DETERMINATION OF PHOSPHORUS IN AQUEOUS-SOLUTION VIA FORMATION OF THE PHOSPHOANTIMONYLMOLYBDENUM BLUE COMPLEX - REEXAMINATION OF OPTIMUM CONDITIONS FOR THE ANALYSIS OF PHOSPHATE

被引：129

作者：

DRUMMOND, L ^{[1
]}

MAHER, W ^{[1
]}

机构：

[1] UNIV CANBERRA,WATER RES CTR,BELCONNEN,ACT 2616,AUSTRALIA

来源：

ANALYTICA CHIMICA ACTA | 1995年 / 302卷 / 01期

关键词：

PHOSPHORUS; PHOSPHOANTIMONYLMOLYBDIC ACID METHOD;

D O I：

10.1016/0003-2670(94)00429-P

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This paper describes an investigation of the conditions affecting the determination of phosphate using the reduced phosphoantimonylmolybdic acid method. The aim was to develop a determination method with faster kinetics than the original procedure of Murphy and Riley, for automation using how-injection analysis. Optimum colour formation was found to occur at [H+]/[MoO42-] ratios between 50-80 at all pH values tested (0.36-1.06). The maximum rate of formation occurs at a [H+]/[MoO42-] ratio of 70 within a pH range of 0.57-0.88 when an antimony concentration greater than 0.06 mM and ascorbic acid concentration greater than 0.009 M in the final solution are used. Full colour development occurs within 0.8-1 min. The ascorbic acid reagent was found to be stable for 30 days. The results of the study indicated that by suitable selection of reagent conditions, rapid chromophore development can be achieved.

引用

页码：69 / 74

页数：6

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