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Total Dissolved Solids

Total dissolved solids (TDS) may be a measure of the dissolved combined content of all inorganic and organic substances present during a liquid in molecular, ionized, or micro-granular (colloidal sol) suspended form. TDS is usually mentioned as parts per million (ppm). Water quality levels are often tested employing a digital TDS PPM meter.

Generally, the operational definition is that the solids must be sufficiently small to survive filtration through a filter with 2-micrometer (nominal size, or smaller) pores. Total dissolved solids are normally discussed just for freshwater systems, as salinity includes a number of the ions constituting the definition of TDS. The principal application of TDS is within the study of water quality for streams, rivers, and lakes. Although TDS isn't generally considered a primary pollutant (e.g. it is not deemed to be related to health effects), it's used as a sign of aesthetic characteristics of beverage and as an aggregate indicator of the presence of a broad array of chemical contaminants.

 

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