Qualitative methods can be determined by pH indicator and pH test paper, and quantitative pH determination requires pH meter. Total dissolved solids refers to the total amount of all solutes in water, including the contents of inorganic substances and organic substances. Generally, the salt in the solution can be roughly known by the conductivity value. Generally, the higher the conductivity, the higher the salt content and the higher the TDS.
Among inorganic substances, there may be molecular inorganic substances besides ionic components. Because the organic matter and molecular inorganic matter contained in natural water can generally be ignored, the salt content is generally called total dissolved solids. However, TDS can not effectively reflect the water quality of a specific water body.
Extended data:
KH is calculated as the anion equivalent to bicarbonate (HCO 3-), which can be used to indicate the concentration of HCO 3 in water. It is called bicarbonate or bicarbonate, not carbonate, but sometimes it is also called carbon hardness or bicarbonate hardness.
German hardness is calculated by calcium oxide (CaO) and has nothing to do with carbonate hardness. Can't call it calcium oxide hardness. 100 ml of water contains 1 mg equivalent or 1 mg equivalent of calcium oxide. It is not called carbonate hardness or calcium oxide hardness. German hardness is soft water after 8 degrees gh calculated by calcium oxide.
The national standard GB5749-2006 "Hygienic Standard for Drinking Water" requires the limit of dissolved total solids (TDS) for drinking tap water: TDS ≤≤1000 mg/L/L.
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