CN105436157B - 气相色谱仪气体管路的维护方法 - Google Patents
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Abstract
本发明公开了气相色谱仪气体管路的维护方法，它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的60‑70%，无水乙醇通入气体管路前预热至60‑70℃，将气体管路两端封口10‑20min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇‑烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至30‑40℃后保温20‑30min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气；（5）、继续通入加压氮气3‑7min，加压范围为2‑4Mpa，通入加压氮气的同时加热气体管路至40‑50℃。
Description
技术领域
本发明涉及气体组分检测领域，尤其涉及气相色谱仪气体管路的维护方法。
背景技术
气相色谱仪在石油、化工、生物化学、医药卫生、食品工业、环保等方面应用很广。它除用于定量和定性分析外，还能测定样品在固定相上的分配系数、活度系数、分子量和比表面积等物理化学常数。一种对混合气体中各组成分进行分析检测的仪器。气相色谱仪的型号种类繁多，但基本结构是一致的。它们都是由气路系统、进样系统、分离系统、检测系统、数据处理系统和温度控制系统六大部分组成。将分析样品在进样口中气化后，由载气带入色谱柱，通过对欲检测混合物中组分有不同保留性能的色谱柱，使各组分分离，依次导入检测器，以得到各组分的检测信号。按照导入检测器的先后次序，经过对比，可以区别出是什么组分，根据峰高度或峰面积可以计算出各组分含量。通常采用的检测器有：热导检测器，火焰离子化检测器，氦离子化检测器，超声波检测器，光离子化检测器，电子捕获检测器，火焰光度检测器，电化学检测器，质谱检测器等。
气相色谱仪中的气路系统尤其是气源至气相色谱仪的连接管线需要定期清洗，否则管路中容易积聚气体中的杂质，缩短气相色谱仪的使用寿命，降低柱效率，引起基线漂移、降低检测器的效率和响应，使微量测定不准，严重时甚至堵塞气体管路使其不通。
发明内容
本发明要解决的技术问题是气相色谱仪中的气体管路没有系统的清洗方法，气体管路容易积聚气体中的杂质进而影响测定效果甚至堵塞气体管路，为此提供一种气相色谱仪气体管路的维护方法。
本发明的技术方案是：气相色谱仪气体管路的维护方法，它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的60-70%，无水乙醇通入气体管路前预热至60-70℃，将气体管路两端封口10-20min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇-烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至30-40℃后保温20-30min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气，直至气体管路内的乙醇-烷基苯磺酸钠的混合液被完全赶走；（5）、继续通入加压氮气3-7min，加压范围为2-4Mpa，通入加压氮气的同时加热气体管路至40-50℃。
本发明的有益效果是先用无水乙醇对气体管路进行消毒预处理，再利用烷基苯磺酸钠发泡作用对气体管路内表面进行微震荡，泡沫破裂时带动无水乙醇对气体管路表面进行冲刷，可以有效去除气体管路内吸附的杂质，最后通入氮气干燥，清洁效果好，且不会引入新的污染。
具体实施方式
下面结合实施例对本发明做进一步说明。
实施例1：气相色谱仪气体管路的维护方法，它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的60%，无水乙醇通入气体管路前预热至60℃，将气体管路两端封口10min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇-烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至30℃后保温20min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气，直至气体管路内的乙醇-烷基苯磺酸钠的混合液被完全赶走；（5）、继续通入加压氮气3min，加压范围为2Mpa，通入加压氮气的同时加热气体管路至40℃。
实施例2：气相色谱仪气体管路的维护方法，它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的65%，无水乙醇通入气体管路前预热至65℃，将气体管路两端封口15min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇-烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至35℃后保温25min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气，直至气体管路内的乙醇-烷基苯磺酸钠的混合液被完全赶走；（5）、继续通入加压氮气5min，加压范围为3Mpa，通入加压氮气的同时加热气体管路至45℃。
实施例3：气相色谱仪气体管路的维护方法，它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的70%，无水乙醇通入气体管路前预热至70℃，将气体管路两端封口20min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇-烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至40℃后保温30min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气，直至气体管路内的乙醇-烷基苯磺酸钠的混合液被完全赶走；（5）、继续通入加压氮气7min，加压范围为4Mpa，通入加压氮气的同时加热气体管路至50℃。
本发明对无水乙醇先进行预热至60-70℃，可以激活无水乙醇的分子活性，为下一步的与烷基苯磺酸钠的混合发泡创造条件，通入的无水乙醇与气体管路内壁接触，先清洗气体管路内壁的大颗粒杂质，通入烷基苯磺酸钠后与无水乙醇混合充满气体管路，保温20-30min后使其能充分混合发泡，利用发泡破裂产生的气压带动无水乙醇冲刷气体管路内壁，使得气体管路内壁吸附的小颗粒杂质也被有效溶解剥离，再用氮气从气体管路的底部通入，利用氮气比空气轻的原理将乙醇-烷基苯磺酸钠的混合液从气体管路的顶部赶出，最后通入加压的氮气对气体管路内部干燥，不引入新的杂质，清洁效果干净彻底。
Claims (1)
1.气相色谱仪气体管路的维护方法，其特征是它包括以下步骤：（1）、用无水乙醇通入并占据气体管路体积的60-70%，无水乙醇通入气体管路前预热至60-70℃，将气体管路两端封口10-20min；（2）、打开气体管路的一端封口，通入烷基苯磺酸钠使得气体管路内被乙醇-烷基苯磺酸钠的混合液充满；（3）、再次将气体管路两端密封，待气体管路温度降至30-40℃后保温20-30min；（4）、将气体管路竖立安置，打开气体管路的顶部封口，并从气体管路的底部封口通入干燥氮气，直至气体管路内的乙醇-烷基苯磺酸钠的混合液被完全赶走；（5）、继续通入加压氮气3-7min，加压范围为2-4Mpa，通入加压氮气的同时加热气体管路至40-50℃。
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