摘要
铕与ＤＢＭＣＡ在酸性介质阿拉伯树胶存在下有灵敏的显色反应，在６４８ｕｍ处的摩尔吸光率为１．８５×１０５Ｌ／ｍｏｌ·ｃｍ。在１．２ｍｏｌ／Ｌ盐酸的２７％乙醇溶液中，可用草酸－焦磷酸钠混合液掩蔽５０倍量的钇而测定铕，其表观摩尔吸光率在６３０ｕｍ处为８．０２×１０４Ｌ／ｍｏｌ·ｃｍ，用此方法测定了红色荧光粉中少量铕，获得满意的结果。
Europium gives a sensitive reaction with DBMCA in acidic medium in the presence of arabic gum with a molar absorptivity of 1.85 × 105L / mol. cm at 648urn. In 1.2 mol/ L hydrochloric acid-27% ethanol solution, europium can be determined in the presence of 50-fold amounts of yttrium when the latter is masked by a mixture of oxalic acid and sodium pyrophosphate. The apparent molar absorptivity of europium at 630urn is 8.02 ×104L/ mol. cm. A method is proposed for the spectrophotometric determination of europium in red phosphor. The results of sample analysis obtained are satisfactory.
出处
《华东师范大学学报（自然科学版）》
CSCD
1996年第2期72-76,共5页
Journal of East China Normal University(Natural Science)
关键词
铕
钇
DBMCA
荧光粉
分光光度法
Europium yttrium dibromo-p-methyl-carboxyarsenazo (DBMCA) red phosphor spectrophotometry
