车载小型气体质谱仪现场地气分析应用
Application of Vehicle-Mounted Miniature Gas Mass Spectrograph in Onsite Geogas Analysis
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摘要: OmniStar小型气体质谱仪用于车载实验室,可根据野外情况采取灵活的采样方式,实现对H2、He、CH4、N2、O2、Ar、CO2以及C3H8、C4H10的现场分析。对浓度为100×10-6的H2、He、CH4、N2、O2、Ar、CO2混合标气进行100次连续测定得到的各组分的精密度(RSD)均优于1％,H2、He、Ar、CO2准确度(RD)分别为3.74、0.94、1.83、10.5;对室内空气进行连续3500次测定得到的H2、He、CO2的精密度分别为2.25％、5.55％、4.06％,N2、O2、Ar的精密度优于1％;对CH4、C2H6、C3H8、C4H10混合标准气体进行连续13次测量得到的C3H8、C4H10的精密度(RSD)优于1％,测量平均值与标准值完全吻合,能够满足野外现场分析需求。在内蒙古西乌旗及新疆金窝子地区应用该仪器,采用采样袋取气、螺旋钻及井孔原位在线测定等方式得到样品数据,并发现两区域内部分采样点的CO2、H2及He异常。Abstract: OmniStar miniature gas mass spectrograph has been used in a vehicle-mounted laboratory and realizes the on-line analysis of H2, He, CH4, N2, O2, Ar, CO2, C3H8 and C4H10 with flexible sampling modes according to the actual field condition. Statistical data from 100 consecutive analysis of a mixed standard gas for components of H2, He, N2, O2, Ar, CO2 at concentration of 100 10-6 show that the analytical precision is less than 1% RSD and the analytical accuracies (RE) of H2, He, Ar, CO2 are 3.74%, 0.94%, 1.83% and 10.5% respectively. Statistical data from 3500 consecutive analysis for the indoor air sample show that the analytical precision (RSD) of H2, He, CO2 are 2.25%, 5.55%, 4.06% respectively and analytical precision of N2, O2, Ar are less than 1% RSD. Statistical data from 13 consecutive measurements of a mixed standard gas sample for CH4, C2H6, C3H8, C4H10 shows that the analytical precision of C3H8 and C4H10 are less than 1% RSD and the average values for each analyte are in agreement with standard values. High accurate measurement results satisfy the requirements of field onsite analysis. The apparatus along with twist drilling and bag gas sampling has been used in on-line analysis of gases in geological survey regions of Xiwuqi of Inner mongolia and Jinwozi of Xinjiang and the abnormal concentration of CO2, H2 and He are found in some sampling sites.
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Keywords:
- vehicle-mounted /
- laboratory /
- miniature /
- gas /
- mass
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