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含有瞵酸基的变色酸单偶氮衍生物如偶氮氯膦Ⅰ、兴多偶氮氯膦Ⅰ等均是铍的显色剂。本文报道铍与偶氮溴膦Ⅰ的显色反应。在pH5的六次甲基四胺缓冲溶液中,铍与偶氮溴膦Ⅰ形成1:1的稳定红紫色络合物。显色剂和络合物的最大吸收分别位于波长510和580nm处。络合物的表观摩尔吸光系数ε为7.8×10~3。铍的浓度在0-1.2μg/mL范围内遵循比尔定律。加入显色剂后,络合物在10分钟内显色完全,且至少可稳定24小时。共存离子的干扰可用EDTA消除。在本法选定的条件下,下列元素不干扰测定(单位微克,非最高限量):Al_2O_3(500)~*,Fe_2O_3(2000),CaO(1000),MgO(2000),TiO_2(100),Mn(100),Cu(50),Co(50),
Chromic acid monoazo derivatives containing 瞵 acid groups such as chlorophosphonazo Ⅰ chlorophosphonazo Ⅰ and so on are beryllium developer. This article reports the chromogenic reaction of beryllium with bromophosphonazo I. In pH 6 hexamethylenetetramine buffer solution, beryllium and brominated bromine Ⅰ form a stable 1: 1 magenta complex. The maximum absorption of the developer and complex is at wavelengths of 510 and 580 nm, respectively. The apparent molar absorptivity ε of the complex was 7.8 × 10 ~ 3. The beryllium concentration follows Bill’s law in the range of 0-1.2 μg / mL. After the addition of the developer, the complex developed completely within 10 minutes and was stable for at least 24 hours. Coexistence of ion interference can be eliminated with EDTA. Under the conditions selected in this Law, the following elements do not interfere with the determination (in micrograms and non-maximum): Al 2 O 3 500 ~ *, Fe 2 O 3 2000, CaO 1000, MgO 2000, TiO 2 100, Mn (100), Cu (50), Co (50),