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href="http://mhjys.com.cn/SonList-2238104.html" target="_blank">便攜式紫外測(cè)油儀</a></strong>是在PH≤2的條件下，樣品中的油類物質(zhì)被正己烷萃取，萃取液經(jīng)無水硫酸鈉脫水，再經(jīng)硅酸鎂吸附除去動(dòng)植物油類等極性物質(zhì)后，于225nm波長(zhǎng)處測(cè)定吸光度，石油類含量與吸光度值符合朗伯-比爾定律，從而定量分析水中石油類的含量。（波數(shù)范圍：200-400nm）</div><div>　　正己烷的檢測(cè)是水質(zhì)石油類監(jiān)測(cè)的前提，而在新標(biāo)準(zhǔn)中對(duì)正己烷透光率的檢驗(yàn)和脫芳處理做出了要求：使用前于波長(zhǎng)225nm處，以水做參比測(cè)定透光率，透光率大于90%方可使用，否則需進(jìn)行脫芳處理。</div><div>　　新標(biāo)準(zhǔn)中將萃取液采用加入無水硫酸鈉振搖脫水，同時(shí)注明也可采用將萃取液過10mm無水硫酸鈉的玻璃漏斗脫水。如果脫水不*，同樣會(huì)導(dǎo)致測(cè)量結(jié)果偏大。</div><div>　　便攜式紫外測(cè)油儀采用振搖方式脫水時(shí)，稱取3g無水硫酸鈉到三角瓶中，蓋上蓋子，振搖數(shù)次，若中途發(fā)現(xiàn)無水硫酸鈉結(jié)塊，需補(bǔ)加無水硫酸鈉至不結(jié)塊為止。此種方法的優(yōu)勢(shì)是脫水的過程是密閉進(jìn)行的，不會(huì)有正己烷的揮發(fā)。</div><div>　　如果采用過10mm無水硫酸鈉玻璃漏斗脫水時(shí)，若無水硫酸鈉結(jié)塊，會(huì)發(fā)生堵塞，導(dǎo)致過濾不能正常進(jìn)行，此時(shí)可更換一支新的裝有無水硫酸鈉的玻璃漏斗進(jìn)行過濾。此過程會(huì)導(dǎo)致部分正己烷揮發(fā)，長(zhǎng)期會(huì)對(duì)工作人員健康造成嚴(yán)重危害。</div></p> </ul> <div class="824maem" id="news_sx"> <li id="824maem" class="sx_left">上一篇：<a 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