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近年来报导了一些高灵敏的钴试剂,如5-Cl-PADAB、PADAT、5-Br-PADAP等,都已广泛用于多种物料中痕量钴的测定。对于样品中0.1%以上钴的测定,常用的亚硝基-R-盐法(ε_(570)=1.5×10~4)和α-亚硝基-β-萘酚法(ε_(317)=2.65×10~4)均嫌其灵敏度不够。作者根据文献报导为基础,合成了3-[(5-溴-2-吡啶)偶氮]-2,6-二氨基吡啶(5-Br-PADAPy)试剂,它对钴有中等灵敏度(ε_(615)=3.91×10~4),适宜用于钢铁、矿石等物料中万分之一以上至百分之一以下的钴的测定。与PADAT等不同,5-Br-PADAPy只含有单一的分析功能团,其选择性较好,它与钴形成的络合物在酸性介质中不分解。方法快速,结果
In recent years, some highly sensitive cobalt reagents, such as 5-Cl-PADAB, PADAT and 5-Br-PADAP, have been reported and used in the determination of trace cobalt in various materials. For the determination of more than 0.1% cobalt in the samples, the common nitroso-R-salt method (ε_ (570) = 1.5 × 10 ~ 4) and α-nitroso-β- 2.65 × 10 ~ 4) are not enough sensitivity. Based on the literature reports, the authors synthesized 5-Br-PADAPy reagent with 3 - [(5-bromo-2-pyridyl) azo] -2,6-diaminopyridine with moderate sensitivity to cobalt 615) = 3.91 × 10 ~ 4), suitable for the determination of cobalt in steel, ore and other materials in more than one ten thousandth to less than one percent. Unlike PADAT, 5-Br-PADAPy contains only a single analytic functional group with good selectivity. The complex formed with cobalt does not decompose in acid medium. Fast method, the result