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以苯基萤光酮(PF)为代表的2,3,7-三羟基9-取代基萤光酮是一类高灵敏的显色剂,尤其当体系中引入表面活性剂后,改善了实验条件,提高了显色反应的灵敏度和方法的选择性,使其在光度分析中得到较为广泛的应用.1978年,有人在PF的4,5位上引入2个溴原子形成4,5-二溴苯基萤光酮(BrPF)和在9取代基邻位上引入硝基形成邻硝基萤光酮(ONPF),由于溴和硝基的强吸电子作用,BrPF和ONPF的分析性能要比PF更好,这些年来实践已证明,并引起了人们广泛的兴趣. 本文在合成了4,5-二溴邻硝基苯基萤光酮(BrONPF)后,应用于测定微量钽、铌、钨、和钛,
The 2,3,7-trihydroxy 9-substituent fluorone, represented by phenylfluorone (PF), is a highly sensitive developer, especially when the surfactant is introduced into the system to improve the performance of the experiment Conditions to improve the sensitivity of the chromogenic reaction and the selectivity of the method to make it more widely used in photometric analysis.In 1978, PF was introduced at the 4, 5 two bromine atoms to form 4,5-bis Bromofluorophenyl Bromide (BrPF) and the introduction of a nitro group ortho to the 9 substituent to form an o-nitrophenylfluorone (ONPF). The analytical performance of BrPF and ONPF due to the strong electron-withdrawing effect of bromine and nitro PF is better and practice has been proved for a long time and has aroused people’s widespread interest.In this paper, after the synthesis of BrONPF, it has been applied to the determination of trace amounts of tantalum, niobium and tungsten , And titanium,