气相色谱法测定水体中多氯联苯Aroclor系列

采用液液萃取—气相色谱法(GC-ECD)测定水体中多氯联苯Aroclor系列Aroclor1016、Aroclor1221、Aroclor1232、Aroclor1242、Aroclor1248、Aroclor1254、Aroclor1260。样品经正己烷溶剂萃取,再经全自动样品浓缩仪(EVA)浓缩萃取液至1 mL,供气相色谱仪测定,外标法定量,加标回收率在75%~110%之间,检出限为0.1μg/L。该方法采用双塔双柱双检测器,排除了误检和其他物质的干扰,保证了分析结果的可靠性,方法简单、灵敏、准确。     

The Use of the Isotopic Composition of Individual Compounds for Correlating Spilled Oils and Refined Products in the Environment with Suspected Sources

Correlation of crude oils, or refined products, in the environment with suspected sources is typically undertaken through the use of GC and GCMS and in certain cases bulk carbon isotope compositions. However, with crude condensates, or refined products in particular, the absence, or low concentration, of biomarkers precludes their successful use for making unique correlations. An alternative and, sometimes, complimentary technique for correlation of such products is evolving through the use of combined gas chromatography-isotope ratio mass spectrometry (GCIRMS). This approach permits determination of the carbon and hydrogen isotopic composition of individual compounds in the crude oil or refined product to produce isotopic fingerprints for use in correlation studies. In this paper, it is proposed to review applications of GCIRMS to the correlation of various spilled products with their suspected sources in different environments. Whilst not proposing that this technique will replace GC or GCMS; it is proposed that GCIRMS is a very powerful tool to be used in conjunction with GC and GCMS to make such correlations. Although isotopic fractionation has been observed in some of the lighter components such as benzene and toluene, higher carbon numbered compounds, say above C 10 , do not appear to undergo any significant isotopic fractionation as a result of weathering. Furthermore with refined products, isotopic fractionation of the lighter components has the potential to demonstrate the onset of natural attenuation of refined products in the environment.     

毛细管气相色谱法测定空气中三种醛类污染物

报道了以酸性２,４－二硝基苯肼为吸收液采集空气中的甲醛、乙醛和丙烯醛,以气相色谱法分析形成的腙衍生物。方法的回收率在９５％ 以上,最低检测限为０．３５～８．４ｎｇ,线性工作范围为２．１～５０９ｎｇ,可测定空气和废气中的醛类污染物。     

工业废气中丙烯酸甲酯气相色谱法测定法

建立了用气相色谱法测定工业废气中丙烯酸甲酯的方法。废气中丙烯酸甲酯活性炭吸附,二硫化碳解吸,氢火焰离子化检测器检测,时间定性,峰面积定量。本方法前处理简便,分析灵敏度高,有机试剂使用量少,满足环境分析要求。     

废气和环境空气中糠醛监测分析方法的研究

糠醛在常温下经 2 ,4-二硝基苯肼的酸性饱和溶液吸收后 ,衍生形成糠醛腙 ,经二硫化碳萃取后 ,通过 SE-3 0色谱柱分离 ,以氢火焰离子化检测器检测。实验证明方法准确可靠 ,适用于废气和环境空气中糠醛的监测     

高压液相色谱(HPLC)测定油气田污染源中的多环芳烃

给出了高压液相色谱测定油气田污染源中多环芳烃方法的线性范围、检测下限、精密度、准确度、定性分析方法及实际样品的测定结果。     

静态顶空气相色谱法对土壤中乙醛等物质分析及研究

研究用静态顶空技术处理土壤,从而建立了静态顶空-气相色谱(GC-FID)测定土壤中的乙醛、丙烯醛、丙烯腈和吡啶的检测分析方法。在一定的静态顶空和气相色谱条件下,进行了顶空的时间和温度优化,确定了静态顶空气相色谱法测定土壤中乙醛、丙烯醛、丙烯腈和吡啶方法的检出限,并取得了满意的分离效果、线性回归方程、精密度和准确度。结果表明:用顶空气相色谱法处理土壤样品,可以减少土壤中待测有机物的损失,提高实验分析的灵敏度和准确度。     

自动顶空-气相色谱法测定水中甲醇的方法优化

从顶空进样器载气压力、顶空瓶压力、顶空瓶温度等方面对自动顶空-气相色谱法测定水中甲醇的方法进行了优化。该方法的灵敏度高于直接进样(水溶液)法、已有的顶空进样法,满足《空气和废气监测分析方法》(第4版)中吸收液中甲醇检出限0.4 mg/L的要求。     

高效液相色谱串联质谱法分析土壤中多溴联苯醚类化合物

建立了一种超高效液相色谱串联质谱法(UPLC-MS/MS)同时测定土壤中8种多溴联苯醚化合物(PBDEs)的方法,采用快速溶剂萃取(ASE)和凝胶净化色谱(GPC),经BEH反相C₁₈色谱柱分离,10 min内完成分离,使用含0.1%氨水的甲醇和水进行梯度洗脱,采用液相色谱-负离子-大气压化学电离(APCI)串联质谱,多反应监测模式(MRM),加入 ¹³C₁₂-BDE-139和¹³C₁₂-BDE-209内标作定量分析。结果表明:在优化的分析条件下,PBDEs的线性相关系数为0.998 8～0.999 5,方法检出限为0.22～0.59 μg/kg,在2个添加水平下,平均回收率为71%～126%,标准偏差为3%～18%,土壤实际质控样测定结果均在允许范围内。适合于土壤中PBDEs的快速分析,特别对于高溴代PBDEs,相比气相色谱质谱方法具有更快的分析速度和更好的稳定性。     

单柱离子色谱法同时测定地面水中阴离子

单柱离子色谱法同时测定地面水中Ｆ－、Ｃｌ－、ＮＯ－２－Ｎ、ＮＯ－３－Ｎ、ＳＯ２－４阴离子。以２．５ｍＭ苯二甲酸、２．４ｍＭ三羟甲胺缓冲液为淋洗液,在ｐＨ＝４．０,流速为１．５ｍｌ／ｍｉｎ的条件下,测得各阴离子检出限、线性回归方程及相关系数、方法的精密度和准确度。