摘要
文章提出了食用盐中亚硝酸盐的测定方法。食用盐中的亚硝酸盐在弱酸性条件下,与对α-氨基苯磺酸重氮化后,和N-1-盐酸萘已二胺偶合形成紫红色染料,在538nm的波长下,光度法测定。线性范围0mg/L～0.3mg/L,线性相关系数r=0.999x,检出限为0.14mg/kg的亚硝酸钠含量。
The analytic methods of nitrite in edible salt were described. In acidic solution,nitrite have diazo reacted with p - aminobenzene sulfonic acid, then coupling reacted with N - （ 1 - Naphthyl） -ethylenediamine dihydrochloride,the fuchsia dyestuff can be appeared. The content of nitrite was determined by spectrophotometry. The conditions are as follows： the wave length is 538mn, the linear range is between 0mg/L and 3 mg/L, r is 0.999x and the limit of detection is 0.14 mg/kg.
出处
《盐业与化工》
CAS
北大核心
2007年第4期23-25,共3页
Jounral of Salt and Chemical Industry
