TH-300B大气挥发性有机物快速在线监测系�?参数-价格-中国粉体罐�/title>

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$(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><strong>适用范围 </strong></p><p> 现在，城市环境空气污染成为人们越来越关心的一个话题。城市空气污染已经开始从一次污染向二次复合型污染转化，表明城市环境空气污染的严重性和复杂性。光化学烟雾是典型的二次污染物，是含有挥发性有机物（VOCs、OH自由基）和氮氧化物（NOs）的空气在太阳光紫外</p><p>线照射下发生光化学反应的产物，主要成分是臭氧和过氧乙酰硝酸酯（PAN），浓度达到50mg/m<sup>3</sup>会致人死亡。为了全面评估环境空气质量，了解城市空气污染的成因，全面监测VOCs是十分重要的、�/p><p> 挥发性有机物（VOCs）通常指在标准状况下饱和蒸汽压较高，沸点低�?50℃的有机化合物。VOCs组成复杂，按照组成元素分类有：C<sub>2</sub>～C<sub>12</sub>碳氢化合物（烷烃、烯烃、芳香烃等）、卤代烃及含氧（氮、硫）有机化合物（醛、酮、醚、酯、醇、腈、胺类等）。VOCs对大气环境和人体健康都有重要影响和危害，碳氢化合物是光化学烟雾前体物，卤代烃在平流层消耗臭氧形成臭氧空洞，在对流层是温室气体，醛酮类含氧化合物是灰霾的前体物。苯�?�?-丁二烯、卤代甲烷等VOCs是致癌物或潜在致癌物。因此，对环境空气中各类VOCs进行监测至关重要、�/p><p></p><p><span><strong>仪器特点</strong></span></p><p> 应用：臭氧前驱物监测、灰霾成因研究� 大气复合型污染监测等</p><p>目标化合物：可测102种大气挥发性有机物</p><p> 捕集方式�?150℃超低温空管冷冻捕集，双通道采样，双色谱柱分离，</p><p>双检测器检浊�/p><p> 分析方式：GC-FID/MS （气相色谱分离，FID与MS双检测器（�/p><p>测量时间：支持连续自动采样与手动分析自动采样时间间隔1小时</p><p> 双通道采样：两路样品分别在冷冻除水后进入两路捕集柱，在-150℃低温VOCs被冷冻捕集；快速加热捕集柱�?20℃，热解吸的VOCs进入色谱柱中分离并分别用氢火焰离子化检测器（FID）和质谱（MS）进行检测。一次完整的分析过程可以分为四个步骤９�/p><p>样品采集（含内标采集）、解吸、分析和加热反吹、�/p><p> 1. 样品采集：将大气样品或者标准气体分别采入预浓缩系统，样品在超低温下被冷冻在捕集柱上</p><p> 2. 解吸：被捕集的样品瞬间被加热�?00 ℃以上，样品被热解吸并随载气进入分析系统�?/p><p> 3. 分析：在这一过程中，目标化合物进入气相色谱中被分离，并分别用FID与MS检浊�/p><p> 4. 加热反吹：预浓缩系统被加热到解吸温度以上，残存在捕集柱上的干扰物被完全吹凹�/p><p></p><p><strong>技术指栆�/strong></p><p></p><p></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; 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