는 경우가 많다. 일반적으로 화학적 분석법은 개별입자의 정보가 무시되며 필터에 포집된 bulk 시료에 의한 분석이 진행되므로 장시간 포집에 의한 단시간의 시간변동과 개개의 입자가 가지는 정보가 무시되고 평균화 되어버린다. (중략)

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The Study of Effect of EDTA(Ethylenediaminetetraacetic acid) to the defected Ni-Cr-Fe Alloy in the Steam Generator Chemical Cleaning of the Nuclear Power Plant (원전 SG 화학세정 환경에서 EDTA가 결함 Ni-Cr-Fe 합금에 미치는 영향 연구)

  • Gwon, Hyeok-Cheol;Lee, Han-Cheol;Seong, Gi-Bang
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2013.05a
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    • pp.117-118
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    • 2013
  • 증기발생기 화학세정 모사 장치를 이용하여 고농도 화학세정(EPRI/SGOG) 용액인 EDTA(20%)가 인위적으로 제작한 결합 시편에 미치는 영향 평가를 수행하였다. 평가 방법은 세정 전 후 표면 산화막 성분, ECT 분석값 비교, 증기발생기 구성 재료 부식률를 이용하였다. 화학세정 전후 부식률은 A508은 $8.023{\mu}m$, Alloy 600(HTMA)은 $0.007{\mu}m$이며 갈바닉 시편의 경우 $63.193{\mu}m$로 모두 부식 허용치 이내이다. 표면 산화막 성분 및 ECT 분석값 역시 변함이 없었다. 이와 같은 결과로 화학세정 용액인 EDTA는 결함 튜브에 미치는 영향이 없는 것으로 판단된다.

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e-Team-인터넷침해사고대응지원센터 분석대응팀

  • Korea Information Security Agency
    • 정보보호뉴스
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    • s.128
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    • pp.24-25
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    • 2008
  • 기자의 학창시절 중 가장 큰 고통(?)을 안겨 준 수업 시간은 화학시간이었다. 눈에는 보이지 않는, 하지만 여러 개의 분자와 원자로 구성된 성분을 어떻게 구분해야할지, 또 눈에 보이지 않는 성분이 도무지 이해되지 않았던 탓이었다. 악성코드나 웜.바이러스를 대하는 일반인들의 심정도 그러하지 않았을까. 같아 보이지만 서로 다른 악성코드와 웜.바이러스. 분석대응팀은 그 미세한 차이를 구별하고 분석하는 일을 한다.

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Analysis of Trace Impurities in The Bulk $H_2$ and He Gases by a Cold Concentration Method (저온 농축법에 의한 수소와 헬륨 중의 미량가스 분석)

  • Lee, Taeck Hong;Park, Doo Seon;Son, Moo Ryong
    • Journal of the Korean Chemical Society
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    • v.42 no.5
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    • pp.526-530
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    • 1998
  • Analysis of trace impurities in the gases has been very important with the development of semi-conductor related industry. Particularly, the contamination of the gas handling systems in a semi-conductor plant by the air has been a trouble to the manufacturers. Thus, the analysis of the air components in the system has been a task to the analysts. In this study, we report the analysis data with a expanded uncertainty for the trace impurities of nitrogen and argon in the bulk helium and hydrogen. All data show a good correspondence, exhibiting reliable statistical error ranges.

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The Simultaneous Determination of Chemical Ingredients in Silica Minerals by X-ray Fluorescence Spectrometry using Matrix Correction Method (매트릭스 보정법을 이용한 규산질 광물 중 화학성분의 X-선 형광분광법 분석)

  • Kim, Yeong Man;Choe, Beom Seok;Lee, Gyeong Mi;Kim, Seon Tae;Lee, Jong Uk
    • Journal of the Korean Chemical Society
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    • v.34 no.1
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    • pp.63-68
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    • 1990
  • The chemical ingredients such as $SiO_2,\;Al_2O_3,\;MgO,\;Fe_2O_3,\;CaO$ and $TiO_2$in silica minerals were determined by X-ray fluorescence spectrometry using a matrix correction method. The synthesized standards mixed with reagent grade oxides and the sample were diluted by fusing with 16 times $Li_2B_4O_7$. The matrix effects correlated among the ingredients were corrected by the empirical coefficient method based on the Lucas-Tooth and Pyne model. The analytical results showed relatively good agreement between the different sets of coefficients but were improved with increasing the number of standard. The accuracy of this method was also examined with the standard reference material of NIST.

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