Chemical Speciation of Antimony(III and V) in Water by Adsorptive Cathodic Stripping Voltammetry Using the 4‐(2‐Thiazolylazo) – Resorcinol

Abstract

A simple adsorptive cathodic stripping voltammetry method has been developed for antimony (III and V) speciation using 4-(2-thiazolylazo) -resorcinol (TAR). The methodology involves controlled preconcentration at pH 5, during which antimony(III) -TAR complex is adsorbed onto a hanging mercury drop electrode followed by measuring the cathodic peak current (I p,c ) at À0.39 V versus Ag/AgCl electrode. The plot of I p,c versus antimony(III) concentration was linear in the range 1.35 10 À9 -9.53 10 À8 mol L À1.The LOD and LOQ for Sb(III) were found 4.06 10 À10 and 1.35 10 À9 mol L À1, respectively. Antimony(V) species after reduction to antimony(III) with Na 2 SO 3 were also determined. Analysis of antimony in environment water samples was applied satisfactorily.

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.…”