Speciation of As(III) and As(V) in water samples by dispersive liquid-liquid microextraction separation and determination by graphite furnace atomic absorption spectrometry

Recent development in liquid phase microextraction for determination of trace level concentration of metals—A review

“…The main advantages of the method are good sample frequency and possibility of speciation of the trivalent and pentavalent inorganic forms of As and Sb. Liang et al [84] used the same methodology and reagent for the speciation of As(III) and As(V) in water samples. However, the detection limit of this method (36 ng L −1 ) was worse than the previous one (10 ng L −1 ).…”

Evaluation of the fate of arsenic-contaminated groundwater at different aquifers of Thar coalfield Pakistan

“…Moreover, it is necessary to develop sensitive and precise methods to quantify the iAs species. A number of separation and preconcentration methods were reported in the literature, solid phase extraction (Marahel et al 2011;Uluozlu et al 2010), gold nanoparticle loaded on activated carbon with bis(4-methoxysalicylaldehyde)-1,2-phenylenediamine as sorbent (Karimipour et al 2012), cloud point extraction, coprecipitation, ion exchange, and chromatography (Hirata and Toshimitsu 2007;Liang et al 2009). Among them, the cloud point extraction (CPE) technique was used for the extraction of As species-like arsenite (As 3+ ) and arsenate (As 5+ ), based on the phase separation of nonionic surfactants in aqueous media (Bezerra et al 2005;Sarı and Tuzen 2010).…”

Separation and Preconcentration by Dispersive Liquid–Liquid Microextraction Procedure: Recent Applications

“…For determination of total antimony, L-cysteine up to 2% concentration was added (for Sb(V) reduction). In a similar way, a method for the determination of inorganic arsenic species (As(III) and As(V)) was developed by Liang et al [131]. In the pH range of 3-5, As(III) complexes with ammonium pyrrolidinedithiocarbamate (APDC) and then can be extracted into carbon tetrachloride droplets formed by injecting the binary solution of carbon tetrachloride and methanol into the sample solution.…”