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RProgrammer (talk | contribs) →Measurement: Typo; it said gravimetric when it meant conductivity. The surrounding text above and below right here alone shows the correct meaning by context, so no need for a citation: conductivity is only applicable to measuring ionic solids (salts). |
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[[File:Tds-meter.jpg|thumbnail|right|TDS meter used to test water purity]]
The two principal methods of measuring total dissolved solids are [[gravimetric analysis]] and [[Conductivity (electrolytic)|conductivity]].<ref>{{cite web | url = http://www.epa.gov/quality/total-dissolved-solids-tds-epa-method-1601-gravimetric-dried-180-degrees-c |title=Total Dissolved Solids (TDS): EPA Method 160.1 (Gravimetric, Dried at 180 deg. C) |author=<!--Staff writer(s); no by-line.--> |date=1999-11-16 |publisher=U.S. Environmental Protection Agency (EPA) |___location=Washington, D.C.|archive-url=https://web.archive.org/web/20160223132222/http://www.epa.gov/quality/total-dissolved-solids-tds-epa-method-1601-gravimetric-dried-180-degrees-c |archive-date=2016-02-23 }}</ref> Gravimetric methods are the most accurate and involve evaporating the liquid [[solvent]] and measuring the mass of residues left. This method is generally the best, although it is time-consuming. If inorganic salts comprise the great majority of TDS,
Electrical, or specific, conductivity of water is directly related to the concentration of dissolved ionized solids in the water. Ions from the dissolved solids in water create the ability for that water to conduct an [[electric current]], which can be measured using a conventional [[EC meter|conductivity meter]] or '''TDS meter'''. When correlated with laboratory TDS measurements, [[Conductivity (electrolytic)|conductivity]] provides an approximate value for the TDS [[concentration]], usually to within ten-percent accuracy.
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