Air Determination Of Total Volatile Organic Compounds

As people increasingly attach importance to environmental protection and occupational health, indoor air pollution research environmental science has gradually become an important research workers. Since a variety of decorative materials, chemicals and more and more use of indoor volatile organic compounds (VOC) species increased, which made the state departments concerned with "total volatile organic compounds (TVOC)" as the indoor air an indicator of quality, volatile organic compounds generated by this assessment of health effects and discomfort.Total volatile organic compounds in air testing, although "civil engineering indoor environmental pollution control"(GB50325-2001) Appendix E, and "indoor air quality standard"(GB/T18883-2002) are introduced in the TVOC Principles and Methods of Analysis. However, in the understanding of the practical application of many units, we found that most of the analysis results are not satisfactory, there are many specific issues. To sum up, there are two main kinds of problems:1, quantitative analysis of the accuracy is poor, mainly reflecting the poor reproducibility in the analysis.2, the low sensitivity of the system,"indoor air quality standard"(GB/T18883-2002) for a minimum detection limit0.5μg/m3, rarely achieved in the test.In this paper, these two aspects of the study in the6890N GC, TP-2030thermal desorption instrument, HP-1column configuration, by adjusting the standard curve preparation, adjust the conditions of simulated air sampling, and optimization TVOC enrichment method, can get better accuracy and precision of the method.Experimental results with the actual sample analysis, the analysis of this condition and prove that the sample enrichment methods can be determined by the concentration of the sample data was0.61-2.39%relative standard deviation, detection limit of concentration to reach0.5ug/m3, fully meet the "indoor air quality Standard "(GB/T18883-2002), and" civil engineering indoor environmental pollution control "(GB50325-2001) Appendix E of these two national standard method accuracy and sensitivity requirements.