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2011, Number 4

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waxapa 2011; 3 (4)

Evaluation of contamination levels by organochlorine pesticides residues on sediment and fishes from Aguamilpa reservoir, Nayarit, México

Aranguré ZFJ, Zambrano CRM, González TL, Robledo MML

Language: Spanish
References: 28
Page: 20-35
PDF size: 226.27 Kb.


ABSTRACT

In the present study, sediment and fishes samples; tilapia (Oreochromis aureus), lobina (Micropterus salmoides), bagre (Ictalurus punctatus), carp (Cyprinus carpio) and palacha (Dorosoma smithi), collected from the reservoir from the Hydroelectric Aguamilpa, Nayarit, Mexico, were analyzed of some organochlorine pesticides residues and their metabolites and also it determined the amount of organic matter. By the great agricultural activity and fishing that is self-practical in this reservoir. The organochlorine compounds in sediment and fishes, were extracted hexane in a soxhlet system and the identified and quantified by gas chromatography using electron capture detector. For the previous, eight sampling sites were selected in the area for investigation along the reservoir. Fishes and recent superficial sediment were collected in June (dry season) and September (rain season) in 2004. The following pesticides were identified in the sediment, alpha-HCH, beta-HCH, gamma-HCH, delta-HCH, p,p’-DDD, p,p’-DDE, heptachlor, heptachlor epoxide, aldrin, dieldrin, endosulfan I, endosulfan sulphate, endrin and endrin aldehyde. It is important to note that range of alpha-HCH 1.06 to 6.38, endosulfán I 1.84 to 21.23, endrín 1.07 to 3.63 and p,p’-DDE 0.30 to 2.25, ng g-1 dry weight, respectively. The concentrations of HCH’s (sum of alpha, beta, gamma and delta, isomers) ranged from 4.44 a 19.37, ng g-1 dry weight. The HCH’s detected in de sediment samples were mainly alpha- HCH (›90% of HCH’s), followed by beta-HCH, gamma-HCH and delta-HCH. In the steak fishes were detected in greater numbers: alpha-HCH (0.23), beta-HCH (5.35), aldrin (4.95), heptachlor epoxide (1.11), endosulfan I (5.98), endosulfan II (7.58), endrin (6.07), endrín aldehyde (8.24), dieldrín (6.83), p,p’-DDD (3.5O), p,p’-DDT (1.10), ng g-1 dry weight. Nevertheless, levels of organochlorine pesticide in fish steak were lower than the Food and Drug Administration (FDA) maximun permissible limits.


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