SP-2304A型气相色谱仪测定气体中注意的几个问题

在地下气体观测的定量分析中,用气相色谱仪分析测量气体组分,是比较普遍的方法之一,气体分析资料的地震前兆反映明显,并且积累了不少典型震例,在地震预报研究中发挥了很好的作用。我们在观测实践中发现,即使严格按照规范(国家地震局,1985)的要求操作,仍有不少因素对观测数据的可靠性产生较大影响。为了提高气体观测资料的质量,对分析技术进行研究是完全必要的。 对庐江台1# 井的气体观测项目,就地下水溶解气和逸出气的观测过程,以SP-2304A型气相色谱仪的工作情况为例,结合笔者十几年的观测实践,对有关问题进行初步分析讨论,供同行参考。 1…     

Polychlorinated biphenyl (PCB) concentrations and congener composition in masu salmon from Japan: A study of all 209 PCB congeners by high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS)

We collected two subspecies of masu salmon: Oncorhynchus masou masou from four localities (southern Sea of Japan northward to Hokkaido) and O. masou ishikawae from upstream from Ise Bay close to a heavy industrial area. All 209 PCB congeners were analyzed using HRGC/HRMS. PCA ordination of congener concentrations divided data into three groups: (i) ssp. masou from Hokkaido, (ii) ssp. masou from the other regions and (iii) ssp. ishikawae. The highest ∑ PCB concentration (40.39 ng/wet wt) was in ssp. ishikawae followed by ssp. masou from southern waters; however the TEQ_{dioxin-like PCBs} was highest in ssp. masou from southern water (1.96 pg-TEQ_{dioxin-like PCBs}/g wet wt.) due to the high proportion of congener #126 in its complement (#126 has the highest toxic equivalency factor among congeners). There is likely a contamination source offshore in the southern Sea of Japan and/or along the migratory route of ssp. masou.