吹扫捕集- GC/ M S- SIM法测定海水中挥发性有机污染物

采用吹扫捕集ＧＣ／ＭＳ－ＳＩＭ法测定水中挥发性有机物,具有定量准确、操作简便等特点,检测限可达ｎｇ／Ｌ级,适合天南地北水中低深度挥发性有机物的测定。测定实际海水样品,其浓度范围在０．４ｎｇ／Ｌ～１０００ｎｇ／Ｌ之间。     

吹扫捕集与气相色谱-质谱联用测定饮用水和地表水中挥发性有机污染物

报道了Trap I(VOCARB 4000)柱捕集水中挥发性有机污染物的性能和条件,建立了吹扫捕集和气相色谱-质谱联用测定饮用水和地表水样中25种挥发性有机污染物的分析方法.水样的加标回收率在90%～110%之间,最低检测限在0.04～0.85μg/L之间,20μg/L的挥发性有机物标准溶液经重复6次测定,其相对标准偏差基本小于5.0%.该方法已成功地运用于饮用水和地表水中挥发性有机污染物的测定,结果令人满意.     

吹扫—捕集/气相色谱法测定水中挥发性卤代烃

建立了吹扫—捕集 /气相色谱 /电子捕获检测器联用测定水中 5种挥发性卤代烃分析方法 ,且按国家水质分析标准方法 (GB/T 1 71 3 0 -1 997)所确定的三氯甲烷、四氯化碳、三氯乙烯、四氯乙烯、三溴甲烷 5种挥发性卤代烃进行实验 ,采用 Supelcoport担体层析柱对去离子水处理 ,所获得的纯水无色谱干扰峰 ,本法按国家水质分析标准方法列出的 5种挥发性卤代烃进行测定在国内尚未见报导。当纯水的进样体积为 5 .0 ml时 ,其最低检出浓度为 1× 1 0 - 2～ 6× 1 0 - 4(μg/L)之间 ;相对误差在 1 .1 %～ 2 .4%之间 ;加标回收率在 82 .5 %～ 1 0 8%之间 ;相关系数在 0 .9980～ 0 .9999之间。可快速、高灵敏度、简便、准确、精密地测定水中 5种挥发性卤代烃 ,本法适用于饮用水和地表水中挥发性卤代烃的测定     

吹脱捕集GC/FID法测定海河水中挥发性有机物

采用吹脱捕集GC/FID法对海河干流水中挥发性有机物进行定性、定量分析。共检测出 39种挥发性有机物 ,不同化合物的回收率为 84 2 %～ 143 2 % ,相对偏差为 1 5 %～ 9 6 %。当水样体积为 2 5mL时 ,方法检测限为 0 0 0 1μg/L～ 0 4μg/L。     

吹扫捕集-GC/MS法测定饮用水中致嗅物质

采用吹扫捕集-气相色谱/质谱联用法测定饮用水中6种致嗅物质,优化了吹扫捕集条件。方法线性良好,甲硫醚、二甲二硫、甲苯、异佛尔酮、癸醛、β-环柠檬醛的检出限分别为10.5μg/L、0.558μg/L、0.862μg/L、47.4μg/L、4.75μg/L、3.77μg/L,标准溶液平行测定的RSD≤10.9%,加标回收率为71.0%～125%。     

GC/MS法测定黄浦江水中挥发性有机化合物

采用吹扫捕集装置与GC／MS联用仪的全自动恒流控制,对黄浦江7个断面水样中47种挥发性有机化合物进行了分析。结果表明,被查的47种挥发性有机化合物基本都有检出,其中甲苯、异丙苯的绝对检出量最高。四氯化碳的检出值也较高,吴淞口四氯化碳的平均浓度已经远远超过GB3838—2002《地表水环境质量标准》,并且四氯化碳浓度在黄浦江流域各个断面的分布具有一定规律性。     

吹扫捕集气相色谱质谱法测定土壤中挥发性有机物

建立了吹扫捕集气相色谱质谱法同时测定土壤中卤代烃类、苯系物类、氯代苯类等二十多种挥发性有机物.使用模拟土壤和实际土壤样品优化了吹扫时间、吹扫温度等参数;采用内标法绘制了校正曲线,各目标化合物5个浓度水平的响应因子的相对标准偏差均小于20%,相关系数均大于0.999;测定了方法检出限,采用2g土壤,各目标化合物方法检出限界于0.02～1.00μg/kg;对两种总有机碳含量的实际土壤样品进行了加标回收实验,回收率范围64%～123%.     

