Bioaccumulation of Persistent Environmental Pollutants (PEPs) in the Mud Catfishes (Clarias gariepinus and Heterobranchus longifilis) from the Ogu Creek, Rivers State, Nigeria

The international journal of marine science Pub Date : 2019-01-01 DOI:10.5376/ijms.2019.09.0007

D. H. Ogbuagu, Marcus Osezojie Idewele, Kingsley Prince Nzekwue

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引用次数: 2

Abstract

The long-term discharge of poorly treated petroleum refinery effluent into the Ekerekana Creek, proximal to the Ogu Creek in Ogu, Rivers State, Nigeria, as well as contributions from artisanal refining have created worries about safety to health of consumers of the catfish delicacies, Clarias gariepinus and Heterobranchus longifilis from this coastal water. This research investigated the presence and levels of trace elements (Zn, Cr, Cd, Pb, Mg, Ca, K, Na, Fe and Mn) and hydrocarbons (Total Petroleum HydrocarbonTPHs, Benzene, Toluene, Ethylbenzene and Xylenes-BTEX, and Polycyclic Aromatic Hydrocarbons-PAHs) and Phenol in tissues of the fishes. In C. gariepinus, mean maximum accumulations in mg/kg were as follows: Mg 15.01±2.38 (muscle), Zn 10.25±2.62 (muscle), Fe 9.51±0.53 (gills), K 7.01±0.88 (muscle), Ca 0.42±0.05 (muscle), Pb 0.06±0.01 (muscle), Mn 1.58±0.45 (liver), TPH 6.65±0.42 (muscle), PAHs 0.24±0.05 (muscle), BTEX 0.07±0.01 (muscle) and Phenol 0.007±0.001 (muscle). In H. longifilis, accumulations in mg/kg were as follows: Mg 17.21±1.84 (muscle), Zn 11.27±2.49 (muscle), Fe 11.39±1.64 (gills), K 7.66±1.24 mg/g (muscle), Cd 0.47±0.043 mg/g (muscle), Pb 0.056±0.006 mg/g (muscle) and Mn 1.16±0.268 (liver), TPH 8.69±0.60 (muscle), PAHs 0.49±0.085 (muscle), BTEX 0.09±0.005 (muscle) and Phenol 0.0016±0.0003 (muscle). The accumulations of Cd, Pb, Mg, Ca, K, Na, Fe and Mn in C. gariepinus (Sig. values=0.001, 0.002, 0.011, 0.003, 0.004, 0.008, 0.000, 0.025 respectively) and those of Zn, Cd, Pb, Mg, Ca, K, Na, Fe and Mn (Sig. values=0.024, 0.000, 0.002, 0.002, 0.002, 0.008, 0.024, 0.005, 0.012 respectively) in H. longifilis differed significantly between tissues from impacted and reference locations at p<0.05. TQ/HQ values of, especially Cd and Zn were high (6.80-11.00 and 1.38-3.24 respectively) and exceeded regulatory limits in both fish species.

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尼日利亚河流州奥古溪泥鲶(Clarias gariepinus和Heterobranchus longifilis)体内持久性环境污染物的生物积累

长期将未经处理的炼油厂废水排放到尼日利亚河流州奥古市奥古河附近的Ekerekana河，以及手工精炼所产生的排放物，使人们担心从这一沿海水域食用美味鲶鱼、Clarias gariepinus和Heterobranchus longifilis的消费者的健康安全。本文研究了鱼类组织中微量元素(Zn、Cr、Cd、Pb、Mg、Ca、K、Na、Fe、Mn)和烃类(总石油烃tphs、苯、甲苯、乙苯和二甲苯- btex、多环芳烃- pahs)和苯酚的存在和含量。平均最大累积量mg/kg为:mg 15.01±2.38(肌肉)、Zn 10.25±2.62(肌肉)、Fe 9.51±0.53(鳃)、K 7.01±0.88(肌肉)、Ca 0.42±0.05(肌肉)、Pb 0.06±0.01(肌肉)、Mn 1.58±0.45(肝脏)、TPH 6.65±0.42(肌肉)、PAHs 0.24±0.05(肌肉)、BTEX 0.07±0.01(肌肉)、苯酚0.007±0.001(肌肉)。长鳍鱼的mg/kg累积量分别为:mg 17.21±1.84(肌肉)、Zn 11.27±2.49(肌肉)、Fe 11.39±1.64(鳃)、K 7.66±1.24 mg/g(肌肉)、Cd 0.47±0.043 mg/g(肌肉)、Pb 0.056±0.006 mg/g(肌肉)、Mn 1.16±0.268(肝脏)、TPH 8.69±0.60(肌肉)、PAHs 0.49±0.085(肌肉)、BTEX 0.09±0.005(肌肉)、苯酚0.0016±0.0003(肌肉)。影响区和参考区长尾黄颡鱼组织中Cd、Pb、Mg、Ca、K、Na、Fe、Mn的累积量(sigg值分别为0.001、0.002、0.011、0.003、0.004、0.008、0.000、0.025)和Zn、Cd、Pb、Mg、Ca、K、Na、Fe、Mn的累积量(sigg值分别为0.024、0.000、0.002、0.002、0.002、0.008、0.024、0.005、0.012)差异显著(p<0.05)。其中镉和锌的TQ/HQ值较高(分别为6.80 ~ 11.00和1.38 ~ 3.24)，均超过了规定限值。

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The international journal of marine science

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