胶束增敏催化分光光度法测定火腿肠中痕量亚硝酸根

Physical Testing and Chemical Analysis(Part B:Chemical Analysis)(2013)

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Abstract
在硫酸介质和表面活性剂十二烷基硫酸钠(SDS)存在下,亚硝酸根对溴酸钾氧化亚甲基蓝的褪色反应具有催化作用,并且由于添加了SDS,体系的灵敏度明显提高,据此提出了测定痕量亚硝酸根的方法。亚硝酸根的质量浓度在0.02~1.0 mg·L~(-1)范围内与△A呈线性关系,方法的检出限(3s/k)为0.074 mg·L~(-1)。方法用于火腿肠中痕量亚硝酸根的测定,并做回收试验,测得回收率在98.8%~103%之间,测定值的相对标准偏差(n=5)在1.9%~2.4%之间。
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Key words
Methylene blue,Potassium bromide,Nitrite,Catalytic spectrophotometry,Micelle-sensitization
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