Water Purification for Laboratory

The latest Reverse Osmosis (RO) technology can help to improve water quality and laboratory
productivity, provided that basic process and operating guidelines are followed.

This paper offers advice on how to choose between stand alone and centralised systems and highlights the key issues that technicians and laboratory staff need to consider when choosing an appropriate system. Reverse osmosis (RO) is a powerful method of producing purified water for a wide range of laboratory duties. Poor specification and incorrect maintenance procedures can significantly reduce the quality of output from reverse osmosis (RO) water purification systems. However, a well specified, well managed RO water purification system from a trusted and experienced supplier can deliver to the laboratory an efficient, economical and reliable supply to an exceptionally high level of purity. Choosing, operating and maintaining an RO system should be straightforward. So what are the specific problems that prevent the best results from being achieved in the lab? In some cases, the specification fails
to match the application, while in others it is simply that efficiently processed pure water is wrongly used. A series of key issues need to be considered by technicians and laboratory staff when choosing an appropriate water purification system. Armed with this knowledge, the latest technology can then be specified to help to improve water quality and laboratory productivity.

Reverse osmosis

Reverse osmosis is capable of producing purified water, in large volumes, from a supply fed under pressure into a module containing a semi-permeable membrane, which removes up to 98% of inorganic ions, plus virtually all colloids, micro-organisms, endotoxins and organic macromolecules. There are several grades of water purity, expressed in terms of conductivity, defined in the current standards as BS EN ISO 3696 or ASTM D1193-06 ‘Water for analytical laboratory use’. ASTM Type 1 represents the highest level of purity at the maximum of 18.2 µs/cm, Type 3 (< 0.2 µs/cm), Type 2 (< 1 µs/cm) and Type 4 (< 5 µs/cm). ISO Grade 1 (< 0.1µs/cm),Grade 2 (< 1µs/cm), and Grade 3 (<5µs/cm).

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