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Impurities in chemical reagents include organic impurities, inorganic impurities, moisture, and metal ions.

1. Organic impurities

Organic impurities are compounds composed of carbon and hydrogen, such as alcohols, ketones, aldehydes, fatty acids, hydrocarbons, adenines, pigments, impurities, etc. During the manufacturing and storage of chemical reagents, these organic compounds may enter the reagents. Organic impurities may affect the purity and stability of the reagent, resulting in adverse reactions during use.


2. inorganic impurities

Inorganic impurities are compounds without carbon-carbon bonds, such as chlorine, sulfur, iron, lead, chromium, copper, zinc, etc. These inorganic impurities usually originate from the raw materials used to make the reagents or from contamination during the preparation of the reagents. Inorganic impurities may cause instability and inaccuracy of reagent properties.


3. Moisture

Water is one of the most common impurities in chemical reagents. Moisture usually results from improper handling of the raw materials or preparations used to make the reagents. Excessive water content may affect the properties, stability and purity of the reagent.


4. Metal ions

Metal ions are metal atoms with positive charge, such as iron, copper, lead, nickel, zinc, aluminum, etc. These metal ions may enter the reagent during the manufacturing or storage of chemical reagents. The presence of metal ions may affect the stability and reactivity of the reagent.


1. particulate matter: including sediment, rust, algae, suspended matter and other visible particulate impurities, particulate matter is the main source of turbidity, chroma, odor.

2. colloidal substances: Colloidal substances are larger than ionic substances and smaller than particulate matter. A colloid is a collection of many molecules and ions.

3. ionic substances: including cations and anions. Ionic substances are usually soluble in water and can be removed by ion exchange or desalting.

4. non-reactive dissolved gas: refers to such as nitrogen, which does not react with aquatic biochemistry, producing compounds that introduce ionic pollutants into the water and affect the PH value of the water.

5. reactive dissolved gases: the common dissolved gases in natural water are oxygen, carbon dioxide, and sometimes hydrogen sulfide and ammonia. Most of these gases dissolved in water have a corrosive effect on metals, which is an important factor causing metal corrosion in water systems.