In HPLC analysis, water is essential for use in preparing mobile phases and samples. If impurities are present in a mobile phase, however, they can increase background signals that can increase baseline noise, drift, or cause other phenomena, such as negative peaks or unknown peaks during gradient elution.

Application

Water is the reagent used in the largest volumes in Liquid chromatography and its purity is critical, especially in high sensitivity applications. These will require water for sample pre-treatment, such as solid phase extraction, and for the preparation of eluents, reagent blanks and standards.