摘要
以水体积分数80％的油／水型（十二烷基硫酸钠-正丁醇-正庚烷-水）微乳液为介质，2-（5-溴-吡啶偶氮）-5-二乙氨基苯酚（5-Br-PADAP）为显色剂，分光光度法测定原油和润滑油中钴，并对测定条件进行考察。结果表明：络合物最大吸收峰位于560nm处；在25mL溶液中，钴含量在0～20μg范围内服从比尔定律，其表观摩尔吸收系数ε560=8．48×10^4L·mol^-1·cm^-1；采用柠檬酸三钠和硫脲作为联合掩蔽剂可消除其它离子的干扰。方法用于测定辽河原油和锦减四线油中钴，加标回收率分别为98．9％～104．6％和95．4％～102．6％，其相对标准偏差分别为1．5％和2．7％。
With oil- 80% H2O（O/80% W） microemulsion （SDS- n-C4HgOH- n-C7H16- H2O） as medium, 2- （5-bromo-pyridylazo）-5-diethylaminophenol （5-Br-PADAP） as chromogenic reagent, the determination of cobalt（H） in crude oils and lubricating oils was achieved by spectrophotometry,and the determination conditions were studied. The results showed that the maximum absorption wavelength of the complex formed by Co（U） with 5-Br-PADAP was located at 560 nm. The apparent molar absorptivity was 8.48 × 10^4 L·mool^- 1· cm^- 1. Beer＇ s law was obeyed in the concentration range of 0 - 20μg/25 mL for cobalt. Other interference ions were eliminated by soldium citrate and sulfourea. Co^2 ＋ in Liaohe crude oil and Jiansixian （Jinzhou） were determined with relative standard deviation of 1.5 % and 2.7 %. The recovery was 98.9 % - 104.6 % and 95.4 % - 102.6 %, respectively.
出处
《冶金分析》
CAS
CSCD
北大核心
2006年第2期79-81,共3页
Metallurgical Analysis
关键词
微乳液
5-BR-PADAP
原油
润滑油
钴
分光光度法
microemulsion
2- （ 5-bromo-pyridylazo）-5-diethylaminophenol
crude oil
lubricating oil
cobalt（Ⅱ）
spect rophotometry
