MetCon PAN在线自动分析�?参数-价格-中国粉体罐�/title>

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<p><strong><span>背景简今�/span></strong><strong></strong></p><p><span>环境中的</span><span>PAN</span><span>（过氧乙酸硝酸酐，常用俗名为过氧乙酰硝酸酯）由大气中的部分挥发性有机物＇�/span><span>VOCs</span><span>）和氮氧化物＇�/span><span>NOx</span><span>）反应生成，其形成经历与臭氧形成类似。因此，</span><span>PAN</span><span>咋�/span><span>O3</span><span>均为</span><span>VOC-NOx</span><span>光化学指示剂、�/span></p><p><span>PAN</span><span>的浓度从海洋背景点几�?/span><span>ppt</span><span>到城市污染空气中超过</span><span>10ppb</span><span>。因其催泪效应和植物毒性而为人所知。因丹�/span><span>PAN</span><span>的低温稳定性，它同时也是大气活性氮的重要的储库。因此它能够作为活性氮化合物如</span><span>NO<sub>2</sub></span><span>的迁移形态，*终影响对流层臭氧的产生、�/span></p><p><strong><span>仪器介绍</span></strong></p><p><span> 1992</span><span>年，在德国环保部的支持下，基于德国马普化学所＇�/span><span>Max-Planck Institute</span><span>）的技术和研究＋�/span><span>Metcon</span><span>公司研发亅�/span><span>PAN</span><span>气相色谱分析仪。从那时起，该套系统经历了多次升级，其中校准过程经过研究院所的深入测试。仪器也在全球许多国家稳定运行、�/span></p><p><span>自动化的</span><span>PAN</span><span>分析仪适合</span><span>19“�/span><span>机架式安装。它整合了电脑控制的全自动分析仪器和一个简单可靠的校准方法、�/span><span>PAN</span><span>的检测限小于</span><span>50ppt</span><span>。动态线性范围超迆�/span><span>10ppb</span><span>。动态校准单元是基于</span><span>NO</span><span>校准气流的光化学合成</span><span>PAN</span><span>、�/span></p><p><span> PAN</span><span>由低于室温的毛细管柱进行气相色谱分离后，由电子捕获器检测。色谱柱安装在一个由</span><span>peltier</span><span>半导体制冷片控温的紧凑的柱箱中。温度波动低亍�/span><span>1K</span><span>＇�/span><span>1</span><span>度）。周围温度范围为</span><span>20~30</span><span>ℂ�/span><span>。双层隔热系统保证系统可以在宽范围的环境温度中（</span><span>5</span><span>｝�/span><span>30</span><span>ℂ�/span><span>）正常运行。纯化和预处理后的氮气作为系统的载气和补充气。对预柱进行反吹可以防止高保留时间的物种进入分析主柱和检测器，防止污染并减少分析时间。采样、进样和色谱柱的切换是由一个气�?/span><span>10</span><span>通阀＇�/span><span>VALCO</span><span>品牌）完成的。样品采样的旁路设计能够减少采样管路的停留时间、�/span></p><p><strong><span>色谱软件</span></strong></p><p><span>为便于控制色谱系统和数据采集及整合，我们设计了新的电脑软件（基于</span><span>Windows7</span><span>系统）。软件中应用了由</span><span>Measurement Computing Inc.� USA</span><span>生产皃�/span><span>I/O</span><span>控制松�/span><span>(USB-DA</span><span>或耄�/span><span>PCMCIA/PC-Card)</span><span>。下列模块是软件的一些主要组件：</span></p><p><span>l<span>控制色谱及其持续运转，为远程操控接收控制参数、�/span></p><p><span>l<span>ECD</span><span>信号的数据获取，峰数据的自动积分、�/span></p><p><span>l<span>在离线状态下，查看原始数据，重新对峰面积进行积分、�/span></p><p><span>l<span>评价积分峰的时间序列，如</span><span>CCl<sub>4</sub></span><span>�?/span><span>PAN</span><span>、�/span></p><p><span>识别峰是自动进行的，用户首先需要在测试色谱图上确定相应峰的大致位置和峰宽。在其后自动运行的色谱中，准确的峰位置和积分将会使用*小二乘法拟合并自动优化、�/span><span>PAN</span><span>的峰面积和通过校准因子产生的浓度数据同时存储、�/span></p><p><strong><span>校准单元</span></strong></p><p><span> 校准单元能够产生持续且稳定的已知浓度皃�/span><span>PAN</span><span>气体。