Pretreatment Effect on the Analysis of Insoluble Hexavalent Chromium

전처리방법에 따른 불용성 6가 크롬 분석에 관한 연구

  • Lee, Eun Jung (Institute for Occupational Health, Yonsei University College of Medicine) ;
  • Roh, Jae Hoon (Institute for Occupational Health, Yonsei University College of Medicine) ;
  • Won, Jong Uk (Institute for Occupational Health, Yonsei University College of Medicine) ;
  • Chun, Mi Ryonng (Institute for Occupational Health, Yonsei University College of Medicine) ;
  • Cho, Myung Hwa (Institute for Occupational Health, Yonsei University College of Medicine) ;
  • Kim, Chi Nyon (Institute for Occupational Health, Yonsei University College of Medicine)
  • 이은정 (연세대학교 외과대학 산업보건연구소) ;
  • 노재훈 (연세대학교 외과대학 산업보건연구소) ;
  • 원종욱 (연세대학교 외과대학 산업보건연구소) ;
  • 전미령 (연세대학교 외과대학 산업보건연구소) ;
  • 조명화 (연세대학교 외과대학 산업보건연구소) ;
  • 김치년 (연세대학교 외과대학 산업보건연구소)
  • Published : 1996.11.30

Abstract

Hexavalent chromium($Cr^{+6}$) compounds are considered to be particularly hazardous, primarily because of the associated risk of allergic reaction and cancer. The analytic method of hexavalent chromium such as the s-diphenylcarba-zide(DPC) method and all ether previously used methods are often made uncertain due to significant interferences from organic components. This report can provide a technique for the more rapid and simple determination of total hexavalent chromium. than other currently using methods. The s-diphenylcarbazide method proposed by the U.S. National Institute for Occupational Safety and Health has low recovery rate(15.67 - 48.20%) due to interference, iron chloride and nickel chloride. A microwave oven technique has high recovery rate(about 70%) of insoluble hexavalent chromium. For the difference of ionic charges of $Cr^{+3}$-ethylenediamine tetraacetic acid(EDTA) chelate and $CrO_4{^{-2}}$, we could detect them simultaneously by ion exchanged high performance liquid chromatography. The confirmation of $Cr^{+3}$ and $Cr^{+6}$ were checked by fraction collector and flameless atomic absorption spectrometer. We observed that the small amount of hexavalent chromium is converted to trivalent chromium due to enhancement of chromium reduction by $Fe^{+3}$ or $Ni^{+2}$. As a result of this study, on the analysis of insoluble hexavalent chromium with microwave oven was used for, it may be better and more precise analysis after pretreatment by 2% NaOH-3% $Na_2CO_3$ and then analysis UV-spectrophotometer. It should be done for various studies on insoluble hexavalent chromium on the basis work environmental monitoring so called welding, painting etc.

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Acknowledgement

Supported by : 산업보건연구소