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Item Embargo The effects of agrochemicals on an aquatic ecosystem : A case study from the Krian River basin, Malaysia(Springer, 1990) SIAW-YANG YAP; HEAN-TATT ONGThe existing environment of the Krian River basin in Malaysia is not in its natural form for it has been much developed into agricultural lands (105,000 ha). The growing demand for agricultural lands requires further reclamation of swampy forests, which will result in an increased use of fertilisers (estimated 10 percent increase, from 29,500 t to 32,500 t), weedicide, dalapon (estimated 6 percent increase, from 187,620 kg to 199,530 kg) and pesticides, BHC and thiodan/endosulfan (estimated 2 percent increase, from 312 kg to 318 kg).Item Embargo Analysis of pesticide residues in Peninsular Malaysian waterways(Kluwer Academic Publishers, 1991) Tan Guan Huat; Goh Swee Hock; VijayaletchumyThe use of organochlorine pesticides has caused concern due to their effects on human health and the Malaysian aquatic ecosystem, particularly so in view of their persistent and bioaccumulative properties. Since the extent of organochlorine pesticide pollution in Malaysian waterways is unknown except for isolated instances, a systematic survey has now been carried out.Item Embargo Phenolic water pollutants in a Malaysian River basin(Kluwer Academic Publishers, 1991) Md. Pauzi Abdullah; Hamonangan NainggolanPhenolic chemicals with their very low taste and odour thresholds, high persistence and toxicity, are of growing concern as water pollutants. The compounds are known to exist in raw water as well as in treated water. The level of phenolic priority pollutants in water within the catchment area of the Linggi River Treatment Plant in Negeri Sembilan, Malaysia, which includes the Linggi river basin, was monitored.Item Embargo Trace monitoring of water-borne phenolics in the Klang River Basin(Kluwer Academic Publishers, 1993) Guan H. Tan; C.L. ChongThe Klang River Basin is located in the most densely populated region in Malaysia, with its heavy concentration of industries and population. A systematic study of the pollution to this river system caused by phenolic compounds have been carried out under this project. Analyses of water samples from the Klang River by high performance liquid chromatography (HPLC) with an ultraviolet (UV) detectorItem Embargo Organochlorine pesticide residue levels in Peninsular Malaysian rivers(Springer, 1994) G. H. Tan; K. VijayaletchumyThe present study was carried out to measure the extent of environmental contamination by these organochlorine pesticides in river waters from Peninsular Malaysia. Water samples were collected from different stations along 25 major rivers in Peninsular Malaysia (Figure 1) from 1990 to 1991.Item Embargo Residue levels of phthalate esters in water and sediment samples from the Klang River basin(Springer, 1995) G. H. TanThe present survey on residue levels of phthalate esters covers the period from January 1992 to February 1993.Item Embargo Regime hydraulic concepts and equations: A case of Klang River, Malaysia(Universiti Pertanian Malaysia Press, 1999) Aziz F. Eloubaidy; T. A. Mohammed; Abdul Halim Ghazali; A. B. JusohUpdating and testing of available river regime relationships governing the various factors involved in alluvial river design are presented. Analysis of relevant laboratory and field data, gathered from four gauging stations along the water course of Klang River in Malaysia, were undertaken in order to formulate new regime concepts and equations characterizing the river. The functional formulations, to include the slope, rating and flow equations were achieved by employing dimensional analysis techniques relating the geometry and flow parameters.Item Embargo A study of the Ampang landfill leachate characteristics and its effects on river water quality parameters(Universiti Malaya, 2003) Fatimah Kamal Batcha; P. Agamuthu; Shaliza IbrahimPhysical and inorganic parameters have been measured for leachate from the Ampang Municipal Landfill before and after the landfill was closed. Although there were significant reduction in the parameter concentrations after the landfill closure, the COD value was still 20 times higher than the requirement of EQA 1974 Standard A. BOD, TSS, Fe, Mg, Cd and Pb were also higher than the Standards requirements after closure. The effects of leachate seeping into the Michu River, have been investigated through analyses of water samples taken along the Michu and Langat Rivers up to the Puncak Niaga Langat River water intake point.Item Embargo Metal distribution and contamination of the Mamut River, Malaysia, caused by copper mine discharge(Springer, 2004) M. F. Ali; L. Y. Heng; W. Ratnam; J. Nais; R. RipinThis study was carried out along the river bank of Mamut and Kipunyit Rivers to ascertain whether the river is safe for human recreational activities after the cessation of mining.Item Embargo Dissolved nutrients and chlorophyll a status of the Setiu River, Terengganu, Malaysia(Springer, 2004) S. Suhaimi; N. M. Tahir; S. SuriyatiThe aim of this paper is to illustrate how the nutrients concentration may be affected by human activities and how these may have an impact on the distribution of chlorophyll a.Item Embargo Longitudinal variation of water quality in Sungai Jarum catchment - linking ecology with hydrology for reservoir management(Environmental Management Society Malaysia, 2004) Wan Ruslan Ismail; Ku A edah Ku HashimIn recent years, human activities, such as urbanization and agriculture, have been blamed for the degradation of water quality in many developing countries. Rivers draining agricultural land are susceptible to diffused or non-point source pollution. A study was conducted in Timah Tasoh catchment areas with the aim to investigate the effect of land use activities and eutrophication of the Timah Tasoh reservoir. A