Reagent Grade Water Classification

Parameter grade 1 grade 2 grade 3 conductivity µs cm temp corrected ph at 25 c oxidizable matter oxygen o2 content mg l absorbance at 254 nm and 1 cm optical path length absorbance units residue after evaporation on heating at 110 c mg kg.

Reagent grade water classification. Reagent water reagent grade water may be ordered as deionized type i deionized type ii and distilled water. The clsi has also briefly outlined other grades in less detail such special reagent water srw and instrument feed water. Reagent water has quantitative specifications that describe the level of purity for the water. Astm standards for laboratory reagent water astm d1193 91.

As feed to type 1 water systems clinical analyzers cell culture incubators and weathering test chambers. Chemworld stocks this product in 1 to 275 gallon containers. Total organic carbon toc parameter has been added. Grade 1 grade 2 and grade 3 where grade 1 is the most pure see below.

What does type 1 water mean. Autoclave and wash water will generally be a satisfactory replacement for type iii water. 1 2 the method of preparation of the various grades of reagent water determines the limits of impurities and shall be as follows. 2 type 2 laboratory grade water is used in general laboratory applications such as buffers ph solutions and microbiological culture media preparation.

Chemworld reagent water specifications include. 1 2 2 type ii grade of reagent water shall be prepared by. These specifications have been described by astm american socity for testing and materials d1193 iso international organization for standardization 3696 and clsi clrw. Usp grade meets or exceeds requirements of the united states pharmacopeia usp.

And for preparation of reagents for chemical analysis or synthesis. 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. This grade is acceptable for food drug or medicinal use. Clinical laboratory reagent water can now be used in place of type i and ii water for most applications.

Feedwater to the final polishing step must have a maximum conductivity of 20 µs cm at 298k 25 c. Perhaps the most significant change of this guideline is the addition of the toc parameter. Technical standards on water quality have been established by a number of organizations including the american society for testing and materials astm international organization for standardization iso united states pharmacopoeia usp and the clinical and laboratory standards institute clsi previously known as the us national committee for clinical laboratory standards nccls. International organization for standardization iso the iso based its specification on iso 3696 1987 and specifies three grades of water.