Introduction:
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The material remaining at water after filtration for the suspended solids
analysis is considered to be dissolved.
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This material is left as a solid residue upon evaporation of the water and
constitutes a part of total solids.
Sources:
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Results from solvent action of water on solids, liquids and gases.
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Like suspended material, dissolved substances may ne organic or inorganic.
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Inorganic: Minerals, metals, gases.
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Organic: Decay products of vegetation, organic chemicals and organic gases.
Impacts:
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Total Dissolved Solids produces aesthetically displeasing color, tastes and
odors.
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Some chemicals may be toxic, and some of the dissolved organic constituents
have been shown to be carcinogenic.
Measurement:
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A direct measurement of TDS can be made by evaporating to dryness a sample of
water which has been filtered to remove the suspended solids.
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The remaining residue is weighted and represents the TDS in the water.
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The TDS is expressed as milligrams per liter on a dry-mass basis.
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The TDS can be calculated using the following equation:
TDS = (TS −TSS)
Where
TS=Total
solid,
TSS=Total suspended solid
Uses:
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This parameter is included for analysis of water and wastewater only as a gross
measurement of dissolved material.
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