基于从</span><span>NO</span><span>校准气（</span><span>ppm</span><span>量级）光化学合成皃�/span><span>PAN</span><span>，再动态稀释到</span><span>0.1</span><span>｝�/span><span>30ppb</span><span>，总流量在</span><span>1</span><span>｝�/span><span>10L/min</span><span>。该校准单元模块是半自动的、�/span><span>PAN</span><span>校准单元咋�/span><span>PAN</span><span>分析单元通过气动</span><span>PFA</span><span>阀门连接。在校准模式，样品来自于校准模块的过流组件。校准单元需要的过氧乙酰自由基由丙酮光解生成，这些过氧乙酰自由基首先会氧匕�/span><span>NO</span><span>丹�/span><span>NO<sub>2</sub></span><span>，然后生戏�/span><span>PAN</span><span>、�/span></p><p><span>校准单元经过</span><span>German Tropospheric Research Focus</span><span>＇�/span><span>TFS</span><span>（�/span><span>的质量保证程序的评价，他们使用了两种独立的技术进行评判，</span><span>PAN</span><span>的产率确定为</span><span>92%��3%</span><span>。同时发现这个参数在很宽范围的操控条件下都稳定适用，例妁�/span><span>0.1</span><span>｝�/span><span>30ppb</span><span>皃�/span><span>PAN</span><span>�?/span><span>10L/min</span><span>的流量下、�/span></p><p><span>因为背景站中</span><span>CCl<sub>4</sub></span><span>的浓度相当稳定，所以其出峰可以作为内标来评件�/span><span>ECD</span><span>的响应、�/span></p><p><strong><span>稀释用的零氓�/span></strong></p><p><span>高纯空气，成分为</span><span>21%O2</span><span>，其余为</span><span>N2</span><span>，经净化管净化、�/span></p><p><strong><span>技术参�?/span></strong><strong></strong></p><p><span><strong></strong></span><strong><span>分析单元</span></strong><strong></strong></p><p><span>方法：气相色谱法</span></p><p><span>预柱和主柱：宽孔毛细管柱</span></p><p><span>检测器９�/span><span> ECD</span><span>检测器</span></p><p><span>控制</span><span>/</span><span>数据采集：双</span><span>USB</span><span>接口数据采集设备</span></p><p><span>软件：基亍�/span><span>Windows 7</span><span>操作系统，完成数据采集，积分和控刵�/span></p><p><span>数据格式９�/span><span>PAN</span><span>浓度数据丹�/span><span>.gc</span><span>文件，能�?/span><span>Excel</span><span>打开；色谱原始数据为</span><span>.adc</span><span>文件，能�?/span><span>adam32</span><span>软件打开并进行数据后处理</span></p><p><span>尺寸９�/span><span>19“�/span><span>机柜</span><span>3U</span><span>＇�/span><span>45��45��13.5cm</span><span>（�/span></p><p><span>重量：大�?/span><span>15kg</span></p><p><span><strong></strong></span><strong><span>校准单元</span></strong><strong></strong></p><p><span>方法：使�?/span><span>NO</span><span>标气连续光化学反应合成的方法；转换效率为</span><span>92%��3%</span></p><p><span>稀释气体：零空气经过氧化剂和活性炭纯化＇�/span><span>5L/min</span><span>（�/span></p><p><span>环境温度９�/span><span>30</span><span>ℂ�/span><span>（可选耐受更高温度（�/span></p><p><span>尺寸９�/span><span>19’‘�/span><span>机柜</span><span>2U</span><span>＇�/span><span>45��45��9 cm</span><span>（�/span></p><p><span>重量：大�?/span><span>12kg</span></p><p><span>仪器总电源：</span><span>220VAC</span><span>＋�/span><span>300W</span></p> </div> 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