Le sulfate de cuivre bleu cristallisé est utilisé pour le traitement de l'eau agricole et les engrais.

Copper sulfate (CuSO4) is an inorganic compound widely used in industrial production and scientific research. The common form of this compound is copper sulfate pentahydrate (CuSO4 · 5H2O), which is a blue crystal commonly known as blue alum. This substance will lose its crystalline water under dry conditions and turn into anhydrous copper sulfate in the form of white or off white powder. The preparation of copper sulfate is usually achieved through the reaction of concentrated sulfuric acid and copper, or by processing a mixture of copper ore and sulfuric acid.
In industry, copper sulfate is an important chemical raw material widely used in pesticides, animal and plant growth regulators, feed additives, and as a medium in electroplating and printing and dyeing industries. It also plays a role in the field of water treatment, used for sterilization, algae control, and anti-corrosion. Copper sulfate is both a fertilizer and a widely used fungicide. Bordeaux mixture, copper soap solution, and copper ammonium preparation are made by mixing copper sulfate with lime milk, soap, and ammonium bicarbonate.

Applications in the field of agriculture
Copper sulfate plays an important role in the agricultural field, especially as a raw material for pesticides. It has significant effects on preventing and treating various plant diseases, such as those caused by fungi and bacteria. Copper sulfate can be used to prepare Bordeaux mixture, a long-standing fungicide widely used in vineyards and orchards to prevent the invasion of downy mildew and other fungal diseases. In addition, as a source of trace element copper, the addition of copper sulfate in animal feed helps to improve the growth rate and overall health of livestock. However, the dosage and frequency of copper sulfate in agricultural use must be strictly controlled to avoid heavy metal pollution of soil and water sources, protect the environment and human health.  
water treatment
The application of copper sulfate in the field of water treatment is mainly reflected in its functions as a fungicide and algae control agent. In swimming pools and drinking water treatment systems, an appropriate amount of copper sulfate can effectively inhibit the growth of algae, reduce the bacterial and viral content in the water, and improve the cleanliness and safety of water quality. Its use requires precise concentration control to avoid potential risks to human health. Copper sulfate is also used in industrial circulating water systems to prevent the formation of biofilms and maintain efficient system operation. However, the increasing awareness of environmental protection requires the search for more environmentally friendly alternatives to reduce negative impacts on the environment..