Comparative Measurements and their Compliance with Standards of Total Mercury Analysis in Soil by Cold Vapour and Thermal Decomposition, Amalgamation and Atomic Absorption Spectrometry

• Published in: Water, air, and soil pollution Vol. 224; no. 2; pp. 1 - 13
• Main Authors: Leiva G., Manuel A., Morales, Sandra, Segura, Rodrigo
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2013; Springer; Springer Nature B.V
• Subjects: Analysis; Applied sciences; Atmospheric Protection/Air Quality Control/Air Pollution; Atomic absorption spectrophotometry; Atomic absorption spectroscopy; Chemical contaminants; Chemical tests and reagents; Climate Change/Climate Change Impacts; Cold; Compliance; Decomposition; Earth and Environmental Science; Environment; Environmental monitoring; Exact sciences and technology; Hydrogeology; International standards; Mathematical models; Measurement techniques; Mercury; Methods; Pollution; Potassium; Quality control; Reagents; Scientific imaging; Soil analysis; Soil contamination; Soil Science & Conservation; Spectral analysis; Spectrometry; Spectrophotometry; Spectrum analysis; Statistical analysis; Studies; Sulfur; Thermal decomposition; Water Quality/Water Pollution; Mercury in soil; Uncertainty; Standards compliance; Atomic absorption spectrometry; Vapor; Thermal decomposition; Amalgamation; Soil pollution; Heavy metal; Trace element; Soils; Poison; Mercury; Thermal degradation
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-012-1390-3

Two methods to measure mercury concentration in soil are compared, and their compliance with international standards is determined: cold vapour atomic absorption spectrometry and thermal decomposition, amalgamation and atomic absorption spectrophotometry. The detection limit, quantification limit and uncertainty of these two analytical methods were evaluated and compared. The results indicated that thermal decomposition, amalgamation and atomic absorption spectrophotometry had a lower quantification limit and uncertainty than cold vapour atomic absorption spectrometry (quantification limit, 0.27 vs. 0.63 mg kg −1 ; expanded uncertainty, 9.30 % vs. 10.8 %, respectively). Thermal decomposition, amalgamation and atomic absorption spectrophotometry allowed the determination of the base values for the concentration of mercury in soil recommended by international standards, achieving a lower detection limit than cold vapour atomic absorption spectrometry under the study conditions. In addition, thermal decomposition, amalgamation and atomic absorption spectrophotometry represent a more environmentally friendly alternative for mercury determination because this method uses fewer reagents and therefore generates less waste.