Pure Water Standards

Detailed below is a brief summary of the existing standard for water quality.  Please note that although this web site is regularly updated it is possible that any recent changes may not be shown and we do not therefore accept any liability for errors.  For a full copy of the latest standards or for more information please contact us directly. (=Pro-Analitika Kft, Hungary)

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BS EN ISO 3696 water for analytical laboratory use

Parameter

Grade 1

Grade 2

Grade 3

pH value @ 25 C

N/a

N/a

5.0 7.5

Conductivity, s/cm @ 25 C

0.1

1.0

5.0

Oxidisable matter Oxygen (O) content, mg/l

N/a

0.08

0.4

Absorbance @ 254 nm (1cm cell), abs units

0.001

0.01

NS

Residue 110 C, mg/Kg

N/a

1

2

Silica (SiO), mg/l

0.01

0.02

NS

ASTM Standard specification for reagent water D1193 - 06

Parameter

Type-I

Type- II

Type-III

Type-IV

Resistivity, MΩ-cm

18.0

1.0

4.0

0.2

pH

-

-

-

5.0-8.0

Total Organic Carbon TOC, g/l

50

50

200

-

Sodium, g/l as Na

1

5

10

50

Chloride, g/l as Cl

1

5

10

50

Total Silica, g/l

3

3

500

-