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Spectrophotometric Determination of Nitrite in Curing Meat Samples Using Diazo-Coupling Reaction | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 11, Issue 2, 2006, Pages 183-186 | ||
| Author | ||
| Chinar M. Rashid | ||
| Abstract | ||
| A simple and sensitive spectrophotometric method for the determination of nitrite was described. Nitrite reacts with an acidified sulfanilamide to form a diazonium ion, which is subsequently coupled with orcinol in alkaline medium to form an intensely yellow-colored, stable and water soluble azo dye having maximum absorption at 427nm.The linear absorbance plot with concentration indicates that Beer's law obeyed over the range of 0.005-1.80μg/ml of nitrite, with a detection limit of 0.003μg/ml. The molar absorptivity and Sandell index were 4.36X104 l/mol.cm and 0.00105 μg/cm2, respectively. The optimum conditions affecting the colour intensity and interferences of the foreign ions were studied. The results of the proposed method for determination of nitrite in curing meat samples agreed with those obtained by the NED standard method. | ||
| Keywords | ||
| Nitrite; orcinol; Sulfanilamide; curing meat | ||
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