This study is to assess the level of some heavy metals in samples of wild and cultured catfish (Clarias gariepinusis) regularly consumed, therefore, the need to ascertain the safety of the consumption of this fish. Fresh samples of the wild and the cultured Clarias fish of different sizes were purchased from different locations in Samaru – Zaria, Nigeria. The fish samples were digested with a mixture of 20 cm3 concentrated nitric acid and 5 cm3perchloric acid (ratio 4:1). The concentrations of lead, copper, chromium, cadmium and Zinc were determined using atomic absorption spectrophotometer (AAS). The results obtained indicated that in both wild and cultured Clarias gariepinusis, the concentration of Zn > Cr > Cu > Pb > Cd. The concentrations of all the heavy metals determined in the various sizes of wild Clarias gariepinusis samples were higher than the corresponding cultured Clarias fish. In both wild and the cultured Clarias fish the concentrations of Cd, Pb and Cr were found to be in the order of: small size > medium size > large size, but for Cu and Zn there were variations in concentrations. In wild Clarias fish the concentrations of Cd, Pb and Cr were found to be higher than the permissive limits set by FAO/WHO, while in cultured fish only Cr concentration was higher than the permissive limit. Though the contents of heavy metals determined in this study have a great health implication on human, aquaculture and fisheries activities be encouraged.
Cwmystwyth Lead Mine was an abundant mine site with pugh’s and kingside water drainages shows contaminated water in the research area with no much scientific evidence to ascertain the level of the pollution. Hence this research was designed to study level of lead and zinc in contaminated soil in which the bio-availability and bio-accessibility were measured. Sixteen (16) soil samples were taken at random using soil auger and a hand trowel. The samples were dried using an oven set at a constant temperature of 400oC for 72 hours. Wire mesh (250 microns) was used to sift the samples. The Unified (BARGE) method was used. The mimics mixtures of saliva, gastric, duodenal, and bile fluids. Three-stage mimic processes were performed, in the mouth, the stomach and intestinal cavities. All mimic digestive fluids were placed in the rotator water bath for 1hr at 37oC. The bioaccessibility of the soil Samples were analyzed by inductively coupled plasma-optical emission spectrophotometer (ICP-OES) method. The results were obtained using XRF and ICP methods. The percentage concentration of lead in the topsoil was 0.64% and in the bottom soil was 1.47%, with a total mean concentration of 1.06% in combined top and bottom soil. Zinc concentrations in the top and bottom soils were 0.22 and 0.45%, respectively, with a computed total mean of 0.34%. The findings revealed a highly significant difference between lead and zinc in both the top and bottom soil samples (LSD = P0.05). The average concentrations of lead and zinc extracted in both the stomach and intestinal stages were 15.98% and 1.23%, respectively
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.