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Inaccurate analysis results? Could it be due to pure water?
In daily experiments, we sometimes encounter inaccurate test results, especially in spectroscopic experiments that require ultrapure water as a reference. At such times, the cleanliness of the ultrapure water becomes critical. So, how can we ensure that the ultrapure water used in experiments is completely clean? We can approach this from two aspects: water production and water storage.
Laboratory ultrapure water systems require regular maintenance and cleaning to ensure water quality meets standards and operates stably over the long term. If the filter columns in the laboratory ultrapure water system are used and maintained improperly, they can easily be damaged, thereby affecting water quality standards.
First, let's understand the principle of ultrapure water systems.
Laboratory water purification systems generally use advanced reverse osmosis technology to produce pure water. The working principle of a water purifier is to apply a certain pressure to water, allowing water molecules and ionized mineral elements to pass through the reverse osmosis membrane, while the vast majority of inorganic salts (including heavy metals), organic matter, bacteria, and viruses dissolved in water cannot pass through the reverse osmosis membrane. This strictly separates the permeated pure water from the non-permeated concentrated water. The pore size on the reverse osmosis membrane is only 0.0001 micrometers, while the diameter of viruses is generally 0.02-0.4 micrometers, and the diameter of ordinary bacteria is 0.4-1 micrometers. The water produced by the purifier meets drinking water standards.

Ultrapure water systems build on reverse osmosis technology by adding ion exchange and terminal treatment technologies. Some also include deep ion desalination, ultrafiltration, and UV photo-oxidation equipment, producing water quality that exceeds the national standard GB/T6682-2008 requirements for Grade 1 laboratory water.
Key components affecting water quality:
Precision filter cartridges, activated carbon filter cartridges, reverse osmosis membranes, and purification columns are all materials with a limited lifespan. Precision filter cartridges and activated carbon filter cartridges actually protect the reverse osmosis membrane. If they fail, the load on the reverse osmosis membrane increases, shortening its lifespan. If operation continues, the quality of the produced pure water declines, which in turn increases the burden on the purification column, shortening its lifespan as well.
Therefore, when using an ultrapure water system, the following aspects require attention.
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