The researchers developed a new method to detect nitrite and nitrate in dairy products more effectively. They used a process involving water extraction, protein precipitation, and solid phase extraction. By using specific chemicals and equipment, they were able to accurately measure nitrite and nitrate levels in dairy products. The results showed that the method was simple, fast, and highly sensitive, with good accuracy in detecting these substances. This new method can help ensure the safety of dairy products by detecting harmful levels of nitrite and nitrate.