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Abstract:

A simple and robust on-line sequential injection system based on solid phase extraction (SPE) coupled to a flow injection hydride generation atomic absorption spectrometer (FI-HGAAS) with a heated quartz tube atomizer (QTA) was developed and optimized for the determination of As(III) in groundwater without any kind of sample pretreatment. The method was based on the selective retention of inorganic As(V) that was carried out by passing the filtered original sample through a cartridge containing a chloride-form strong anion exchanger. Thus the most toxic form, inorganic As(III), was determined fast and directly by AsH3 generation using 3.5molL-1 HCl as carrier solution and 0.35% (m/v) NaBH4 in 0.025% NaOH as the reductant. Since the uptake of As(V) should be interfered by several anions of natural occurrence in waters, the effect of Cl-, SO4 2-, NO3 -, HPO4 2-, HCO3 - on retention was evaluated and discussed. The total soluble inorganic arsenic concentration was determined on aliquots of filtered samples acidified with concentrated HCl and pre-reduced with 5% KI-5% C6H8O6 solution. The concentration of As(V) was calculated by difference between the total soluble inorganic arsenic and As(III) concentrations. Detection limits (LODs) of 0.5μgL-1 and 0.6μgL-1 for As(III) and inorganic total As, respectively, were obtained for a 500μL sample volume. The obtained limits of detection allowed testing the water quality according to the national and international regulations. The analytical recovery for water samples spiked with As(III) ranged between 98% and 106%. The sampling throughput for As(III) determination was 60samplesh-1. The device for groundwater sampling was especially designed for the authors. Metallic components were avoided and the contact between the sample and the atmospheric oxygen was carried to a minimum. On-field arsenic species separation was performed through the employ of a serial connection of membrane filters and anion-exchange cartridges. Advantages derived from this approach were evaluated. HPLC-ICPMS was employed to study the consistency of the analytical results. © 2011 Elsevier B.V.

Registro:

Documento: Artículo
Título:Determination of As(III) and total inorganic As in water samples using an on-line solid phase extraction and flow injection hydride generation atomic absorption spectrometry
Autor:Sigrist, M.; Albertengo, A.; Beldoménico, H.; Tudino, M.
Filiación:Laboratorio Central, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2654-Piso 6, (3000) Santa Fe, Argentina
Laboratorio de Análisis de Trazas, Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Pabellón II, Ciudad Universitaria (1428), Buenos Aires, Argentina
Palabras clave:AAS; Arsenic speciation; Flow injection; Hydride generation; On-line separation; AAS; Arsenic speciation; Flow injection; Hydride generation; On-line separation; Absorption spectroscopy; Arsenic; Atomic absorption spectrometry; Chlorine compounds; Effluent treatment; Groundwater; Hydrochloric acid; Inductively coupled plasma mass spectrometry; Mass spectrometers; Negative ions; Optimization; Oxygen; Potassium iodide; Projectiles; Quartz; Water absorption; Water injection; Water pollution; Water quality; Extraction; arsenic; bicarbonate; chloride; ground water; hydrochloric acid; nitrate; oxygen; sodium borohydride; sodium hydroxide; sulfate; arsenic; bicarbonate; chloride; extraction method; groundwater resource; hydrochloric acid; inorganic compound; ion exchange; nitrate; speciation (chemistry); spectrometry; sulfate; water quality; acidification; anion exchange; article; atomic absorption spectrometry; flow injection analysis; high performance liquid chromatography; mass spectrometry; pH; solid phase extraction; water analysis; water pollutant; water quality; Arsenic; Arsenicals; Equipment Design; Limit of Detection; Solid Phase Extraction; Spectrophotometry, Atomic; Water; Water Supply
Año:2011
Volumen:188
Número:1-3
Página de inicio:311
Página de fin:318
DOI: http://dx.doi.org/10.1016/j.jhazmat.2011.01.126
Título revista:Journal of Hazardous Materials
Título revista abreviado:J. Hazard. Mater.
ISSN:03043894
CODEN:JHMAD
CAS:arsenic, 7440-38-2; bicarbonate, 144-55-8, 71-52-3; chloride, 16887-00-6; hydrochloric acid, 7647-01-0; nitrate, 14797-55-8; oxygen, 7782-44-7; sodium borohydride, 16940-66-2; sodium hydroxide, 1310-73-2; sulfate, 14808-79-8; Arsenic, 7440-38-2; Arsenicals; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03043894_v188_n1-3_p311_Sigrist

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Citas:

---------- APA ----------
Sigrist, M., Albertengo, A., Beldoménico, H. & Tudino, M. (2011) . Determination of As(III) and total inorganic As in water samples using an on-line solid phase extraction and flow injection hydride generation atomic absorption spectrometry. Journal of Hazardous Materials, 188(1-3), 311-318.
http://dx.doi.org/10.1016/j.jhazmat.2011.01.126
---------- CHICAGO ----------
Sigrist, M., Albertengo, A., Beldoménico, H., Tudino, M. "Determination of As(III) and total inorganic As in water samples using an on-line solid phase extraction and flow injection hydride generation atomic absorption spectrometry" . Journal of Hazardous Materials 188, no. 1-3 (2011) : 311-318.
http://dx.doi.org/10.1016/j.jhazmat.2011.01.126
---------- MLA ----------
Sigrist, M., Albertengo, A., Beldoménico, H., Tudino, M. "Determination of As(III) and total inorganic As in water samples using an on-line solid phase extraction and flow injection hydride generation atomic absorption spectrometry" . Journal of Hazardous Materials, vol. 188, no. 1-3, 2011, pp. 311-318.
http://dx.doi.org/10.1016/j.jhazmat.2011.01.126
---------- VANCOUVER ----------
Sigrist, M., Albertengo, A., Beldoménico, H., Tudino, M. Determination of As(III) and total inorganic As in water samples using an on-line solid phase extraction and flow injection hydride generation atomic absorption spectrometry. J. Hazard. Mater. 2011;188(1-3):311-318.
http://dx.doi.org/10.1016/j.jhazmat.2011.01.126