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高纯氩色谱分析仪简述高纯气体分析中的实际问题

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高纯氩色谱分析仪简述高纯气体分析中的实际问题

发布日期:2015-11-19 13:36 来源:http://nilioo.com 点击:

高纯氩色谱分析仪滚球体育app简述高纯气体分析中的实际问题


   “超纯气体”一词是在1964年全国超纯气体测试年会上定义的,即凡气体纯度达5个“9”( 99.999%)以上,总杂质为10x10-6V/V(即10ppm)以下的气体皆属“超纯气体范畴。但五十年的发展已经改变了这一定义;已经把5个“9”气体称为高纯气,而称6个“9”以上纯度气体才为超纯气。纯度大于99%以上的气体纯度分析都采用扣除杂质的差减法计算,因而气体纯度分析实际是对气体中微量或痕量的杂质气体检测。因其检测方法很多,本文不全面论述,仅对气相色谱仪滚球体育app检测杂质气体的现状作一小结,并对某些概念上的认识提出看法。水分也是一种杂质气体,而且是极为特殊的、又无处不在的气体杂质,因检测手段特殊,本文也不予论述。


滚球体育app     DALIANGAOCHUNYASEPUFENXIYIGONGSITICHUDEGAOCHUNQITIFENXIZHONGCHUXIANDE“BENDI”、“ZUIXIAOJIANCENONGDU”HE“DINGLIANGYUWUCHA”,DOUSHIHENLIANGFENXIZHONGDELILUNWENTI、YESHISHIJIWENTI。ZHEILIBUXUSHULILUNDETUIDAO,DANYONGLILUNJIEJUEWENTI,ZHUYAOJIUSHIJIZHONGDERENSHIWENTIZHONGDIANLUNSHU,HUANYINGCANJIATAOLUN。

  1、DINGLIANGYUWUCHA

  MEITAIQIXIANGSEPUYIFENXIGAOCHUNQITIBIXUZUODAOYOUXIANGYINGBEICEZAZHIQIDEMINGANDUHEJIAOHAOZHONGFUXING。WOMENRENWEIZAIBAOZHENGSHANGSHUTIAOJIANHEMANZUBENDIYAOQIUTIAOJIANXIA,YIQIDEDINGLIANGWUCHAZHUYAOQUJUEYUBIAOZHUNQIDEZHUNQUEDU(KEKAOXING)。DUIYUHENLIANGCHENGFENZHONGFUCELIANGDEXIANGDUIWUCHAWANGWANGBICHANGLIANGFENXIDADEDUO。DUI0.1—10ppmNONGDUDEJIANCEZHONGFUXING(XIANGDUIWUCHA),ZAI10—20%DEXIANGDUIWUCHAYESHIJIAOHAODE;PPTJIDEZAZHIQI,KEYIYUNXUYOUYIGESHULIANGJIZHICHA。ZAIDINGLIANGFANGFASHANGDOUCAIYONGLE“WAIBIAOFA”,JISHIYONGBIAOZHUNQIXIAOZHENG。ZAISHIYANSHIKEYIZUODAOYONGDUOZHONGPEIZHIBIAOZHUNQIFANGFAJIAOZHENG,NENGDEDAOJIAOGAODEKEKAOXING。ERZAISHIJISHIYONGZHONGNANDUHENDA,YINCIGUOJIAZAIBIAOZHUNQIDEPEIZHISHANGYAOQIUSHIHENYANGEDE。

  2、ZUIXIAOJIANCENONGDU

  SEPUJIANCEQIZUIXIAOJIANCENONGDUQUJUEYU,YISHIJIANCEQIDEMINGANDU。MINGANDUYUGAOJIANCEQIJIANCEDEZAZHINONGDUYUDI;ERSHISEPUFENGDEFENGKUANYUXIAO(ZHUXIAOYUGAO),JIANCEZAZHIQINONGDUYUDI。JUTIDUIYUZUIXIAODEFENGFENGGAOBIXUSHIZAOSHENGDELIANGBEIXINHAO。RENHESEPUYIJIANCEQIDEZUIXIAOJIANCEZHIJIUSHIZUIXIAOJIANCENONGDU。YIQICAOZUOZHEDOUYINGZHIDAO,DIYUCINONGDUDEZHI(MEIYOUCHUFENG)BUYINGSHI“0”,ERYINGSHIXIAOYUZUIXIAOJIANCENONGDUZHI。LILUNSHANGYERENWEIZHINENGJIEJINYU“0”,ERBUNENGDENGYU“0”。DUIYULIANXUJIANCEDESHUZIXIANSHIYISUOXIANSHIDE“0”YEYINGZHEIYANGKAN,YINWEIXIANSHIBUNENGBIAOSHICHUXIAOYUTAZUIXIAOJIANCENONGDUDEZHILAI。YINERSUOYOUYIQIZAIJIANCEZAZHISHI,RUGUOWEINENGCECHUHANLIANG,ZEJIBAOGAOZHONG,GAIZUFENHANLIANGJIUYINGXIECHUXIAOYUZUIXIAOJIANCHUNONGDUZHI,ERBUNENGXIE“0”。

