Simultaneous Determination of Antimony(III) and Molybdenum(VI) by Adsorptive Stripping Voltammetry Using Quercetin as Complexing Agent

Abstract

A sensitive and selective voltammetric method for simultaneous determination of Sb(III) and Mo(VI) using Quercetin (Q) as complexing agent is described. Optimal conditions were found to be: pH 3.7, CQ=6.0 µmol L−1 and Eacc=−0.10 V. The LOD (3σ) for Sb(III) are 0.076 and 0.040 µg L−1, whereas for Mo(VI) are 0.086 and 0.048 µg L−1 with tacc of 60 and 120 s, respectively. The method was validated using synthetic sea water (ASTM D665) and was applied to the determination of Sb(III) and Mo(VI) in natural waters with satisfactory results.

Adsorptive anodic stripping voltammetric determination of antimony(III) on a glassy carbon electrode using rivastigmine as a new chemical receptor

“…These are summarized in Table 3. As can be seen from this table, the value of LOD is lower than most of the reported electrochemical methods [15,16,[21][22][23]26,[31][32][33]36,[38][39][40]43,45,49,52]. Moreover, the results of the interference studies showed that the selectivity of the proposed method is quite high.…”

“…Many voltammetric studies, including stripping methods for determination of antimony, have focused on the modification of the electrode surface or use of a chelating/complexing agent to increase the detection limit. With this aim, different complexing reagents such as catechol [33,44], chloranilic acid [34,36], morin [35], gallocyanine [37], pyrogallol red [38], pyrogallol [39,41,42], alizarin red S [40], 4-(2-thiazolylazo)-resorcinol [43], quercetin [45], and quercetin-5 -sulfonic acid [46] have been successfully used for determination of Sb(III) on a mercurybased electrode. Recently, carbon-based electrodes have attracted attention in electroanalytical studies as an attractive alternative to mercury electrodes in stripping analysis due to their many advantages.…”

“…Mercury-based electrodes have been widely preferred as the working electrode in antimony determination. This is due to the ability of mercury to form amalgams with a number of metals on the electrode surface and to enhance the analytical signal associated with stripping analysis [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][52][53][54]. Many voltammetric studies, including stripping methods for determination of antimony, have focused on the modification of the electrode surface or use of a chelating/complexing agent to increase the detection limit.…”

“…Furthermore, they are more portable than the aforementioned techniques . The stripping voltammetric techniques including anodic stripping voltammetry (ASV) [21][22][23][24][25][26][27][28][29][30][31] and adsorptive stripping voltammetry (AdSV), based on the interfacial accumulation and voltammetric determination of metal complexes [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], are those most commonly employed in the determination of antimony due to their lower detection limits. Mercury-based electrodes have been widely preferred as the working electrode in antimony determination.…”

A Versatilidade Do Eletrodo De Gota Pendente De Mercúrio Em Química Analítica – Uma Revisão Sobre Recentes Aplicações

“…A preocupação com este compartimento ambiental é significativa, devido aos possíveis riscos aos quais organismos aquáticos estão expostos. 33,34,[37][38][39][40][41][42][43] No mesmo sentido, alguns trabalhos também avaliaram a presença de metais em águas de torneira e água envasada. [44][45][46][47][48][49] Arab and Alshikh avaliaram a presença de Cd, Cu, Fe, Pb Zn, Se em amostras de águas de torneira de diferentes pontos da cidade de Jeddah na Arábia Saudita, durante um ano empregando voltametria de redissolução por pulso diferencial e HMDE como eletrodo de trabalho.…”