water quality monitoring programme was carried out from January 2001. This paper, however, focuses on the longitudinal variation of water quality parameters of Sungai Jarum as one of the two major water sources for the reservoir.Item Embargo Distribution of heavy metals found in three major rivers of North-Eastern Pulau Langkawi(Universiti Malaya, 2005) Lee Chai Peng; Meor Hakif HassanA preliminary study on the distribution of dissolved heavy metals such as Cu, Cd, Fe, Pb and Zn in seawater were carried out along the three major rivers of Air Hangat, Kilim and Kisap located in north-eastern Pulau Langkawi. Samples were collected from a total of nine selected stations located along these rivers where salinity ranges from 32-36 ppt. Almost all elements showed little variation in concentration along the stretches of the rivers to the open sea. This indicates that their distributions in the coastal area are not regulated by dilution with open seawater.Item Embargo Water level data modeling with bilinear time series analysis(Universiti Malaya, 2006) Mohd. Sahar Yahya; Ibrahim Mohamed; Azami Zaharim; Mohammad Said ZainolIn the literature, many time series data, such as the economic and hydrological data, show various nonlinearity characteristics. The Keenan's test and F-test are employed in identifying a nonlinear data set. This article looks at the modeling of nonlinear time series data using bilinear time series model. The model is an extension of autoregressive model such that an extra term representing the bilinear characteristic is introduced. The estimation of bilinear models is obtained using nonlinear least squares method. As an illustration, analysis on water level of Sungai Kelantan using the above method is presented.Item Embargo Anthropogenic impacts on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River, Peninsular Malaysia(Elsevier, 2006) M.Z. Azrina; C.K. Yap; A. Rahim Ismail; A. Ismail; S.G. TanA study of the impacts of anthropogenic activities on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River (Peninsular Malaysia) was conducted. Four pristine stations from the upstream and 4 stations at the downstream receiving anthropogenic impacts were selected along the river. For 4 consecutive months (March-June 1999), based on the Malaysian DOE (Malaysia Environmental Quality Report 2000, Department of Environment, Ministry of Science, Technology and Environment Malaysia. Maskha Sdn. Bhd. Kuala Lumpur, 86pp; Malaysia Environmental Quality Report 2001, Department of Environment, Ministry of Science, Technology and the Environment Malaysia) water quality index classesItem Embargo Hydrodynamic behaviour change at Rambai river outlet, Juru river basin, Penang(Environmental Management Society Malaysia, 2006) Edlic Sathiamurthy; Chan Ngai WengRambai Valley is a partially urbanized and flood prone coastal plain located in the State of Penang. The valley is drained by Rambai River and its tributaries. Rambai River water level flux is subjected to daily tidal oscillation as the river is connected to the sea through the Juru River. During heavy rainfall events, the interactions between tidal intrusion and peak-flows in this coastal floodplain caused floods to occur. Tidal intrusion prevents effective outflows resulting in the accumulation of water that results in severe floodingItem Embargo Water quality changes in Chini Lake, Pahang, West Malaysia(Springer, 2007) Mohammad Shuhaimi-Othman; Eng C. Lim; Idris MushrifahA study of the water quality changes of Chini Lake was conducted for 12 months, which began in May 2004 and ended in April 2005. Fifteen sampling stations were selected representing the open water body in the lake. A total of 14 water quality parameters were measured and Malaysian Department of Environment Water Quality Index (DOE-WQI) was calculated and classified according to the Interim National Water Quality Standard, Malaysia (INWQS).Item Embargo Contamination levels of selected organochlorine and organophosphate pesticides in the Selangor River, Malaysia between 2002 and 2003(Elsevier, 2007) Kok Hoong Leong; L.L. Benjamin Tan; Ali Mohd MustafaThis study was conducted from 2002 to 2003 to determine the levels of selected organochlorine and organophosphate pesticides in the Selangor River in Malaysia. Surface water samples have been collected seasonally from nine sites along the river. A liquid-liquid extraction followed by gas chromatography-mass spectrometry technique was used to determine the trace levels of these pesticide residues.Item Embargo A preliminary study of the distribution of selected trace metals in the Besut River Basin, Terengganu, Malaysia(Springer, 2008) S. Suratman; H. C. Hang; N. A. M. Shazili; N. Mohd TahirThis paper presents a preliminary result carried out in the Besut River basin, Terengganu, Malaysia to determine the selected trace metal concentrations.Item Embargo Assessment of surface water quality of selected estuaries of Malaysia: multivariate statistical techniques(Springer, 2008) Abbas F. M. Alkarkhi; Anees Ahmad; Azhar Mat EasaMultivariate statistical techniques such as cluster analysis (CA), factor analysis (FA) were used for the evaluation of spatial variations and the interpretation of a large complex water quality data set of two selected estuaries of Malaysia. The two locations of interest with 10 sites in each location were Kuala Juru (Juru estuary) and Bukit Tambun (Jejawi estuary).Item Embargo Trend in metals variation in Tasik Chini, Pahang, Peninsular Malaysia(Springer, 2008) M. Shuhaimi-Othman; I. Mushrifah; E.C. Lim; A. AhmadWater from 15 sampling stations in Tasik Chini (Chini Lake), Peninsular Malaysia were sampled for 12months from September 2004 until August 2005 and analyzed for 11 metals including iron (Fe), aluminum (Al), manganese (Mn), barium (Ba), zinc (Zn), lead (Pb), copper (Cu), cadmium (Cd), nickel (Ni), chromium (Cr) and cobalt (Co).