滚球体育app   3、BENDI

  “BENDI”SHIZHIZAISEPUZAIQIZHONGHANYOUDEBEICEZAZHIQITI,PEIBIAOZHUNQIYONGDIQIZHONGHANDEBEICEZAZHIQI;CESHIXITONG(ZAIQIXITONGYUYANGPINQIXITONG)DAILAIDEHUOBEILOURUDE(YIYANG、DANWEIZHU)GAIZAZHIQI。DADUOSHUNONGDUXINGJIANCEQIDOUYAOQIUBENDIZHIYUANXIAOYUTADEZUIXIAOJIANCENONGDU。DANGZAIQIZHONGBENDIZHIDAYUYANGPINQIZHONGMOUZAZHINONGDUSHI,GAIZAZHIQIHUICHUXIAN“FANFENG”。PEIZHIBIAOZHUNQIDEDIQIYAOQIUJIUGENGYANGELE,FOUZEBENDIZHIZHIJIEYINGXIANGDINGLIANGLE。DANSHIZHILIANGJIANCEQI(YIHUOYANLIZIHUAJIANCEQIWEIZHUDE)SHILIWAI。WOMENZAIJIANCEYANGZHONGTINGLEIZAZHISHIFAXIAN,YONGCHUNDANQI(4GE“9”)ZUOZAIQI(QINGQIHEKONGQIXIANGTONG),YENENGJIANCEDAO0.1ppmDETING(YIBANGUOCHANSEPUYI),NAIZHI20—50ppmDETINGZAZHIQI。ZHEISHIYINWEIZAIQIZHONGDEZAZHI(YANG、QING、YIYANGHUATAN、ERYANGHUATANFIDSHANGWUXIANGYING,JIAWANHANLIANG≤5ppm)YINNONGDUBUBIAN,ZHINENGSHIJIANCEQI(FID)CHANSHENGYIGEXIANGYINGWENDINGDE“JILIU”,ZHIYAOJISHUPINGHENG、ZAOSHENGXIAO,0.1ppmDETINGLEIZAZHIQIRENGJIUKEYIZAIJIXIANSHANGCHUYIGEFENG。QIXIANGSEPUDINGLIANGGUIDING,ZUIXIAODEJIANCEFENGDEPANDING:ZUIXIAODEFENGFENGGAOZHISHIERBEIYUZAOSHENGZHI。GUOQUGUOCHANYIQIZHINENGJIANCE0.1ppmDETINGSHIYINWEIYIQIDEZONGZAOSHENGZHIJIAOGAO。ZHIYAOJIANGZONGZAOSHENGZHIXIAJIANGYIGESHULIANGJI,ZEZUIXIAOJIANCEFENGJIUHUITIGAOYIGESHULIANGJI。WOGONGSIDEFIDMINGANDUZHIBIAORENGSHIMt≤1×10-11g/s(ZHENGSHILIUWAN),HEQITACHANGJIADEZHIBIAOYIYANG,DANZONGZAOSHENGZHIDI。YINCI,“QINGYANXINGQIXIANGSEPUYIZHINENGJIANCEYUBENDIDIANLIUZHIXIANGJIN”DESHUOFASHIQUEFAGENJUDE。ERWOMENZAILIYONGNONGSUOFA,SHITINGZHONGYIGUIJIANCEKEYICEDAOppbJI。

  本底值影响最大的是分析高纯气中氮和氧(空气中的主要成分)。经纯化后的载气如仍产生本底影响,其主要原因是漏气产生的。管路中有接头、阀、表等就不可避免会漏入空气。我们只能控制一定漏量,使之不影响分析。也就说“漏气”是绝对的,“不漏”只是相对的。例如使用高纯氩气分析仪滚球体育app时,为保证分析纯气纯度必须优于6个“9”。我们将载气净化到7个“9”以上,留出一定“空间”,使“漏气”后仍满足分析要求。在高纯气体分析仪上不允许使用有机材料作密封(因为空气中氮、氧能穿透有机材料渗透进入系统中),包括各种橡胶,聚四氟乙烯等[27];另外,还要尽量少用卡套。检测时样气(标气)流路也一样存在漏气问题。我们已找到改变分析操作能判断是否有漏气方法,并能大致确定漏量大小。还有“在检测<20ppb超低微量气体成分时,不能采用紫铜及一般不锈钢材料”的说法也欠根据。氦离子化检测器和电子捕获检测器都是能直接捡测ppb级的检测器,在仪器上我们仍用一般紫铜与不锈钢管作连接管与色谱柱,只是要将管内清洗和置换干净就能满足要求。

高纯氩色谱分析仪

相关标签:高纯氩色谱分析仪

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