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        1. 上海乾思生物科技有限公司
          中級(jí)會(huì)員 | 第16年

          18916423352

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          SIGMA現(xiàn)貨,SIGMA代理

          實(shí)驗(yàn)室超純水機(jī)選購(gòu)技巧

          時(shí)間:2011/10/20閱讀:668
          分享:
          客戶在選購(gòu)超純水機(jī)時(shí)一定要向廠商提供原水的水質(zhì)狀況,比如泥沙多,硬度高,地下水等情況,超純水機(jī)的工藝是根據(jù)原水水質(zhì)的好壞來(lái)確定的,泥沙多,要添加預(yù)處理裝置,硬度高,要添加軟化裝置,含鹽量高,要采用二級(jí)反滲透工藝等。如果選用以純水為水源的超純水機(jī),則只需要提供水質(zhì)需求和用水量就可以了。用水量:目前市場(chǎng)上的超純水機(jī)的造水量一般在5—100升/小時(shí),20升以上的就是非標(biāo)準(zhǔn)機(jī)型??蛻魬?yīng)根據(jù)實(shí)際用水量來(lái)選用超純水機(jī)的規(guī)格,一般遵循4倍關(guān)系原則(注:1G(加侖)等于3.785升)。如用水量是20升/天,則選用規(guī)格為5升/小時(shí)的機(jī)器,如果選用規(guī)格太小,超純水機(jī)的耗材消耗會(huì)很快,選用規(guī)格太大,則形成浪費(fèi)。用水水質(zhì):國(guó)家實(shí)驗(yàn)室標(biāo)準(zhǔn)用水有一級(jí)水、二級(jí)水、三級(jí)水三種水質(zhì),但大多數(shù)實(shí)驗(yàn)室用兩種水質(zhì)即可,一是三級(jí)水,如蒸餾水,用于玻璃器皿的清洗等;二是一級(jí)水,主要用于化學(xué)分析或者液相、原子吸收等精密儀器分析??蛻魬?yīng)根據(jù)實(shí)際水質(zhì)需求來(lái)選用超純水機(jī)的檔次。以自來(lái)水為水源的超純水機(jī)都具有兩個(gè)(兩種水質(zhì))的出水口,一是純水,即三級(jí)水;二是一級(jí)水,即超純水(嚴(yán)格意義上講一級(jí)水的電阻大于10MΩ.cm,而超純水的電阻大于18MΩ.cm)。多數(shù)客戶對(duì)自己的水質(zhì)需求并不清楚,國(guó)家相關(guān)部門雖然有各種水質(zhì)標(biāo)準(zhǔn),但是對(duì)具體的實(shí)驗(yàn)項(xiàng)目或儀器分析用水沒(méi)有完整的量化指標(biāo),往往在選購(gòu)好超純水機(jī)之后才發(fā)現(xiàn)水質(zhì)不達(dá)標(biāo)。根據(jù)經(jīng)驗(yàn),可以遵循以下3個(gè)選購(gòu)原則,相對(duì)應(yīng)即可。1.目前用水來(lái)源:如果您目前的用水是合格的,也可以將該純水的來(lái)源方式告知我們,我們技術(shù)人員會(huì)根據(jù)該情況來(lái)推薦相應(yīng)的規(guī)格型號(hào)。2.實(shí)驗(yàn)內(nèi)容:分無(wú)機(jī)實(shí)驗(yàn)和有機(jī)實(shí)驗(yàn),無(wú)機(jī)實(shí)驗(yàn)只需電阻大于18MΩ.cm的水質(zhì)就行,而有機(jī)實(shí)驗(yàn)則通常要去除水中的有機(jī)物質(zhì),所以除了電阻大于18MΩ.cm以外,還需要總有機(jī)碳的指標(biāo)。如果是生物方面的實(shí)驗(yàn),在要去除水中的細(xì)菌。3.儀器種類:客戶可以根據(jù)使用的儀器種類來(lái)選擇超純水機(jī)。液相用水的電阻大于18MΩ.cm;并且要去除有機(jī)物;原子吸收、原子熒光及環(huán)境監(jiān)測(cè)儀器用水大于18MΩ.cm就行;PCR等生命科學(xué)儀器用水除了電阻大于18MΩ.cm以外,還需除菌,除有機(jī)物等。

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