• Title/Summary/Keyword: 알데하이드

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The effect of relative humidity on the performance of DNPH-cartridge sampling for odorous aldehydes (악취성 Carbonyl 화합물의 카트리지 채취 분석: 습도가 채취효율에 미치는 영향)

  • Lee, Min-Hee;Kim, Ki-Hyun
    • Analytical Science and Technology
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    • v.25 no.1
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    • pp.50-59
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    • 2012

  • In this study, the effect of humidity change on DNPH cartridge sampling efficiency for carbonyl compounds (CCs) has been investigated. For this analysis, gaseous standard of 6 different CCs (formaldehyde (FA), acetaldehyde (AA), propionaldehyde (PA), butyraldehyde (BA), isovaleraldehyde (IA), and valeraldehyde (VA)) was calibrated after derivatization with three types of DNPH cartridge products. Their calibration results derived at RH values between 0 and 80% were then compared against liquid phase standards. If the results of our analysis are compared by the RH values between 20 and 80%, the effect of RH can be distinguished between light and heavy CCs. For lighter CCs (like FA and AA), there was no significant change. However, for the ones heavier than PA, there was fairly noticeable increase in relative recovery ratio in RH value between 20 and 80%. Such patterns are seen consistently from all three DNPH products tested for comparison. The results of our analysis suggest that proper correction for RH change may be needed for heavier CCs by the cartridge method.

  • https://doi.org/10.5806/AST.2012.25.1.050 인용 PDF KSCI

Method comparison for analyzing formaldehyde in marker pen ink (마킹펜 잉크 내 폼알데하이드 분석법 비교)

  • Park, Kwang Seo;Kim, Yong Shin;Choe, Eun Kyung
    • Analytical Science and Technology
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    • v.33 no.3
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    • pp.115-124
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    • 2020

  • Marker pens belong to school things that are controlled by the regulation system called safety confirmation under special act on the safety of products for children with the formaldehyde criteria of 20 mg/kg. With nine marker pens available commercially, formaldehyde in marker pen ink was analyzed by present test standard where marking on a fabric swatch with a pen and extracting the swatch in water and derivatization with Nash reagent followed by UV/Vis spectrophotometeric measurement (Nash-UV/Vis method), giving not detected results or a false positive result in case of a colored water extract. However, the contents of formaldehyde in ink of nine marker pens were determinded to range between 3.2 ~ 93.2 mg/kg with three results above the safety criteria of 20 mg/kg by HPLC/DAD measurements on DNPH derivatives of formaldehyde (DNPH-HPLC/DAD method) in ink dissolved directly in water using an ultrasonic bath. Therefore, the DNPH-HPLC/DAD method with the extraction of ultrasonic dissolving ink in water is proposed as a proper method for analyzing formaldehyde in ink. The proposed method has advantages of lower detection limit and accuracy with colored extracts as well as a simple and fast extraction. The accuracy and precision of this method was estimated to be 90.1 ~ 105.4 % and 0.6 ~ 3.3 %, respectively by spiking tests in the ranges of 20 mg/kg and 40 mg/kg using matrixes such as highlighter pen ink, board marker ink, chalk marker pen ink and painter marker ink.

  • https://doi.org/10.5806/AST.2020.33.3.115 인용 PDF KSCI HTML

The Effect of Fixing Agents and Softner on Sericin Fixation of Trimethylolmelamine (트리메틸올멜라민의 세리신 정착에 있어 정착제와 유연제의 영향)

  • Park, Geon-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.5
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    • pp.93-98
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    • 2017

  • The fixing behaviors of raw silk yarns treated with melamine and formaldehyde at a molar ratio of 1:3 for trimethylolmelamine were investigated. Sericin was fixed during the fixing process, but a part of sericin I was removed simultaneously by hot water. The weight losses by fixing and the degumming losses by degumming greatly decreased with increasing concentrations of melamine and formaldehyde. The silk yarns fixed with 0.011 M melamine and 0.033M formaldehyde were significantly degummed due to the insufficient fixation of sericin and the alkaline hydrolysis of sericin by sodium carbonate during the degumming process. On the other hand, the silk yarns fixed with 0.055M melamine and 0.165M formaldehyde were degummed slightly (the degumming losses of 3-8%) due to the strong fixation of sericin, which might result from the many cross-linkages between the sericin I molecules, which were formed by trimethylolmelamine. Those fixed with the fixing solution containing 15% owf softener showed the lowest weight and degumming losses because under the condition of 15% owf softener, the cation of the softener can effectively form ionic bonds with the negatively charged side chain of aspartic acid in sericin. In addition, van der Waals' forces may be also formed between the hydrophobic tail of the softener and the hydrophobic region of sericin, which may help inhibit the removal of sericin I.

  • https://doi.org/10.5762/KAIS.2017.18.5.93 인용 PDF KSCI