Risk Assessment of Heavy Metals in Imported Frozen Fish Scomber scombrus Species Sold in Nigeria: A Case Study in Zaria Metropolis

Table 2

Mean and standard deviation of metals concentrations in the tissues of Scomber scombrus (mg⋅kg⁻¹) wet weight.

Tissue	Cd = 6)	Pb = 6)	Hg = 6)	Fe = 6)	Ni = 6)
Skin (RS)	2.133 ± 0.025	17.150 ± 0.350	72.425 ± 0.030	16.700 ± 0.030	6.158 ± 0.010
Skin (EU)	1.158 ± 0.035	7.833 ± 0.005	66.542 ± 0.040	15.893 ± 0.020	9.025 ± 0.010
Muscle (RS)	2.192 ± 0.005	15.133 ± 0.010	75.692 ± 0.054	11.453 ± 0.020	6.042 ± 0.005
Muscle (EU)	2.375 ± 0.015	7.242 ± 0.010	73.400 ± 0.015	21.873 ± 0.025	8.942 ± 0.050
Gills (RS)	2.425 ± 0.015	15.942 ± 0.005	75.925 ± 0.005	234.81 ± 0.025	6.650 ± 0.010
Gills (EU)	1.125 ± 0.020	8.142 ± 0.015	80.358 ± 0.005	225.25 ± 0.010	9.067 ± 0.015
Liver (RS)	19.758 ± 0.030	16.617 ± 0.010	70.900 ± 0.010	375.93 ± 0.025	6.650 ± 0.020
Liver (EU)	10.658 ± 0.015	8.575 ± 0.005	73.958 ± 0.020	132.69 ± 0.040	8.108 ± 0.015
Intestine (RS)	7.692 ± 0.015	17.533 ± 0.020	71.342 ± 0.010	233.88 ± 0.045	6.800 ± 0.020
Intestine (EU)	5.492 ± 0.035	8.417 ± 0.020	75.875 ± 0.025	43.367 ± 0.045	8.558 ± 0.010
Kidneys (RS)	4.267 ± 0.040	17.558 ± 0.025	72.125 ± 0.015	70.780 ± 0.010	7.017 ± 0.005
Kidneys (EU)	5.408 ± 0.030	8.725 ± 0.015	66.600 ± 0.030	196.99 ± 0.035	8.650 ± 0.005
Brain (RS)	2.958 ± 0.015	16.942 ± 0.035	76.000 ± 0.010	57.580 ± 0.025	6.517 ± 0.100
Brain (EU)	1.600 ± 0.010	4.417 ± 0.025	68.650 ± 0.020	44.360 ± 0.040	8.233 ± 0.015
Bones (RS)	6.208 ± 0.010	16.708 ± 0.030	72.850 ± 0.030	52.807 ± 0.015	6.767 ± 0.010
Bones (EU)	1.608 ± 0.020	3.950 ± 0.015	70.558 ± 0.020	54.000 ± 0.015	8.167 ± 0.010
FAO/WHO [18]	0.100	0.400	0.500	—	—
CCFAC [57]	—	—	—	0.800	—
WHO [64]	—	—	—	—	0.200

is the number of batches analyzed.