|
KMID : 0895419960060020292
|
|
Journal of Korean Society of Occupational and Enviromental Hygiene
1996 Volume.6 No. 2 p.292 ~ p.300
|
|
|
Pretreatment Effect on the Analysis of Insoluble Hexavalent Chromium
|
|
|
|
|
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 CrO₄^(-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% Na₂CO₃ 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.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|