Development and Evaluation of a Badge-type Passive Sampler for the Measurement of Short-term Nitrogen Dioxide in Ambient Air

대기 중 이산화질소의 단기 측정을 위한 뱃지형 passive sampler의 개발 및 평가

  • 김선규 ((주)엔버스 부설기술연구소) ;
  • 임봉빈 ((주)엔버스 부설기술연구소) ;
  • 정의석 ((주)엔버스 부설기술연구소) ;
  • 김선태 (대전대학교 환경생명공학과)
  • Published : 2006.02.01

Abstract

The purpose of this study is to develop a badge-type passive sampler for the measurement of short-term nitrogen dioxide and to evaluate its performance. The principle of the method is a colorimetric reaction of nitrogen dioxide with sulfanilic acid, N-1-naphthylethylendiamine, and phosphoric acid. First, it has been shown that the filter paper should be rinsed with ultrapure water and ultrasound, and then dried in a vacuumed desiccator. The concentration and volume of absorption reagent (triethanolamine) were $20\%$ and 100 ${\mu}L$, respectively. The extraction time was determined as 60 min. Second, duplicate measurements (n= 116) were carried out for evaluating the precision of the passive sampler. The relative error and the correlation coefficient between duplicates are $3.4\pm 3.0\%$ and 0.994, respectively. In addition, the $95\%$ confidence interval of intraclass correlation coefficient and the estimated value are 0.992$\sim$0.996 and 0.994, respectively. Third, a paired t-test was carried out for evaluating the accuracy of the passive sampler (n=40). In the result of the test, the $95\%$ confidence interval of the difference was -1.710 ppb <$\gamma$< 0.788 ppb. Finally, the average concentration of blanks, measurement detection limit, limit of detection, and limit of quantification are $2.4\pm 0.4$ ppb, 104 ppb, 3.8 ppb, and 7.0 ppb, respectively.

Keywords

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