• Title/Summary/Keyword: aldehydes

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Characteristics of Atmospheric Concentrations of Volatile Organic Compounds and Aldehydes for Near a Shipyard (조선소 주변지역에서 휘발성유기화합물 및 알데히드류의 농도분포 특성)

  • Park, Jeong-Ho;Suh, Jeong-Min;Han, Seong-Jong
    • Journal of Environmental Science International
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    • v.17 no.7
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    • pp.767-774
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    • 2008

  • This study was carried out to evaluate the characteristics of atmospheric concentrations of volatile organic compounds(VOCs) and aldehydes for near a large shipyard. Most of the painting work in marine coating is performed indoor and outdoor. Most of the VOCs are emitted to the atmosphere as the paint is applied and cures. The massive scale of a ship makes it difficult to capture the emissions from outdoor painting. The VOCs are an important health and contributors to photochemical smog. The VOCs and aldehydes samples were collected using adsorbent tube and 2,4-DNPH cartridge, and were determined by an automatic thermal desorption coupled with GC/MS and HPLC-UV analysis, respectively. A total of 16 aromatic VOCs and 12 aldehydes of environmental concern were determined. At indoor coating facilities, the most abundant compound among 16 target VOCs appeared to be m,p-xylene, being followed by o-xylene. But most of the aldehydes were extremely lower concentrations. The atmospheric concentration of VOCs, m,p-xylene concentrations were the highest and the mean value were outdoor workshop 11.323 ppb, residental area 5.134 ppb, and green area 2.137 ppb, respectively. However, the most aldehydes were extremely lower concentrations such as formaldehyde, acetaldehyde and non-detection such as iso-valeraldehyde, n-valeraldehyde and o-tolualdehyde.

  • https://doi.org/10.5322/JES.2008.17.7.767 인용 PDF KSCI

Study on Improvement in Reliability of Analysis for VOCs and Aldehydes (대기 중 휘발성유기화합물질 및 알데하이드의 분석 신뢰도 향상에 관한 고찰)

  • Lee M.D.;Lee S.U.;Lim Y.J.;Kim Y.M.;Kim S.Y.;Moon K.J.;Han J.S.;Chung I.R.
    • Journal of Korean Society for Atmospheric Environment
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    • v.22 no.4
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    • pp.468-476
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    • 2006

  • Hazardous air pollutants (HAPs) have high toxicity and bioaccurnulation potentials into human body even inbsmall amount (levels of ng/$m^3$). As the levels of HAPs might be controversial, it has been become essential to establish the analysis method for correct results. In this study, various analysis methods of VOCs and Aldehydes were compared in order to select the proper methods in our condition. Sampling and analysis method of VOCs were followed to EPA TO-14a and TO-17. VOCs were collected in absorption tube and separated by thermal desorption unit then analyzed by GC/MSD. Aldehydes were sampled in DNPH-cartridge and extracted into solution then analyzed by HPLC as the same condition of EPA TO-13a. This study also shows the results of QA/QC system of selected methods. Some experiments could be improving the data assurance blank test, calibration check, repetition precision check, the determination of detection limit and reproducibility of the retention time. Precisions of VOCs and aldehydes were ranged in 2$\sim$9% and 1$\sim$4% RSD, respectively. Recovery rate of VOCs showed variable ranges from 60 to 133.5%. MDL of VOCs and aldehydes were 0.044$\sim$0.284 ppb and 0.14$\sim$1.02 ng, respectively.

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Selective Removal of HCN and Aldehydes in Mainstream Smoke by Impregnated Activated Carbon and Functionalized Silica-gel (기능성 실리카겔과 첨착 활성탄에 의한 주류연 중 시안화수소와 알데히드의 선택적 흡착)

  • Lim Heejin;Shin Chang-Ho;Yang Burm-Ho;Hong Jin-Young;Ko Dongkyun;Lee Young-Tack
    • Journal of the Korean Society of Tobacco Science
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    • v.27 no.2
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    • pp.171-177
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    • 2005

  • Coconut based activated carbon and silica-gels were impregnated with 3-aminopropyltri ethoxysilan(APS) and N-(2-aminoethyl)-3-aminopropyl triethoxysilane (AEAPS) in order to investigate the effect of the amine group and the pore size of the supports on the removal of hydrogen cyanide(HCN) and aldehydes in mainstream smoke(MS). The physicochemical properties of the supports were analyzed by using thermal gravity analyzer(TGA), $N_2$ adsorption and desorption isotherms$(BET,\;N_2)$, and SEM-EDS. According to our experimental data, there was no significant difference in the delivery amount of HCN and aldehydes of non-functionalized silica-gels having meso-pores bigger than $20\AA$. In the case of silica-gels functionalized with APS(APS silica-gel), the delivery amounts of hydrogen cyanide(HCN) and aldehydes decreased with the increase of APS concentration. Silica-gel functionalized with AEAPS(AEAPS silica-gel) showed higher removal efficiency than that of APS silica-gels. The delivery amounts of HCN and aldehydes of activated carbon impregnated with APS and AEAPS increased with the increase of the APS and AEAPS concentrations. In accordance with the specific surface area analysis results, APS and AEAPS molecules decreased the specific surface area by blocking the micro-pores of the activated carbon. The volatile organic components removal efficiency by the micro-pores was higher than that of the amine group impregnated into the activated carbon.

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