Ultrapure water for laboratories that meets quality standards

Conductivity

Standard: Conductivity is less than 0.1 µS/cm. For high-demand application scenarios, it may require lower values.

Reason: Conductivity reflects the ion concentration in water. Lower conductivity indicates that there are very few dissolved solids in the water.

Total organic carbon

Standard: TOC value is less than 5 ppb (micrograms per liter). Some high-end laboratories may require less than 1 ppb.

Reason: TOC value is used to evaluate the content of organic pollutants in water. Too high TOC will affect the accuracy of experimental results.

Microbial content

Standard: The total number of bacteria should be less than 1 CFU/mL (colony forming unit per milliliter), and there should be no pathogens such as E. coli.

Reason: Ensure that the water is microbially clean to prevent contamination during the experiment.

pH value

Standard: pH value should be between 5.5 and 7.0.

Reason: Ensure that the acidity and alkalinity of water are suitable for various experimental requirements and avoid affecting reagents or samples.

Dissolved oxygen (DO)

Standard: Usually there is no strict standard for dissolved oxygen, but it should be controlled within a reasonable range (usually 0-8 mg/L).

Reason: High concentrations of dissolved oxygen may affect some chemical reactions and biological experiments.

Heavy metal ions

Standard: Heavy metals such as lead, mercury, cadmium, etc. should be below the detection limit (generally less than 1 ppb).

Reason: The presence of heavy metals will interfere with biological experiments and chemical analysis.

Silicon content

Standard: Silicon content is less than 1 ppb.

Reason: The presence of silicon may interfere with some analytical methods, especially in semiconductor and optical applications.

Particles

Standard: The number of particles in water should be less than 0.1 µm. The number of particles should be very small (such as less than 1 particle per liter).

Reason: Reducing particulate matter can improve the repeatability and accuracy of experiments.

Functional requirements of laboratory ultrapure water production equipment:

Equipped with reverse osmosis device: preliminary removal of salt and organic matter in water.

Equipped with deionization device: further removal of ionic impurities.

Equipped with ultraviolet disinfector: eliminate microorganisms in water.

Equipped with precision filter: remove tiny particles.

Equipped with online monitoring system: real-time monitoring of water quality parameters such as conductivity and TOC.

The quality standards of laboratory ultrapure water are the key to ensuring the reliability of experimental results. These standards cover many aspects such as chemical composition, biological contamination, and physical properties of water. By using efficient ultrapure water filtration equipment and strict quality control, ultrapure water that meets laboratory needs can be obtained.