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。
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。
Major Inorganic Components: Sodium, potassium, chloride, calcium, magnesium, alkalinity, total hardness, total phosphorus, fluoride, sulphate.
主要无机成分：钠，钾，氯，钙，镁，碱度，总硬度，总磷，氟化物，硫酸盐。
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