Research on Key Influencing Factors of Determination of Nitrite in Foods
Objective:To detect nitrite in food by GB 5009.33-2016 second method spectrophotometry,and analyze the key factors affecting the test results.Method:The standard solution and the solution to be tested were measured under the same conditions,and the linear range of the standard curve was expanded.The detection process was divided into four steps,and the standard recovery test was carried out respectively.Combined with the standard electrode potential of the redox reaction,the key factors affecting the detection results were analyzed.Result:The potassium ferrocyanide solution may decompose to produce Fe3+ after a long time.Fe3+ can oxidize nitrite,resulting in low detection results,and other solutions are relatively stable.Conclusion:The spectrophotometric method in GB 5009.33-2016 is stable and reliable,and the stability of potassium ferrocyanide solution is the key factor affecting the test results.
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