Triazines in the tropical lagoon system of Mundaú-Manguaba, NE-Brazil

Journal of the Brazilian Chemical Society

Débora A. Azevedo²  Thaís R. Silva²  Bastiaan A. Knoppers¹  Detlef Schulz-bull¹ 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Departamento de Química OrgânicaRio de Janeiro RJ ,Brazil

关键词: triazines;    gas chromatography-mass spectrometry;    water;    suspended matter;    sediments;    estuarine-lagoon;   

DOI  :  10.1590/S0103-50532010000600020

来源: SciELO

【 摘 要 】

This study addresses triazines in the tropical and eutrophic Mundaú-Manguaba estuarine-lagoon system (MMELS) located in the State of Alagoas, NE-Brazil, affected by sugar-cane monoculture in its lower drainage basin. Water and sediment samples from MMELS were collected during the wet post-harvest season (August/2006) and the dry harvest season (February/2008). Trace analysis of the triazines atrazine, simazine, deethylatrazine, deisopropylatrazine and deethyldeisopropylatrazine were performed in surface sediments, suspended particulate matter and in the dissolved fraction in water. Water samples were filtered and after the analytical procedures, the resulting extracts were analyzed by gas chromatography-mass spectrometry. Additionally, the analytical method for suspended particulate matter was evaluated, the recovery being between 72-123 % with relative standard deviations of 4.2-22 % and limits of detection around 0.2-0.3 ng L-1. Sediments fortified at 10, 20 and 50 ng g-1 were extracted with the ASE system and recovery experiments lied between 68-133 % with relative standard deviations of 2-34 %. The limits of detection were of 0.6-1.2 ng g-1. Atrazine was the sole triazine detected and only in suspended particulate matter during the wet season at four sites, with low concentrations of 3.1, 2.7, 1.6 and 0.7 ng L-1. This suggests that triazines are either largely retained and transformed within the sugar-cane fields and/or are readily diluted in the waters and degraded due to the intense metabolism of MMELS.

【 授权许可】

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