Study on the rapid determination method of nitrite in food

A test paper was developed in order to explore a method for rapid detection of nitrite in food based on the chemical chromogenic reaction in this test. The test paper used medium speed quantitative filter paper as material and 1.2% sulfanilic acid solution mixed with 0.6% hydrochloric acid naphthalene ethylenediamine solution by volume ratio 1∶1 as a chromogenic agent.The test paper should be immersed in the agent by p H2.0 for 15 min and dried in 40°C by vacuum oven for 30 min.Compared with national standard method,the results showed that the test paper method has a lower cost and more simple to operate and easier to carry. Also it's suitable for field testing and could meet the requirements of qualitative and semi- quantitative analysis.