Controlled-potential iodometric titration of nitrite. Application to the determination of nitrite in meat products.
A controlled-potential coulometric method using iodine as an intermediate has been devised for the determination of nitrite. Nitrite is reduced by iodide and the iodine formed is then reduced coulometrically. The reduction of nitrite in the pH range 0-6 has been studied and the optimum conditions for an accurate determination are stated. The time of analysis for a determination in the range 0.005-5 mg of nitrite is about 2-5 min and the error +/- 0.1%. The method is applied to the determination of nitrite in some meat products.
Karlsson
R
R
Department of Analytical Chemistry Chemical Center, University of Lund, S-220 07 Lund 7, Sweden.
Torstensson
L G
LG