硬度的检定方法很多,普通约可分为三类,即重量分析法,肥皂液法和酸碱溶液滴定法;而后者只用一种标准溶液(酸溶液和碱溶液),能得较准确的结果,时间又甚经济,不论暂时硬度,永久硬度,镁硬度,负硬度均可测出,故采用此分析法者颇多。最近由苏联介绍一种与碱度及负硬度有关之含钠量,为操纵及调节水之软化之利器,亦属于此范围內,兹拟一并介绍,并先述硬度之测定法。 Hardness test a lot of ways, generally about can be divided into three categories, namely gravimetric method, soap solution and acid-base solution titration; the latter only a standard solution (acid solution and alkali solution) can be more accurate As a result, the time is economical. No matter whether the temporary hardness, the permanent hardness, the magnesium hardness or the negative hardness can be measured, many people adopt this method. Recently introduced by the Soviet Union as a sodium and alkalinity and hardness of the negative hardness, for the manipulation and regulation of water softening tool, also fall within this range, it is intended to be introduced together, and the hardness of the first statement.