吹扫—捕集／气相色谱法测定水中挥发性有机物

为提高样品分析效率,研究并建立了吹扫-捕集／气相色谱／氢火焰检测器联用同时测定水中1,2-二氯乙烷、苯、甲苯、氯苯、乙苯、对-二甲苯、间-二甲苯、苯乙烯、邻-二甲苯、异丙苯、1,4-二氯苯、1,2-二氯苯、硝基苯、1,3,5-三氯苯、1,2,4-三氯苯、1,2,3-三氯苯、六氯丁二烯17种挥发性有机物的分析方法。结果表明,当进样体积为25．0ml时,最低检出限为0．0034-0．1088μg/L,相对标准偏差为1．8％～6．4％,加标平均回收率为97．6％-105．8％。该方法可快速、简便、准确、高灵敏度的测定水中17种挥发性有机物,并适用于饮用水和地表水中挥发性有机物的测定。     

吹扫捕集-气相色谱联用同时测定水中致嗅挥发性有机硫化物

建立了一种利用吹扫捕集(PT)-气相色谱(GC)/火焰光度检测器(FPD)同时测定水中16种致嗅类有机硫化物的分析方法。研究并优化了捕集阱类型、吹扫温度、吹扫时间,解吸温度以及解吸时间对PT的影响。实验表明:大部分硫醚类和硫醇类化合物分别在1~100 ng/L和3~300 ng/L范围内线性良好,线性相关系数大于0.99;相对标准偏差小于9.47%(n=6);加标回收率为81.68%~115.18%。定量下限(10倍信噪比)范围从0.19 ng/L(二乙基二硫醚)到2.67 ng/L(2-甲基-1-丙硫醇)。采用此方法对北京市3条河流水样进行了检测,除1-丙基二硫醚和2-甲基-2-丙硫醇外,其他14种有机硫化物都有检出,质量浓度为1.95~1 282.35 ng/L。     

吹扫捕集-气相色谱/质谱法同时测定水中的27种挥发性有机物

水中的VOCs经吹扫富集、解吸后,用HP-VOC色谱柱分离,采用全扫描和选择离子监测模式分析,内标法定量。最佳富集条件为:吹扫流速为40 m L/min,吹扫温度为40℃,吹扫时间为15 min,解吸温度为200℃,解吸时间为2 min。该法27种VOCs在一定的质量浓度范围内与其峰面积呈线性关系,相关系数r0.995,检出限为0.02~1.18μg/L。以空白样品为基体进行加标回收试验,测得回收率为79.8%~114%,相对标准偏差为0.3%~12%。     

GC／MS法测定自来水中挥发性有机化合物

应用ＧＣ／ＭＳ联用仪对自来水中挥发性有机化合物进行了测定,实现了了吹扫－捕集装置与联用仪的连接,并由ＤＰＦＣ控制,使整个过程自动化。检测的自来水样中,主要有氯甲烷类,溴氯甲烷类和苯类等挥发性化合物。     

水质中多种挥发性有机物的同时测定

在采用双柱双检测器的基础上,对水中24种挥发性有机物进行了同时测定。当进样体积为5ml时,最低检测限为0．5俐L,线性范围及测定范围为0．5～50倒L,1μg/L和20μg/L浓度水平的加标回收率在80．0％-110％之间,变异系数为0．6％～9．2％,实验结果令人满意。     

Volatile Organic Compounds: Sampling Methods and Their Worldwide Profile in Ambient Air

