摘要
在氨水介质中，Ｃｏ（Ⅱ）能催化二苯偶氮碳酰肼被溶解氧氧化而褪色。本文进一步考察了此方法的测定条件及二氨替吡啉甲烷萃取Ｃｏ（Ⅱ）的回收率，并应用该法成功地测定了原油及润滑油中的钴。钴的回收率９３．０％─９９．３％，摩尔吸收系数１．１×１０６Ｌ·ｍｏｌ（－１）·ｃｍ（－１），线性范围０．０５─０．４μｇ／２６ｍｌ，检测限０．０８μｇ／２６ｍｌ，相对标准偏差２．２％─４．４％。方法准确、灵敏、易行。
The method is based on the principle that Co(Ⅱ) in NH3·H2O medium can catalyze the decoloration reaction of diphenylcarbazone through oxidation by air[1]. We have applied this method successfully to determine trace cobalt in crude oil and lube oil. The recovery of Co(Ⅱ)is 93. 0%-99. 3 %. The molar absorptivity and linear range are respectively 1. 1 ×106 L·mol-1·cm-1 and 0.05-0. 4μg/26ml. The detection limit is 0. 08μg/26ml. This method has the advantages of accuracy,sensitivity and simplicity.
出处
《石油化工》
CAS
CSCD
北大核心
1996年第4期278-281,共4页
Petrochemical Technology
关键词
催化分光光度法
微量钴
重油
测定
atalytic spectrophotometry,micro cobalt,heavy oil
