Pollution caused by industrial plants is due to toxic and lethal chemicals coming out of these places. Unfortunately, many industrial plants dispose of their waste into the soil and water without any treatment. In any case, these wastes reach the water and create pollution.

Nitrite is an intermediate stage of the nitrogen cycle. Nitrite is formed by the biodegradation of proteinaceous substances in water. Even the lowest nitrite level in water is indicative of organic contamination. If the ammonia level is high in surface waters, bacteria and other living organisms become active and nitrite is formed with the increasing temperature.

Ion chromotography (IC) method is also used to determine the presence and amount of nitrite in water. This is a method of separating and detecting ions using ion exchange resins. Anion exchange resins are used to separate the anions, while cation exchange resins are used to separate the anions. The ions contained in the content of a solid are displaced in a certain equilibrium with the charged ions of the same type in the solution to which this solid is in contact.

Nitrite content determination studies are carried out in the authorized laboratories by ion chromatography using chemical tests. A few standards considered in these analyzes are:

• TS 6183 Fruit, vegetables and products - Determination of nitrite and nitrate - Molecular absorption spectrometric method
• TS EN 12014-1 Foodstuffs - Determination of nitrate and / or nitrite content - Part 1: General requirements
• TS EN 12014-2 Foodstuffs - Determination of nitrate and / or nitrite content - Part 2: Determination of nitrate content in vegetable and vegetable products by HPLC / IC method
• TS EN 12014-4 Foodstuffs - Determination of nitrate and / or nitrite content - Part 4: Ion exchange chromatographic (IC) method for the determination of nitrate and nitrite content in meat products