溶解氧電極校準(zhǔn)和使用

1、標(biāo)定和使用 DO1、把電極連接在溶解氧測(cè)試儀上，打開(kāi)儀器電源開(kāi)關(guān)，以使DO發(fā)生極化作用。 極化時(shí)間需要大約 15 分鐘。2、把DO電極頭放入到飽和氧的蒸餾水的燒杯中。（飽和氧的蒸餾水可以通過(guò)向盛有蒸餾水的燒杯中持續(xù)通入氧氣或空氣 30 分鐘，此時(shí)獲得的是特定溫度和飽 和水蒸汽壓下的飽和氧水溶液。 ）3、當(dāng)讀數(shù)穩(wěn)定后，按照溶氧測(cè)試儀生產(chǎn)廠家提供的說(shuō)明書，并根據(jù)附表的標(biāo)準(zhǔn) 數(shù)據(jù)，調(diào)整讀數(shù)。此步驟需要根據(jù)測(cè)試樣品所處環(huán)境而重復(fù)操作幾次。4、接著，把DO電極頭放入盛有無(wú)氧蒸餾水的燒杯中。（無(wú)氧蒸餾水可以通過(guò)往 盛有蒸餾水的燒杯中， 持續(xù)充入氮?dú)?20 分鐘左右而制備。 也可以通過(guò)在 50ml 的 蒸餾

2、水加入足量的無(wú)水亞硫酸鈉【NaSO3而制備，確保測(cè)試過(guò)程中溶液底部有 晶體可見(jiàn)。）5、當(dāng)讀數(shù)穩(wěn)定后，調(diào)整溶氧測(cè)試儀上的零位控制器，直至儀表顯示讀數(shù)為零。6、用蒸餾水沖洗電極。7、此時(shí)電極可以開(kāi)始測(cè)量。測(cè)量時(shí)，把電極探頭放入樣品溶液液面以下大約大約 4 厘米。待讀數(shù)穩(wěn)定后，記下讀數(shù)。表 一：在水 -飽和的蒸餾水的溶解氧 （毫克/公升）（不同的溫度和壓力下 ）77| mmW mm754 mm74C' tun?30 ms72t ma710 XDH700nun(PC14.7614.57143814.1913.9913 SO13 6113.421°C14.3114.1914.C013.

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