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You are here: Home / Water Quality Standards / ASTM Standards

American Society for Testing and Materials (ASTM)


Standard Specification for Reagent Grade Water
 Type IType IIType IIIType Iv
Electrical Conductivity Max (pX/cm @ 25C)0.0561.00.255.0
Electrical Resistivity Min (MOhms-cm @ 25C)181.04.00.2
pH @ 25&#176C---5.0-8.0
TOC max (µg/L)10050200No Limit
Sodium max (µg/L)151050
Silica max. (µg/L)33500No Limit
Chloride max (µg/L)151050
When bacterial levels need to be controlled, reagent grade types should be further discussed as follows:
 Type AType BType C
Total Bacterial Count Max CFU/100ml1101000
Endotoxin max. IU.ml0.030.025-
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Water Quality Specialists

Definitioner

Sodium
an ion found in natural water supplies, and introduced to water in the ion exchange water softening process.
PH
the reciprocal of the logarithm of the hydrogen ion concentration. The ph scale is from zero to 14,and 7.0 is the neutral point, indicating the presence of equal concentrations of free hydrogen and hydroxide ions, ph values below 7.0 indicate increasing acidity, and ph values above 7.0 indicate increasing base concentrations.
Conductivity
the quality or power to carry electrical current; in water, the conductivity is related to the concentration of ions capable of carrying electrical current.