酸液浓度和总铁含量应该在操作中每小时检查一次。
Acid strength and total iron shall be determined every hour during operation from outlets.
本发明涉及一种利用分光光度技术测定海水中亚铁、三价铁及总铁含量的简便准确方法。
The invention relates to a method for simply, conveniently and accurately measuring the contents of ferrous, ferric iron and total iron in seawater by utilizing a spectroscopic luminosity technology.
结果表明：该地区以地下水为水源的水厂水中总硬度、铁、锰的含量较高，超标严重。
The report indicates that the samples from waterworks using underground water as the source have much higher Ca, Mg, Fe and Mn content than the standards permitted.
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