摘要
本文详细研究了乙基罗丹明Ｂ－磷钼杂多酸－ＰＶＡ超高灵敏显色反应，提出了高灵敏测量痕量磷的新的分光光度法。缔合物的最大吸收波长位于５８４ｎｍ处，其表观摩尔吸光系数为１．３×１０￣６Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。并研究了缔合物的组成和红外光谱。本法直接用于钢样及试剂中痕量磷的测定，获得满意的结果，检测下限达６×１０￣（－７）％。
A new super sensitive color system ofethyl rhodamine B(ERB )-molybdophos-phoric acid-PVA has been studied. The opti-munl conditions for the determination ofphosphorus are[ HNO_3]=0. 14mol/L,[MoO]=2. 0×10￣(-3)mol/L,[ERB￣-]=1.1×10￣(-4)mol/L. and 0. 12%PAV,The ion-as-sociate exhibits maximum absorption at584nm and at this wavelength, its apparentmolar absorptivity was found to be 1.3×10￣6L. mol￣(-1)cm￣(-1). Beer's law is obeyed in therange of 0 to 0.25μg/25mL for P(Ⅴ),Themolar ratio of P(Ⅴ) to ERB￣+ in the ion-asso-ciate was established to be 1:16 by molarratio method,The proposed method has beenused for the determination of trace phospho-rus in steel and some chemical reagents withsatisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第2期63-66,共4页
Chinese Journal of Analysis Laboratory
关键词
乙基罗丹明B
磷钼杂多酸
光度法
磷
Super sensitive color reac-tion,Ethyl rhodamine B,Heteropoly-molybdophosphoric acid
