Abstract
High volatile organic compound (VOC) concentrations following building decoration have been observed frequently and they play a significant role in residents’ health. To analysis VOC characteristic of decoration stage and after decoration, we measured the VOC of a new residential unit over the decoration period and after the completion of renovation in the real-life situation. The external windows and door were left closed for about 12hs before measurements. The Tenax TA tube was used to sample VOC at 0.2-0.5ml/min for 10-20min, then analyzed by gas chromatography/mass spectrometer (GC/MS) to identify VOC type and concentration. The total time scale was about one and a half years. The results indicated that there was an obvious concentration fluctuation during the decoration period, which total volatile organic compound (TVOC) concentrations fluctuated between 0.5-10mg/m3. By comparing the concentration after every decoration process complete, it indicated that door and doorframe, cupboard, furniture may the main VOC sources indoor. The indoor VOC concentration is rather high just after all the decoration process complete. A rapid decay of concentration level happened in the first few months and generally showed a slow decrease in the following months. Double-exponential model can be used to describe the long-term concentration decay pattern after decoration. Most of the VOC concentration decreased below Chinese national standard after decoration complete 6 months, but increased again in the following summer season. The concentration difference between each room is insignificant which means in the window close situation, if the time is longer than a certain hour, the house is well-mixed between each room.
Published Version
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