High-performance liquid chromatography (HPLC), formerly referred to as high-pressure liquid chromatography, is a technique in analytical chemistry used to separate, identify, and quantify specific components in mixtures. The mixtures can originate from food, chemicals, pharmaceuticals,biological, environmental and agriculture, etc., which have been dissolved into liquid solutions.

Ion chromatographs are mainly used for the analysis of anions and cations in samples, including surface water, drinking water, domestic sewage and atmospheric particulate matter. It is also widely used in food, health, petrochemical, water and geological fields.

Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption (drinking water), but water purification may also be carried out for a variety of other purposes, including medical, pharmacological, chemical, and industrial application.