Monitoring the level of metal pollution in a water body, especially in polluted areas, is crucial. Gastropod shells have been used as a biomonitor for metal pollution. The goal of this study was to evaluate the utilisation of the mudflat snails, Telescopium telescopium shells, as biomonitoring materials for nickel (Ni) pollution in the intertidal area. The snails and their habitat surface sediments were sampled from 17 sites in Peninsular Malaysia. Up to 21 individuals from each site were sampled and dissected. In addition to the shells, six parts of the soft tissues (cephalic tentacle, foot, gill, muscle, mantle, and remaining soft tissues) were analysed for Ni. The snail shell was found to be a potential biomonitoring material for Ni pollution based on four positive points: (i) higher value of shell/soft tissue ratios (> 1.00); (ii) categorisation as a ‘microconcentrator’ based on bioaccumulation factor; (iii) significant correlation coefficients (at least P < 0.05) and significant influential total Ni levels in the sediments to the shell Ni; and (iv) higher precision of Ni in the shells based on the lowest value of the coefficient of variation of Ni. The described results indicated that the shell of T. telescopium would be suitable for assessing Ni pollution in the intertidal areas.
There are many biomonitoring studies of nickel in the mollusks, but to understand how the nickel is accumulated in the human body and the health risk posed by the metal is not a straightforward formula. Therefore, the aim of this paper is to draw a conceptual model of nickel content in the bodies of invertebrate mollusks and their gastrointestinal absorption of nickel. This model is useful to understand how nickel accumulation in the tissues of the mollusks could affect the nickel oral ingestion pathways. This conceptual model can shed some light on the mechanisms of nickel that may cause various toxicological risks and target cancer slope formulation in the future.
Heavy metal pollution in agricultural soil has been a worldwide issue where it may bring upon the bioaccumulation of the pollutants in crops such as vegetables [1]. Human activities such as mining, the use of agricultural pesticides, and untreated water irrigation contributed to a major part of metal contamination in soil and vegetables [2,3]. Metal-contaminated vegetables has been a major concern for consumers because it constitutes one of the main route of heavy metals into the
This study determined the levels of Cd, Cu, Fe, Ni, and Zn in the soft tissues and shells of barnacles (Balanus sp.) collected from the Kuala Juru, Sebatu, Sg. Ayam and Kg. Pasir Puteh, Peninsular Malaysia, obtained in 2008. The metal concentrations (µg/g dry weight) in the soft tissues of Balanus sp. received from four sites in Peninsular Malaysia ranged from 2.93-4.17 for Cd, 20.2-92.5 for Cu, 480-1193 for Fe, 6.40-18.0 for Ni, and 224-414 for Zn. Based on the present data, the trace metal bioavailability's to the Balanus in all the populations, especially in a known polluted site at Kg. Pasir Puteh is low. Overall, this preliminary baseline data can be used for regular ecological monitoring for the effective management of the coastal area in Malaysia.
The objective of this paper was to discuss the future potential of Hydropower Generation (HG) in Malaysia based on available publications published between 1970 and 2021 in the Scopus database (12 papers) and non-Scopus (3 papers). Out of the 15 papers reviewed, it was found that 73% of papers studied and discussed the economic aspect of the HG in Malaysia, while 27-47% studied and discussed the social and environmental aspects although some could merge with the economic factor. This paper indicated the economic aspect as primary importance in the hydropower studies and construction in their planning processes until full implementation of this Renewable Energy (RE) in Malaysia. This analysis shows that Large (> 10 MW) Hydropower System (HPS) papers only covered 31% of the 12 papers (discarding the 2 unspecified papers) reviewed in this study, while the rest (69%) covered mostly Micro (< 100 kW) HPS (46%), followed by Mini (< 1 MW), Small (< 10 MW), and Pico (< 5 kW) HPSs. It is almost certain, the Micro HPS or lower capacities of HPS hold the bright future in the reduced costs of energy consumption in Malaysia with special reference to economic factors that would boost the social development the betterment of well-being of the nation.
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