Determinação de metais e metalóides em tecido muscular de Mugil spp. (Tainha) e em sedimentos de manguezal da região Norte da Baía de Todos os Santos, Bahia, Brasil

Abstract

The coast of Bahia de Todosos Santos (BTS ) suffered for decades social and environmental impacts arising from activities such as real estate expansion tourism, overfishing, somestic sewage discharge, dumping of domestic and industrial effluents. The latter, especially arising from the oil industry that has settled in the northern region of BTS. The objective was to conduct an assessment of metals and non-metals in muscle tissue samples from Mugil spp. and sediments. The samples were collected in the region subject to oil activities in the city of Candeias, Bahia, northern BTS. The methods for decomposition of muscular tissue Mugil spp. were heated in Parr pump (PB) and heating assisted by microwave (MO). The results of the statistical test revealed significant differences between the two extraction methods for all elements with the exception of Fe (p = 0,2465) and Al (p = 0,1853). Accuracy was assessed by certified reference materials analysis (oyster tissue SRM NBS–1566b and cod muscle CRM BCR–422). The recovery rates for these tissue ranged from 78.0 % the 98.3. Samples of Mugil spp . the measured concentrations in μg g-1 (dry basis ) were: Al (0,55 – 14,91), Ca (310 – 1240), Cr (0,01 – 0,36), Cu (0,02 – 3,89), Fe (11,98 – 32,36), Mg (1000 – 1320), Mn(0,33 – 1,80) and Zn (10,28 – 27,73).In the sediment samples were measuredin μg g-1 (dry basis ): Al(14,8 – 66,50), Ca (1,78 – 49,67), Cd, (< 0,001 – 1,07), Cr (18,84 – 44,27), Cu (9,94 – 36,00), Fe (15,51 – 49,27), Mg (5,53 – 30,48),Mn(0,06 – 0,81), Mo (< 0,002 – 7,51), Ni (8,39 – 28,08), Pb(5,19 – 19,57), Se (< 0,023 – 3,37), V (21,58 – 74,49)and Zn (18,43 – 98,33).Based on current legislation, the results indicate no heavy metals levels that may be contaminatedboth the muscle tissue of Mugil ssp. when to sediment for samples analyzed in Northern BTS.