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【万达环保】实验室純化水設備實驗室用水等級劃分有哪些？

來源： | 發布日期：2021-12-07

水是實驗室內一個常常被忽視但至關重要的試劑。實驗室用水有那些種類？能達到什麽級別？不同實驗對水的要求有哪些？

實驗室用水等級劃分

根据GB/T 6682-2008《分析实验室用水规格和试验方法》的规定,分析实验室用水的原水应为饮用水或适当纯度的水。并将实验室用水分为三个级别：一級水、二級水和三級水。

一級水用于有嚴格要求的分析實驗，包括對顆粒有要求的實驗，如高效液相色譜用水。一級水可用二級水經過石英設備蒸餾水或離子交換混合窗處理後,再0.2納米微孔濾膜過濾來制取。

二級水用于無機痕量分析等實驗,如原子吸收光譜人系用水。二級水可用多次蒸餾或離子交換等制取。

三級水用于一般的化學分析試驗。三級水可用蒸餾或離子交換的方法制取。

評價水質等級的技術指標如下：

指標	一級	二級	三級
pH值範圍（25℃）	--	--	5.0-7.5
電導率（25℃），mS/m.≤	0.01	0.1	0.5
可氧化物質（以0計），mg/L＜	--	0.08	0.4
吸光度（254nm,25px光程）≤	0.001	0.01	--
蒸發殘渣（105°±2℃），mg/L≤	--	1	2
可溶性矽（以SiO2計）mg/L＜	0.01	0.02	--

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