Uncertain degree is evaluated to adopt EDTA titrimetric law to measure total hardness of water quality.
采用EDTA滴定法测定水质总硬度的测量不确定度评定。
Making use of the cause and effect diagram to analyse the sources and influences of uncertainty in determination of total hardness in water by EDTA titrimetric method was introduced.
采用直观的因果图，对EDTA滴定法测定水中总硬度的不确定度的来源及其对测量不确定度的影响进行分析。
In the process of water softening, hardness is reduced, and total content.
水在软化过程中，仅硬度降低，而总含量不变。
Because the changing of source water, obvious variety of total degree hardness index about the new source water caused the difference on residents' taste.
结果显示因供水水源的更换，新供水系统总硬度指标显著变化，导致口感差异；
Adoption of this crosslinking mode could markedly improve water resistance, solvent resistance, glossiness and hardness of the film. 6.5w % DAAM out of total monomer mass was preferred.
采用该交联体系，可显著提高涂膜的耐水性、耐溶剂性、光泽度及硬度，DAAM的用量以占总单体质量的6.5%为好。
Adoption of this crosslinking mode could markedly improve water resistance, solvent resistance, glossiness and hardness of the film. 6.5w % DAAM out of total monomer mass was preferred.
采用该交联体系，可显著提高涂膜的耐水性、耐溶剂性、光泽度及硬度，DAAM的用量以占总单体质量的6.5%为好。
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