Temporal trends of polycyclic aromatic hydrocarbons (pahs) in a dated sediment core of a high atitude mountain lake: Chungara lake- northern chile (18° s)

• KARLA POZO ^[1] ; GUIDO PERRA ^[2] ; VICTORIA GOMEZ ^[4] ; RICARDO BARRA ^[3] ; ROBERTO URRUTIA ^[3]
  1. [1] Masaryk University

     Masaryk University

     Chequia

     
  2. [2] Università degli Studi di Siena

     Università degli Studi di Siena

     Siena, Italia

     
  3. [3] Universidad de Concepción

     Universidad de Concepción

     Comuna de Concepción, Chile

     
  4. [4] Universidad Católica Santísima Concepción Facultad de Ciencias

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 59, Nº. 3, 2014, págs. 2564-2567
• Idioma: inglés
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• Resumen

  • In this study levels, fluxes and temporal trend of PAHs are reported in a sediment core from Chungará Lake (18° S) in Northern Chile. The sediments were obtained by Kayac corer and freeze dried. PAHs were extracted in SOXHLET system and measured by HPLC with diode array detector and fluorescence detection. Sedimentary record chronology was determined using 210Pb isotopes and organic carbon (%) was also measured in sediments. Concentrations (ng g-1 d.w.) of PAHs were low ranging from ~1 to 50. PAHs fingerprint was dominated by 3-ring (21%) and 4-ring. Organic carbon (%) ranged from ~17 to 24 (21±3) and no statistical significant correlation (p<0.05) was detected between OC (%) and PAHs along the sediment core. PAHs fluxes (μg m-2yr-1) fluctuated from ~0.3 (cm 1) to 35 (cm 5) in 1978. LPAHs/HPAHs ratios (0.04 to 3) indicate petrogenic and pyrolytic origin of PAHs. This results contributes with new information of PAHs deposition at high altitudinal lake in Southern Hemisphere.