• Title/Summary/Keyword: Chemical characterization

Search Result 2,951, Processing Time 0.047 seconds

Seasonal Characterization of Particles in Busan Area (부산지역 먼지입자의 계절별 특성)

  • Kang Shin-Mook;Cho Jeong-Goo
    • Journal of environmental and Sanitary engineering
    • /
    • v.20 no.3 s.57
    • /
    • pp.17-26
    • /
    • 2005

  • Many researches were focused on the data which obtained from chemical bulk analysis. It is difficult to evaluate source contribution by wet type chemical bulk analysis. In this study, we have reviewed the characterization of individual particle for source identification. We analyzed by SEM/EDX methods. We have obtained average geometric particle diameter measured by optical diameter which were resulted from SEM/EDX image scan, representative physical diameter of individual particle was $3.38\;{\mu}m\;in\;A,\;3.67\;{\mu}m\;in\;B$. In the result of image analysis at each spots particles, both samples non-sphere shapes, C-rich particles. In consequence of chemical analysis of individual particle, each sampling sites some elements.

  • PDF KSCI

Piperoctadecalindine, a New Piperidine Alkaloid from Piper retrofractum Fruits

  • Ahn Jong Woong;Lee Chong Ock;Kim Eun Joo;Zee Ok Pyo;Kim Hyung Jin
    • Bulletin of the Korean Chemical Society
    • /
    • v.13 no.4
    • /
    • pp.388-391
    • /
    • 1992

  • A chemical investigation of the fruits of Piper retrofractum (Piperaceae) has led to the isolation and characterization of a novel piperidine alkaloid, piperoctadecalidine together with three known alkaloids piperine, pipernonaline and guineensine. The structure of the new compound was detemined to be (2E,4E,14Z)-N-(2,4,14-Octadecatrienoyl) piperidine by spectral and synthetic methods.

  • https://doi.org/10.5012/bkcs.1992.13.4.388 인용 PDF