Of A New Solid Phase Microextraction (spme) And Its Applied Research In The Indoor Environment Testing

Detection of in-door air pollutants needs to be made urgently because of improvement of people living conditions and increase of ornament level. Sampling and pretreatment of indoor-air pollutants is the first key. However, Traditional methods are tedious, and have a large consumption of organic solvents that can do harm to people's health and cause the second environmental pollution. Solid-phase micro-extraction (SPME) is a new technique for sampling and pretreatment. But present commercial SPME device usually are too expensive to be afforded. According to the principles of SPME and after investigation of the properties of different materials, A SPME device was assembled with the usage of SAKURA 2H automatic pencil core (0.03mm, Japan) as the extraction probe and application to detection of indoor air pollutants was investigated.Firstly, the quantitative analysis of indoor Volatile Organic Compounds (VOCs) was done using the improved SPME device combined with GC-MS equipped with a capillary column. After optimization of the experimental conditions, The abundance of ionic apex detected in injecting sampling directly method is markedly less than that in solid phase extraction (SPE) or that in SPME measurement.Secondly, trace benzene and toluene of indoor polluted air were quantitatively analyzed using SPME - GC. The SPME method was evaluated systematically and compared with traditional methods including direct injecting sampling and SPE . The results showed that there are good analytical characteristics with standard curve correlation coefficient of 0.9993, three relative standard deviations are less than 7%, recovery more than 90%. Also, another quantitative analysis of indoor pollutant formaldehyde was done using the same technique as mentioned above. The minimum detection limits determined by the improved SPME, derived SPE, and traditional spectro-photometry are 0.01mg/L, 0.04mg/L, 0.05mg/L, respectively.As a concluding remark, the improved SPME can perform sampling, extracting, concentrating, feeding. Therefore it is a simple, effectiveadsorption and de-sorption technique which eliminates the need for solvents and complicated apparatus, despite of its low price. The application of the improved SPME on-line detection of indoor pollutants will bear economic implications.