A new method for highly efficient separation and determination of arsenic species in natural water using silica modified with polyamines

• Published in: Analytica chimica acta Vol. 1178; p. 338824
• Main Authors: Losev, Vladimir N., Didukh-Shadrina, Svetlana L., Orobyeva, Anastasia S., Metelitsa, Sergey I., Borodina, Elena V., Ondar, Urana V., Nesterenko, Pavel N., Maznyak, Natalia V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.09.2021
• Subjects: Arsenic speciation; ICP-MS; ICP-OES; Modified silica; Pollution monitoring; Polyamines; Arsenic speciation; Pollution monitoring; ICP-MS; Polyamines; ICP-OES; Modified silica
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2021.338824

A simple and highly efficient method for the determination of highly toxic arsenic species using non-covalently aminated silica is proposed. The polyamines including poly(hexamethyleneguanidine), poly(4,9-dioxadodecane-1,12-guanidine), hexadimethrine, and poly(diallyldimethylammonium) were tested as silica modifiers. The prepared adsorbents allow effective preconcentration of anionic species of arsenic from aqueous solutions. It was found that As(V) can be quantitatively extracted from solutions at pH 4.5–7.0 by the anion exchange mechanism in less than 5 min, while neutral at this pH As(III) was not adsorbed at these conditions. A reaction with 2,3-dimercapto-1-propanesulphonic acid, which resulted in the formation of the negatively charged complex of As(III) with adsorbents was used for its quantitative extraction from solutions with a pH of 3.5–6.5. A system of two cartridges filled with poly(diallyldimethylammonium) modified silica and the on-line reaction of As(III) with 2,3-dimercapto-1-propanesulphonic acid proceeding between the cartridges was used for separate preconcentration and determination of As(V) and As(III) at pH 5. The proposed method was used for four-year monitoring of natural water pollution by arsenic in the area of residence of the indigenous peoples of Tyva Republic (Russia). [Display omitted] •Silica modified with polyamines was used for separation of As(V)/As(III) at pH 5.•As(III) was extracted as a complex with 2,3-dimercapto-1-propanesulphonic acid.•Quantitative extraction of As(III) was attained at the ratio As:DMPS more than 1:10.•The preconcentration factor for As(V) reached 300, for As(III) 400.•Sequentially connected cartridges were proposed for arsenic speciation and monitoring of natural water.