摘要
以含水量98．0％的O／W型微乳液为介质，以水杨基荧光酮为显色剂，在混合磷酸盐作用下，利用分光光度法测定油样中的微量铜。络合物的最大吸收波长位于568nm处。铜含量在0～10μg／25mL范围内服从比尔定律，其表观摩尔吸光系数为ε568=8．18×10^4L／（mol·cm）。采用氟化钠、柠檬酸和三乙醇胺作为联合掩蔽剂，对干扰较大的金属离子进行掩蔽。采用该方法测定了减四线油（锦州）和煤焦油（内蒙）中铜（Ⅱ）的含量，其相对标准偏差RSD分别为1．25％和1．67％，平均加标回收率分别为100．28％和100．53％。结果证明，该方法具有灵敏度较高、准确性和选择性好、操作简便快捷的优点。
Trace amount Cu （Ⅱ） in oil was determined by spectrophotometry in O/W microemulsion medium containing 98.0% water, using salcylfluorone as colouring reagent. The absorption peak of the complex compound is at 568nm. Beefs law is obeyed over the range of 0-10μg/25mL. The apparent molar absorption coefficient is 8.18）〈 10^4L/（mol · cm）. The interference of metal ions was masked by combined masking agents （sodium fluoride, citric acid and antriethanolamine）. Contents of Cu （ Ⅱ ） in Jian sixian oil of Jinzhou and coal tar of Inner Mongolia were determined using this method, the RSD＇s were 1.25% and 1.67%, the average recoveries of standard addition were 100. 28% and 100. 53%, respectively. The method has the advanges of higher sensitivity, and good accuracy and selectivity.
出处
《分析仪器》
CAS
2007年第4期42-44,共3页
Analytical Instrumentation