The atmosphere is a particularly difficult analytical system because of the very low levels of substances to be analysed, sharp variations in pollutant levels with time and location, differences in wind, temperature and humidity. This makes the selection of an efficient sampling technique for air analysis a key step to reliable results. Generally, methods for volatile organic compounds sampling include collection of the whole air or preconcentration of samples on adsorbents. All the methods vary from each other according to the sampling technique, type of sorbent, method of extraction and identification technique. In this review paper we discuss various important aspects for sampling of volatile organic compounds by the widely used and advanced sampling methods. Characteristics of various adsorbents used for VOCs sampling are also described. Furthermore, this paper makes an effort to comprehensively review the concentration levels of volatile organic compounds along with the methodology used for analysis, in major cities of the world.     

PT-GC-MS法测定水中54种挥发性有机物

建立了同时测定水中54种挥发性有机物(VOCs)的吹扫捕集-气相色谱-质谱联用法,并对吹扫捕集条件进行了优化。优化后的方法,54种VOCs在0.50~40.00μg/L质量浓度范围内线性良好,相关系数R2均0.995 6,检出限为0.021~0.105μg/L,加标回收率为76.4%~110.8%,相对标准偏差为2.33%~15.8%。该法操作简单,消耗费用低,分析速度快,具有良好的灵敏度、回收率和重现性,能够满足生活饮用水中54种VOCs的同时测定。     

吹扫捕集-气相色谱/质谱联用法测定地表水中氯丁二烯

采用吹扫捕集-气相色谱/质谱联用法测定地表水中氯丁二烯。当进样体积为20 mL时,方法在0.100μg/L~50.0μg/L范围内线性良好,检出限为0.05μg/L,标准溶液平行测定的RSD≤3.7%,地表水样加标回收率为91.0%~101%,方法可用于地表水中卤代烃、苯系物等其他21种挥发性有机物的同时测定。     

Qualitative Study of Organic Compounds in Wastewaters of a Swine Slaughterhouse

The main purpose of this work was the preliminary qualitative study of organic compounds in wastewaters of swine slaughterhouses. The samples were collected in a local abattoir and submitted to Liquid-Liquid Extraction (LLE) and Solid-phase Extraction (SPE) with XAD-4^TM resin as stationary phase. The instrumental analysis was performed by Gas Chromatography with Mass Spectrometer Detector (GC/MSD). The compounds present in the LLE and SPE extracts were identified by the GC/MSD library (Wiley). The results pointed out that SPE and LLE can extract practically the same classes of compounds at the same amounts. LLE works well for the extraction of polar organic compounds, with acidified samples, while SPE presents a better performance for the extraction of less polar organic compounds. Aldehydes were main class of the compounds extracted by SPE and LLE and decenal was the major aldehyde identified. Fatty alcohols and carboxylic acids were also identified but in minor proportions.     

Volatile Organic Compounds in the Area of Madrid: A Chemometrical Approach

Multivariate techniques have been applied to the set of dataobtained after one year sampling of volatile organic compounds(VOCs), including volatile aldehydes in the area of Madrid inorder to evaluate the possible correspondence among groups ofanalysed compounds, as far as modelling of different emissionsources in relation to location and season. The measurements were carried out at four sites in Madrid, characteristic for urban and suburban areas. Additionally, as reference, a rural area 100 km far from the city was considered. Results of correlation analysis, factor and cluster analysis are presented.Higher correlations were found between variables related withtraffic emissions. Factor analysis results showed two mainsignificant variables related to anthropogenic and biogenicemissions respectively. In relation to cluster analysis, samples were grouped according to sampling site and seasonal variations.     

预冷浓缩系统与气相色谱——质谱法测定室内空气中挥发性有机物

针对室内空气挥发性有机物测定方法的不足,本文采用预冷浓缩系统和气相色谱,质谱联用。建立了测定室内空气中39种挥发性有机物的分析方法,该方法采用苏码罐采样,经液氮预冷冻浓缩后,用心城由检测。该方法灵敏度高,操作简便、重现性好、准确度高,适用于室内空气中挥发性有机物的测定。