Reagent Grade Water Types

And for preparation of reagents for chemical analysis or synthesis.

Reagent grade water types. Feed water to the final polishing step must have a maximum conductivity of 20 µs cm at 298k 25 c. Resistivity is 1 mega ohms. Total organic carbon toc 50 ppb. Silica 3 ppb.

1 2 1 type i grade of reagent water shall be prepared by distillation or other equal process followed by polishing with a mixed bed of ion exchange materials and a 0 2 µm membrane filter. What does type 1 water mean. Reagent water has quantitative specifications that describe the level of purity for the water. Type iv reagent grade water typically generated by reverse osmosis has become meaningless in that it has almost no practical use in the modern laboratory other than as feed water to a type i or type ii di system.

In most modern labs type ii water is only used for rinsing glassware and as feed water to a type i di polishing system. 1 2 the method of preparation of the various grades of reagent water determines the limits of impurities and shall be as follows. As feed to type 1 water systems clinical analyzers cell culture incubators and weathering test chambers. This water is considered type ii water.

Conductivity is 1 us cm. Chloride 5 ppb. A type i grade of reagent water shall be prepared by distillation or other equal process followed by polishing with a mixed bed of ion exchange materials and a 0 2 µm membrane filter. The shelf life is 24 months dependent on storage conditions not manufactured from distilled water.

Type ii reagent grade. These specifications have been described by astm american socity for testing and materials d1193 iso international organization for standardization 3696 and clsi clrw.