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Chemicals and Solvents

Chemicals and Solvents

Liquid Purity: How HPLC Water Ensures Precise Lab Results

In the world of laboratory research, precision is everything. Every detail matters, from the quality of the reagents to the cleanliness of the equipment. And when it comes to liquid chromatography (LC), one of the most important factors affecting the accuracy of results is the purity of the water used.

What is HPLC?

High-performance liquid chromatography (HPLC) is a technique used to separate and quantify compounds in a liquid sample. It is a powerful tool that is used in a wide variety of applications, including drug discovery, environmental testing, and food analysis.

The success of HPLC depends on the use of high-purity water. This is because water is the mobile phase, which means that it is the liquid that carries the sample through the column. Any impurities in the water can interfere with the separation of the compounds, leading to inaccurate results.

The level of purity required for  HPLC water varies depending on the application. However, in general, HPLC water should have a low ionic content, low organic content, and low particulate matter.

There are a number of methods used to purify water for HPLC. The most common methods include:

  • Deionization: This process removes ions from water by passing it through a resin bed.
  • Reverse osmosis: This process removes ions and other impurities from water by forcing it through a semi-permeable membrane.
  • Distillation: This process vaporizes water and then condenses the vapor, leaving behind impurities.
  • Ultrafiltration: This process removes particles from water by passing it through a membrane with a very small pore size.

The choice of purification method depends on the specific requirements of the application. For example, reverse osmosis is often used to remove ions from water, while distillation is often used to remove organics.

Once the water has been purified, it is important to store it in a clean, sealed container to prevent contamination.

The use of HPLC water is essential for ensuring the accuracy of LC results. By using high-purity water, laboratories can be confident that their results are reliable and reproducible.

In addition to the purity of the water, there are other factors that can affect the accuracy of HPLC results. These include:

  • The cleanliness of the equipment
  • The temperature of the water
  • The flow rate of the water
  • The type of column used
  • The mobile phase composition

It is important to carefully control all of these factors to ensure the accuracy of results.

The use of HPLC water is just one of the many steps that laboratories can take to ensure the accuracy of their results. By following good laboratory practices and using high-quality reagents and equipment, laboratories can produce reliable data that can be used to make informed decisions.

Here are some additional tips for ensuring the purity of HPLC water:

  • Use a water purification system that is designed for HPLC applications.
  • Change the water filter cartridges regularly.
  • Store the water in a clean, sealed container.
  • Purge the system with HPLC water before each use.
  • Monitor the water quality regularly.


In the world of high-performance liquid chromatography (HPLC), precision is non-negotiable. The accuracy of results can have profound consequences in various fields, from pharmaceutical development to environmental protection. While it may seem inconspicuous, the purity of the water used as the mobile phase in HPLC is a critical factor that can make or break the reliability of your analyses.

High-purity water, or HPLC water, is the unsung hero in the quest for precise lab results. Its low levels of ionic and organic contaminants, minimal particulate matter, consistency, and reduced baseline noise are essential attributes that ensure the accuracy and reliability of HPLC experiments. When choosing HPLC water, laboratories must consider their specific analytical needs and opt for the appropriate level of purity to achieve the best results.

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