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KMID : 1156220080340020148
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Journal of Environmental Health Sciences
2008 Volume.34 No. 2 p.148 ~ p.152
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Simultaneous NO₂ and RSP Measurements Using Filtration Method
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Yang Won-Ho
Im Seul-Gi
Kim Moon-Hyeon
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Abstract
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Coated filters were developed to replace the glass impinger methods that use reagent solutions. The purpose of this study was to simultaneously measure nitrogen dioxide (NO₂) and respirable suspended particles (RSP) by a filtration method with a cyclone connected to a pump. A first pre-filter for RSP and second filter for NO₂, which was soaked in a TEA (Triethanolamine) solution, were loaded into a filter cassette with a pump flow rate of 1.7 l/m. After sampling, the TEA soaked filter was removed from the cassette, placed in a large test tube (10 ㎖), mixed, and allowed time to develop. The absorbance (abs) of the diazo compound of the NO₂ and N-(1-Napthylethylenediamine dihydrochloride) in the color reagent was measured at 545 ㎚ on a spectrophotometer. The collection efficiency(%) of NO₂ by each 3 filter soaked in TEA solution and used in the cyclone with a pump flow rate 1.7 l/m was 89±3% and the correlation coefficient between the true NO₂ concentration and that determined by the TEA soaked filters was 0.993(p＜0.001).
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KEYWORD
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nitrogen dioxide, respirable suspended particle, filter method
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