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Abstract
In this study, the preservation of As(III) in model solutions and natural groundwater samples from four locations in Croatia was conducted. Model laboratory samples were spiked with As(III) and As(V), and different complexing agents. Solutions were analysed in intervals of 24, 48 h and during ten days after preparation. Model samples containing citric acid, sodium citrate, sodium oxalate and potassium sodium tartrate in combination with acetic acid, spiked with As(III)and As(V), showed good species preservation. As(III), in model samples, was preserved for 7 days with citric acid, and citric acid in combination with acetic acid, as well as with tartrate. As(III), in natural samples, was preserved for 6 to 12 days with potassium sodium tartrate, citric acid, and citric acid in combination with acetic acid and showed improvement, compared with unpreserved samples (oxidation in 3 days). The results showed that acetic acid alone was not successful in preserving As speciation. Good resolution of inorganic arsenic species was achieved using differential pulse anodic stripping voltammetry technique (DPASV). Since this technique is comparatively cheaper and more convenient to use than other available techniques it could become a method of choice for arsenic speciation in water.
Highlights
Arsenic participates in complex biological and chemical processes, and naturally occurs in the environment in different oxidation states and species that have different chemical behaviours and toxicities [1,2]
All measurements were done in duplicate, and the results presented are the mean values
Citric acid in combination with HAc is a suitable agent for stabilization during the storage of samples containing high concentrations of iron, and for the preservation of arsenic species for up to 7 days
Summary
Arsenic participates in complex biological and chemical processes, and naturally occurs in the environment (soil, air, water, etc.) in different oxidation states and species that have different chemical behaviours and toxicities [1,2]. Inorganic species are more toxic than organic arsenic compounds like monomethyl- and dimethyl arsenic, which are predominant in living organisms [3]. The reduced inorganic species, trivalent arsenic As(III), is approximately 60 times more toxic than oxidized, pentavalent arsenic As(V) [4,5]. Arsenic speciation analysis of environmental samples is necessary. The stability of sample plays a significant role in species content determination. Between sampling and laboratory analyses, changes in the species composition should be avoided. A suitable procedure for the preservation of the species should be implemented
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