Determination of arsenic in agricultural soil samples using High-resolution continuum source graphite furnace atomic absorption spectrometry and direct solid sample analysis

TALANTA

卷:188

Article

Schneider, Mauana¹  Cadorim, Heloisa R.¹  Welz, Bernhard^1,2  Carasek, Eduardo¹  Feldmann, Jorg³ 

[1] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil

[2] Univ Fed Bahia, Inst Nacl Ciencia & Tecnol, CNPq, INCT Energia & Ambience, BR-40170115 Salvador, BA, Brazil

[3] Univ Aberdeen, Dept Chem, Trace Element Speciat Lab TESLA, Aberdeen AB24 3UE, Scotland

关键词: Arsenic determination;    Soil analysis;    Thermal power plants;    Direct solid sample analysis;    Graphite furnace atomization;    Spectral interference;   

DOI  :  10.1016/j.talanta.2018.06.052

来源: Elsevier

【 摘 要 】

Soils around coal-fired thermal power plants based on coal combustion can present high concentrations of arsenic. This fact has a direct effect on the food chain. Arsenic can be absorbed by plants and vegetables through the soil, which will then serve as food for different animals, spreading the contamination. A method has been developed using high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS) for direct determination of arsenic in solid soil samples. Different chemical modifiers were tested to suppress the matrix effects observed. Among them, the modifier that showed the best results was the Zr, used as a permanent modifier. The optimized pyrolysis and atomization temperatures were 1000 degrees C and 2200 degrees C, respectively. A calibration curve was established using aqueous standard solutions which was linear up to 16 ng of arsenic. The characteristic mass and limit of detection were 22 pg and 73 pg As, respectively. The accuracy of the method was verified using two certified reference materials and comparison with results obtained for samples after microwave-assisted digestion. Eleven soil samples were collected around the power plant Complex Jorge Lacerda-Tractebel Suezin, in the south of Santa Catarina, Brazil. The concentration of As ranged from 3.4 mg kg(-1) to 9.7 mg kg(-1), which is within the limits allowed by Brazilian legislation.

【 授权许可】

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