Types Of Reagent Grade Water

Grade 1 grade 2 and grade 3 where grade 1 is the most pure see below.

Types of reagent grade water. Total organic carbon toc parameter has been added. The shelf life is 24 months dependent on storage conditions not manufactured from distilled water. The clsi has also briefly outlined other grades in less detail such special reagent water srw and instrument feed water. As feed to type 1 water systems clinical analyzers cell culture incubators and weathering test chambers.

2 type 2 laboratory grade water is used in general laboratory applications such as buffers ph solutions and microbiological culture media preparation. This water is considered type ii water. Preparation and testing of reagent water in the clinical laboratory in june of 2006 the clinical laboratory standards institute published the final draft of the 4th edition of preparation and testing of reagent water in the clinical laboratory this is an international nonprofit standards developing and educational organization that was previously known as nccls. 2 type 2 laboratory grade water is used in general laboratory applications such as buffers ph solutions and microbiological culture media preparation.

Type i reagent water may be produced with alternate technologies as long as the appropriate constituent. Reagent water has quantitative specifications that describe the level of purity for the water. These specifications have been described by astm american socity for testing and materials d1193 iso international organization for standardization 3696 and clsi clrw. Feed water to the final polishing step must have a maximum conductivity of 20 µs cm at 298k 25 c.

International organization for standardization iso the iso based its specification on iso 3696 1987 and specifies three grades of water. Silica 3 ppb. Conductivity is 1 us cm. Type ii reagent grade.

Different grades of water that are available the appropriate water grade applications or the cost to obtain the desired water grade. And for preparation of reagents for chemical analysis or synthesis. 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. Clinical laboratory reagent water can now be used in place of type i and ii water for most applications.

Autoclave and wash water will generally be a satisfactory replacement for type iii water. Sodium 5 ppb. 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.

As feed to type 1 water systems clinical analyzers cell culture incubators and weathering test chambers. Inattention to water quality in the lab can result in compromised experimental results contaminated reagents or damaged equipment. Perhaps the most significant change of this guideline is the addition of the toc parameter. What does type 1 water mean.

Chloride 5 ppb.