摘要
本文研究了丁基罗丹明 B-磷钼杂多酸-PVA_124超高灵敏显色反应,提出了测定痕量磷新的分光光度法,缔合物的最大吸收波长位于588nm 处,表观摩尔吸光系数ε值为1.1×10~6L·mol^(-1)·cm,研究了缔合物的组成比和红外光谱,并初步讨论了反应机理,本法直接用于钢、试剂和水样的分析,结果较为满意,测定下限分别可达4ppb(10ml 水)和2×10^(-6)％(1g 试剂)。
A now superhigh sensitive colour system of butyl rhodamine B (BRB)-molybdop- hosphoric acid-PVA-124 has been studied.The optimum conditions for the determination of phosphorus are [HNO_3]=0.15mol/L,[MoO_4^(2-)]=1.7×10^(-3)mol/L,[BRB^+]=6.4×10^(-6) mol/L and 0.12% PVA-124.The ion-associate exhibits maximum absorptivity at 588 nm.At the working wavelength of 590 nm,its apparent molar absorptivity was found to be 1.1× 10~6L·mol^(-1).cm^(-1),Beer's law is obeyed in the range of 0 to 0.26μg/25ml for P(V).The molar ratio of P(V) to BRB^+ in ion-associate was established to be 1:14 by molar ratio method and molar absorptivity contrast method,and the reaction mechanism has been discu- ssed.The complex is supposed to be a complicated ion-association complex with the possible formula {BRB_4·H_3[P(Mo_2O_7)_6]}·5[BRB_2·MoO_4].The proposed method has been used for the determination of trace phosphorus in steel,in some chemical reagents and in water with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1991年第4期413-418,共6页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金
关键词
磷
测定
高超灵敏
显色反应
杂多酸
Supcrhigh sensitive colour reaction
Buthyl rhodamine B
Molybdophoosphoric acid
