固定污染源废气中挥发性有机物的测定采用固相吸附-热脱附/气相色谱-质谱法，该方法依据国家环境保护标准HJ 734—2014，适用于固定污染源废气中24种特定挥发性有机物的测定，包括丙酮、异丙醇、正己烷、乙酸乙酯、苯、六甲基二硅氧烷等，当采样体积为300 ml时，方法检出限为0.001～0.01 mg/m³，测定下限为0.004～0.04 mg/m³。‌
‌方法原理与适用范围：‌ 该方法通过填充合适吸附剂的吸附管直接采集废气中的挥发性有机物，或先用气袋采集后转移至吸附管；吸附管连接热脱附仪进行二级热脱附，脱附气体经气相色谱分离后由质谱检测器检测，定性依据保留时间、质谱图或特征离子，定量采用内标法或外标法。‌
‌仪器设备与试剂材料：‌ 关键设备包括吸附管（不锈钢材质，内径5 mm，常用组合如Tenax GR、Carbopack B等）、热脱附仪和气相色谱-质谱联用仪；试剂涵盖分析纯甲醇、内标溶液（如2000 μg/ml或2500 μg/ml）、4-溴氟苯（用于GC-MS性能检验）、气体或液体标准物质（如1000 μg/ml贮备溶液），以及吸附剂如Tenax GR、Carbopack B等。‌
‌样品采集与分析步骤：‌ 采样需遵循HJ 732—2014规范，使用串联吸附管避免穿透（后管结果超过前管10%时判定穿透），安全采样体积为穿透体积的2/3；分析时将吸附管置于热脱附仪，通过程序升温脱附，气相色谱分离后质谱检测，定性通过保留时间和质谱图匹配，定量采用内标法或外标法。‌
‌质量保证与控制：‌ 质量控制措施包括方法精密度（相对标准偏差小于20%）和准确度（加标回收率80%～120%），需定期用标准物质校准仪器，检查系统检出限，并确保吸附管穿透不超标，附录提供目标物检出限、精密度数据及吸附管选择指南。‌
 

名称：吸附管/采样管/富集管

填料：石墨化碳黑——TA——碳分子筛

规格：25cm*1/8

应用：固定污染源废气 挥发性有机物的 测定 固相吸附-热脱附/气相色

 

 

适用于：

安捷伦490在线/便携，4890,5890,6890,7820,7890,8860,8890

岛津GC-14C，GC-2010，GC-2014，GC-2030

赛默飞1310,1300,1610,1600

瓦里安3800系列

布鲁克PE580,590,680,690

磐诺A90，福立GC9790，华爱，天瑞，天美，GC7900，川仪，北分瑞利，东西电子，鲁南瑞虹，捷岛/科晓

 

 

浩瀚色谱（山东）应用技术开发有限公司，研制《固定污染源有机物吸附管应用安捷伦》预监测样品采集使用组合 3 吸附管采样,热脱附/气相色谱-质谱法分析,也可采用采样 罐采样气相色谱-质谱法分析.预监测确定各固定污染源废气中挥发性有机物的组分，吸附-脱附效率高，在安捷伦，岛津，赛默飞，PE上安装使用，取得了不错的效果。


 

The determination of volatile organic compounds in fixed pollution source exhaust gas adopts solid-phase adsorption thermal desorption/gas chromatography-mass spectrometry method. This method is suitable for the determination of 24 specific volatile organic compounds in fixed pollution source exhaust gas according to the national environmental protection standard HJ 734-2014, including acetone, isopropanol, n-hexane, ethyl acetate, benzene, hexamethyldisiloxane, etc. When the sampling volume is 300 ml, the detection limit of the method is 0.001-0.01 mg/m ³, and the lower limit of determination is 0.004-0.04 mg/m ³. ‌
Method principle and scope of application: This method directly collects volatile organic compounds from exhaust gas by filling an adsorption tube with a suitable adsorbent, or first collects them with a gas bag and then transfers them to the adsorption tube; The adsorption tube is connected to a thermal desorption instrument for secondary thermal desorption. The desorbed gas is separated by gas chromatography and detected by a mass spectrometer detector. Qualitative analysis is based on retention time, mass spectra, or characteristic ions, while quantitative analysis is performed using internal or external standard methods. ‌
Instrument equipment and reagent materials: Key equipment includes adsorption tubes (made of stainless steel with an inner diameter of 5 mm, commonly used combinations such as Tenax GR, Carbopack B, etc.), thermal desorption instruments, and gas chromatography-mass spectrometry; Reagents include analytical pure methanol, internal standard solutions (such as 2000 μ g/ml or 2500 μ g/ml), 4-bromofluorobenzene (used for GC-MS performance testing), gas or liquid standard substances (such as 1000 μ g/ml stock solution), and adsorbents such as Tenax GR, Carbopack B, etc. ‌
Name: Adsorption Tube/Sampling Tube/Enrichment Tube
Packing: Graphitized carbon black - TA - carbon molecular sieve
Specification: 25cm * 1/8
Application: Determination of volatile organic compounds in fixed pollution source exhaust gas by solid-phase adsorption thermal desorption/gas chromatography
Suitable for:
Agilent 490 online/portable, 48905890689088608890
Shimadzu GC-14C, GC-2010, GC-2014, GC-2030
Thermo Fisher Scientific 1310130016101600
Varian 3800 Series
Brooke PE580590680690
Panno A90, Fuli GC9790, Huaai, Tianrui, Tianmei, GC7900， Chuanyi, Beifen Ruili, Dongxi Electronics, Lunan Ruihong, Jiedao/Kexiao