摘要
本文研究了La(Ⅲ)与甲基百里酚蓝和溴化十六烷基吡啶在pH7.8—11.0的NH_4OH-NH_4Cl介质中生成紫色络合物的显色反应,λ_(max)=628nm,ε=8.1×10~4,La量在0—90μg/25ml范围内遵循比尔定律,烧结物中一些常见的离子不干扰测定。本法用于烧结物中游离氧化镧的测定,结果满意。
Lanthanum reacts with methylthymol blue (MTB) and cetylpyridinium bromide (CPB) in a NH4OH-NH4Cl buffer of pH 8 to form a complex with maximum absorption at 628nm, the molar absorptivity being 8.1×104.The composition of the complex is 1:2:4 (La:MTB:CPB). Beer's law is obeyed in the range 0-90μg La/25ml. The complex is stable at least 12h. The method has been applied to the determination of uncombined lanthana in lanthanum titanate sinters with satisfactory results.
出处
《岩矿测试》
CAS
CSCD
北大核心
1990年第2期119-121,共3页
Rock and Mineral Analysis
关键词
钛酸镧
烧结物
氧化镧
显色反应
spectrophotometry
lanthanum complex
uncombined lanthana determination
methylthymol blue
