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PVC 여과지에서의 환원 방지를 위해 개발된 공기중 6 가 크롬 측정방법의 현장 평가
Field Validation of a Sampling and Analytical Method Developed for Preventing Airborne Hexavalent Chromium Collected on PVC Filter from Reduction
신용철(Yong Chul Shin),백남원(Nam Won Paik)
UCI I410-ECN-0102-2009-510-003984337
* 발행 기관의 요청으로 이용이 불가한 자료입니다.

The purpose of this study was to evaluate a new sampling and analytical method for the determination of airborne hexavalent chromium, Cr(VI), in a field plating operation. The procedures of this new method (Shin & Paik`s Method) are as the following: Airborne hexavalent chromium is collected on polyvinyl chloride (PVC) filter according to the National Institute for Occupational Safety and Health (NIOSH) Method 7600, and the filter sample is placed in a screw-capped vial and soaked with 2% NaOH/3% Na_2CO_3 solution immediately after sampling. The Cr(VI) sample is analyzed by ion chromatography/visible spectrophotometry (IC/VS) according to the U.S. Environmental Protection Agency (EPA) Method 218.6. The airborne Cr(VI) concentrations measured by this method were compared with those determined by three reference methods: One (NIOSH/EPA Method) consisted of sampling airborne Cr(VI) on PVC filters and storing the sample filters in screw-capped vials according to the NIOSH method, and analyzing Cr(VI) in samples using IC/VS according to the EPA method. The second method (Impinger Method/NaHCO_3) consisted of absorbing airborne Cr(VI) into 0.02 M NaHCOa solution in midget impinger, and analyzing the Cr(VI) in samples using IC/VS. The third method was the OSHA Method ID-215. Using these four different methods, four replicates of air samples were collected at an electroplating process and analyzed simultaneously. Two-way ANOVA and paired t-test were used to test difference among values determined by the methods. There was no significant difference and a strong correlation (r^2=0.99) between Cr(VI) concentrations measured by the Shin & Paik`s Method and an impinger method (p>0.05). However, Cr(VI) concentrations determined by Shin & Paik`s Method were significantly different from those by the NIOSH/EPA Method (p<0.05) or the OSHA method (p<0.05). The Cr(VI) concentrations of Shin & Paik`s Method were significantly higher than those of the NIOSH/EPA Method or the OSHA method. This result indicated that the Shin & Paik`s Method may prevent Cr(VI) losses caused by reduction and give more reliable results of airborne Cr(VI) concentrations in work environments.

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