飞鹰伦理影院

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測定石油酸值應注意哪些事項

发表时间：2018-11-29 15:56

測定石油酸值應注意哪些事項?

答：(1) 所用乙醇的纯度要符合要求，必要时应加以提纯处理。以除去所含的酸、醛和其它干扰物。

?(2)滴定時動作要迅速，盡量縮短滴定時間，以減少二氧化化碳對測定的影響。

(3)各次測定所加的指示劑的量要相同，不能太多，以免引起滴定誤差。

(4)滴定至終點附近時，應逐漸加入堿液，在估計差一兩滴就要到達終點時，改爲半滴半滴加，以減少滴定誤差。

?(5)爲了便于觀察指示劑的變色，可在錐形瓶下面襯以白紙或鋪有白色瓷板，使滴定在白色背景下進行。

?(6)油品顔色很深時，應改爲電位滴定或其它方法確定終點。

上一篇閉口閃點測定儀計量時注意事項有哪些?

下一篇高低溫運動粘度測定儀注意事項是什麽

文章分類：技術知識

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