Browsing by Author "Ahmad Ismail"
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Item Open Access An assessment of selected trace elements in intertidal surface sediments collected from the Peninsular Malaysia(Springer, 2010) Syaizwan Zahmir Zulkifli; Ferdaus Mohamat-Yusuff; Takaomi Arai; Ahmad Ismail; Nobuyuki MiyazakiConcentrations of 11 trace elements (V, Cr, Co, Ni, Cu, Zn, As, Ag, Cd, Pb, and U) were determined in the intertidal surface sediments of Peninsular Malaysia.Item Restricted Assessment of metals contamination in Klang River surface sediments by using different indexes(Thai Society of Higher Eduation Institutes on Environment, 2011) Abolfazl Naji; Ahmad IsmailSurface sediments (0-5 cm) from 21 stations throughout Klang River were sampled for metal concentration as well sediment's pH, total organic carbon (TOC) and particles sizes to obtain an overall classification of metal contaminations in the areaItem Open Access Concentration of heavy metals in street dust and surface soils in urban and peri-urban regions in the Kuala Lumpur metropolitan area(Universiti Pertanian Malaysia Press, 2019) Ahmad Ismail; Munirah Hanapiah; Syaizwan Zahmir Zulkifli; Hishamuddin Omar; Nur Amiera KamarudinThe present study aims to determine the level of heavy metals in surface soils and street dust from selected urban and peri-urban locations in the metropolitan city of Kuala Lumpur. Samples were collected from 15 different locations, where Kuala Lumpur City Centre (KLCC) served as the centre point while other locations were located at specific distances from the centre. Surface soils and street dust were collected to detect the level of contamination based on five elements (Zn, Cu, Pb, Cd and Fe).Item Restricted Concentrations of trace elements in marine fish and its risk assessment in Malaysia(Elsevier, 2005) Tetsuro Agusa; Takashi Kunito; Genta Yasunaga; Hisato Iwata Annamalai Subramanian; Ahmad Ismail; Shinsuke TanabeConcentrations of trace elements (V, Cr, Mn, Co, Cu, Zn, Ga, Se, Rb, Sr, Mo, Ag, Cd, Sn, Sb, Cs, Ba, Hg, Tl, Pb and Bi) were determined in muscle and liver of 12 species of marine fish collected from coastal areas in Malaysia. To evaluate the health risk to Malaysian population through consumption of fish, intake rates of trace elements were estimated on the basis of the concentrations of trace elements in muscle of fish and daily fish consumption.Item Open Access Geofractionation of heavy metals and application of indices for pollution prediction in paddy field soil of Tumpat, Malaysia(Springer, 2013) Ai Yin Sow; Ahmad Ismail; Syaizwan Zahmir ZulkifliThe present study investigates the concentration of Pb, Cd, Ni, Zn, and Cu in the paddy field soils collected from Tumpat, Kelantan. Soil samples were treated with sequential extraction to distinguish the anthropogenic and lithogenic origin of Pb, Cd, Ni, Zn, and Cu. ELFE and oxidizable-organic fractions were detected as the lowest accumulation of Pb, Cd, Ni, Zn, and Cu. Therefore, all the heavy metals examined were concentrated, particularly in resistant fraction, indicating that those heavy metals occurred and accumulated in an unavailable form.Item Restricted Heavy metal concentrations in sediments off Bintulu, Malaysia(Pergamon Press Ltd, 1993) Ahmad IsmailThe present work thus provides a baseline against which the contamination from future developments in the Bintulu Port area may be assessed.Item Restricted Heavy metals bioavailability and pollution indices evaluation in the mangrove surface sediment of Sungai Puloh, Malaysia(Springer, 2018) Usman Sadiq Abubakar; Syaizwan Zahmir Zulkifi; Ahmad IsmailHeavy metals bioavailability, organic matter and grain size were investigated in the surface sediment of Sungai Puloh mangrove area using modified sequential extraction technique, loss on ignition and pipette method, respectively.Item Restricted Imposex in Thais gradata as a Biomarker for TBT Contamination on the Southern Coast of Peninsular Malaysia(Springer, 2010) Ferdaus Mohamat-Yusuff; Syaizwan Zahmir Zulkifli; Ahmad Ismail; Hiroya Harino; Mohd Kamil Yusoff; Takaomi AraiThais gradata samples were collected from six locations along the southern shores of Peninsular Malaysia and analyzed for imposex incidence and organotin (butyltins (BTs), including tributyltin, dibutyltin, and monobutyltin, and phenyltins (PTs), including triphenyltin, diphenyltin, and monophenyltin concentrations), in tissue burden.Item Restricted Interspecific Variation of Heavy Metal Concentrations in the Different Parts of Tropical Intertidal Bivalves(Springer, 2009) Franklin Berandah Edward; Chee Kong Yap; Ahmad Ismail; Soon Guan TanThe heavy metals in the total tissues and the different soft tissues of the bivalves were compared with the maximum permissible limits set by five different countries. From the comparison, it was found that most of the bivalves contained metal concentrations which were below the maximum permissible limits and should pose no toxicological risk to consumers.Item Open Access Johor Strait as a hotspot for trace elements contamination in Peninsular Malaysia(Springer, 2010) Syaizwan Zahmir Zulkifli; Ahmad Ismail; Ferdaus Mohamat-Yusuff; Takaomi Arai; Nobuyuki MiyazakiPresent study was conducted to evaluate current status of trace elements contamination in the surface sediments of the Johor Strait.Item Open Access Metals fractionation and evaluation of their risk connected with urban and industrial influx in the Klang River surface sediments, Malaysia(Thai Society of Higher Eduation Institutes on Environment, 2012) Abolfazl Naji; Ahmad IsmailIn the present study, concentration, distribution and speciation of trace metals were conducted to assess the overall classification of Ni, Cu and Pb as well as their risk status in the surface sediments of Klang River. Sequential extraction technique (SET) was used to evaluate the four (exchangeable, acid-reducible, oxidisable-organic and residual) fractions of the surface sediments.Item Restricted The background levels of heavy metal concentration in sediments of the west coast of Peninsular Malaysia(Elsevier, 1993) Ahmad Ismail; M.A. Badri; Mohd Noor RamlanThe west coast of Peninsular Malaysia is exposed to several sources of pollutants, predominantly from human activities. In this study heavy metal contamination was studied in the sediments collected from sampling stations all along the west coast of Peninsular Malaysia.