紫外光度法测定亚硝酸根的研究  

Study on the Determination of Nitrite by New UV Spectrophotometric Method

作　　者：王明[1] 陈兴伟[1] 

机构地区：[1]四川省天然气化工研究院,四川成都610212

出　　处：《化学世界》2000年第2期98-100,共3页Chemical World

摘　　要：研究了在盐酸介质中，亚硝酸根与亚氨基二乙酸在溴化钾的催化下发生亚硝化反应，其亚硝化产物在近紫外区有吸收峰，最大吸收波长为３５０ ｎｍ ，亚硝酸根在０～２５ μｇ／２５ ｍ Ｌ范围内符合比耳定律，其表观摩尔吸光系数为４．５×１０４ Ｌ／ｍ ｏｌ·ｃｍ 。提出了测定亚硝酸根的新方法，用于肉制品中微量亚硝酸根的测定，结果满意。A new UV spectrophotometric method for the determination of trace nitrite was studied. This is based on the nitrosation reaction of iminodiacetic acid with nitrite in hydrochloric acid medium and in the presence of KBr. The product was measured at 350 nm, Beer's law is obeyed over the concentration range of 0～25 μg/25 mL NO - 2. The apparent molar absorptivity is 4.5×10 4 L/mol·cm. It has been used for the determination of trace nitrite in pork products with satisfactory results.

关 键 词：紫外光度法 亚硝酸根 亚硝化反应 

分 类 号：O613.61[理学—无机化学] O657.32[理学—化学]