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。
This article attempts to use grey correlation analysis method to identify the main factors affecting total hardness and to analyze its genetic mechanisms .
本文试用灰色关联分析方法，找出影响 总 硬度的主要因素，分析成因机理。
The Use of Excel in Evaluation of Uncertainty for Total Hardness in Drinking Water
Excel在饮用水中 总 硬度测量结果的不确定度评定中的应用
Impact of Determination Conditions on The Determination of Total Hardness
浅谈测定条件对 总 硬度测定的影响
The main environmental concern is the increase of total hardness of water .
总 硬度污染是城区地下水的首要污染物，有逐年增加的趋势。
The relationship between phytoplankton biomass and the pH total alkalinity total hardness and salinity was all described as parabola .
浮游植物生物量与pH、总碱度、 总 硬度、含盐量呈抛物线关系。
Study on Determination Of Total Hardness Of Water With ICP-AES
应用ICP-AES技术测定水 总 硬度的方法研究
The least influence is total ammonia nitrogen nitrate total hardness and ammonia .
第四类为铵氮、硝酸盐、 总 硬度和非离子氨。
Evaluation of Uncertainty in Determination of Total Hardness in Water
水中 总 硬度测定结果的不确定度评定
Correlation Study on Total Hardness of Drinking Water with Some Anions in Beijing Area
北京地区饮水中 总 硬度与几种阴离子相关关系的研究
There is no significant difference in 15 items as color turbidity total hardness and pH figures .
色度、浑浊度、 总 硬度、pH值等15项合格率无显著性差异（P>0.05）。
The single factor prediction model only utilizes one parameter of the rock material properties such as rock uniaxial compressive strength Brazilian tensile strength or the total hardness to predict the TBM penetration rate .
单因素预测模型中包括的主要岩石材料参数有岩石单轴抗压强度、抗拉强度及岩石的 总 硬度；
Research on fast measuring methods of determining basicity calcium stiffness and total hardness on cyclic cooling water
循环冷却水中碱度、钙和 总 硬快速测定法研究
Thus it is predicted that the increase reason about the total hardness is likely to the mineral precipitation / dissolution ion exchange in vadose zone . 3 .
由此推断，地下 水中 硬度升高主要是包气带矿物溶解和离子交换的结果。
Main indicators of exceed the standard were the Total number of bacterial colony total coliform bacteria thermotolerant coliform bacteria fluoride nitrate chloride total hardness .
超标的主要指标有：细菌学指标中的菌落总数、总大肠菌群、耐热大肠菌群；毒理学指标中的氟化物、硝酸盐；感官性状和一般化学指标中的 总 硬度、氯化物。
The Characteristics of Groundwater Chemical and Numerical Simulation of Total Hardness in the Suburb of Beijing
北京市郊区地下水化学特征及 总 硬度数值模拟
Analysis on Determining the Total Hardness of Water
关于测定水中 总 硬度的分析
PH residual chlorine total alkalinity total hardness total dissolved solids sulphate chloride nitrate copper zinc cadmium and tin are all up to the standards .
而pH、余氯、总碱度、 总 硬度、溶解性总固体、硫酸盐、氯化物、硝酸盐、铜、锌、镉、锡均合格。
Total hardness and total solids appear positive correlation with nitrate but no correlation with ammonium .
总 硬度和总固体与硝酸盐氮呈显著正相关，与氨氮未表现出相关关系。
The results show that total phosphorus total nitrogen total hardness and heavy metal elements have cumulative effect .
结果显示，塌陷水域中总磷、总氮、 总 硬度、重金属元素等指标具有累积效应。
Permanganate index removal rate drops markedly with operation time increasing ; the drop scope is 12.5 % in 80 h while the total hardness removal changes little .
对高锰酸盐指数的去除率随运行时间的增加而明显下降，在80h内降幅达12.5%，而 总 硬度的去除率则随运行时间变化不明显；
This study revealed that total hardness is highly associated with flouride negatively .
本次研究结果表明， 总 硬度与氟化物显著负相关。
The uncertainty of measurement for the determination of total hardness of drinking water by EDTA titration method was evaluated .
对乙二胺四乙酸二钠滴定法测定生活饮用水 总 硬度的测量不确定度进行评定。
Micro weight titration for determining the total hardness of industrial circulating cooling water ;
工业循环冷却水系统 藻类及 细菌等微生物污染会 大大影响系统的工作效率。
The experiment has showed that it is feasible to combine AC and NF to obtain high quality drinking water from groundwater the removal of organic pollutant was over 80 % and conductivity over 80 % and total hardness over 90 % .
对有机物的去除率在80%以上，对电导率、 总 硬度的去除率也分别达到80%和90%，对其它污染物也有较高的去除率。
Evaluation of Uncertainty for Determination of Total Hardness in Water by EDTA Titration
EDTA滴定法测定水中 总 硬度的不确定度评定
Evaluation of the uncertainty of measurement of total hardness of drinking water
生活饮用水 总 硬度测量结果的不确定度评定
Comparison test of total hardness of the ground water quality by robust statistical techniques
稳健统计法在水质 总 硬度检测比对中的应用
美[ˈtotl ˈhɑrdnɪs]英[ˈtəutəl ˈhɑ:dnɪs]
（水的）总硬度