Nasrul Hamidin, Assoc. Prof. Ts. Dr.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39977
This page provides access to scholarly publication by UniMAP Faculty members and researchers2024-03-29T01:06:28ZVolatile aromatic hydrocarbons (VAHs) in residential indoor air in Brisbane, Australia
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41343
Volatile aromatic hydrocarbons (VAHs) in residential indoor air in Brisbane, Australia
Nasrul, Hamidin; Jimmy, Yu; Dung Tri, Phung; Des William, Connell; Cordia, Chu
Volatile aromatic hydrocarbons (VAHs: benzene, toluene, ethylbenzene, mp-xylene, o-xylene, styrene, naphthalene) in residential indoor air in Brisbane, Australia were measured in 32 houses. The total VAHs (TVAHs) levels ranged between 2 and 137μg/m3 and were lower than the most of the houses in the literature data. The VAHs were believed to originate from heat insulation systems, building material products as well motor vehicles but naphthalene and styrene originated from other sources. Internal garages had concentrations which are higher than the indoor air by 25-50% due to the presence of motor vehicles and may be a major source of indoor VAHs. However indoor concentrations are higher than that in the outdoor ambient air. The age of the house was found to be negatively related to VAHs concentrations in the houses with the half-life of TVAH at approximately 13years. The concentration levels of benzene, toluene, ethylbenzene and styrene are well below the guideline values set by agencies from Hong Kong, Japan, Germany and the WHO while the concentration level of naphthalene in one house exceeded the guideline value from Germany.
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2013-09-01T00:00:00ZComprehensive review and compilation of treatment for azo dyes using microbial fuel cells
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41187
Comprehensive review and compilation of treatment for azo dyes using microbial fuel cells
Viswanathan, Murali; Ong, Soon-An; Ho, Li Ngee; Wong, Yee Shian; Nasrul, Hamidin
Microbial fuel cells (MFCs) represent an emerging technology that focuses on power generation and effluent treatment. This review compiles articles related to MFCs using azo dye as the substrate. The significance of the general components in MFCs and systems of MFCs treating azo dye is depicted in this review. In addition, degradation of azo dyes such as Congo red, methyl orange, active brilliant red X-3B, amaranth, reactive blue 221, and acid orange 7 in MFCs are summarized. Further exploration and operational modification are suggested to address the challenges of complete removal of azo dye with maximum power generation in an MFC. In addition, a sequential treatment system with MFCs is suggested for complete mineralization of azo dye.
Link to publisher's homepage at http://www.wef.org
2013-03-01T00:00:00ZCharacterization of bio-oil from palm kernel shell pyrolysis
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41171
Characterization of bio-oil from palm kernel shell pyrolysis
Nasrul, Hamidin; Umi Fazara, Md. Ali; Che Zulzikrami Azner, Abidin; Razi, Ahmad
Pyrolysis of palm kernel shell in a fixed-bed reactor was studied in this paper. The objectives were to investigate the effect of pyrolysis temperature and particle size on the products yield and to characterize the bio-oil product. In order to get the optimum pyrolysis parameters on bio-oil yield, temperatures of 350, 400, 450, 500 and 550 °C and particle sizes of 212-300 μm, 300-600 μm, 600μm-1.18 mm and 1.18-2.36 mm under a heating rate of 50 °C min-1 were investigated. The maximum bio-oil yield was 38.40% at 450 °C with a heating rate of 50 °C min-1 and a nitrogen sweep gas flow rate of 50 ml min-1. The bio-oil products were analysed by Fourier transform infra-red spectroscopy (FTIR) and gas chromatography-mass spectroscopy (GCMS). The FTIR analysis showed that the bio-oil was dominated by oxygenated species. The phenol, phenol, 2-methoxy- and furfural that were identified by GCMS analysis are highly suitable for extraction from the bio-oil as value-added chemicals. The highly oxygenated oils need to be upgraded in order to be used in other applications such as transportation fuels.
Link to publisher's homepage at http://jmes.ump.edu.my/
2014-12-01T00:00:00ZHuman health risk assessment of chlorinated disinfection by-products in drinking water using a probabilistic approach
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/41134
Human health risk assessment of chlorinated disinfection by-products in drinking water using a probabilistic approach
Nasrul, Hamidin; Yu, Qiming Jimmy; Connell, Des William
The presence of chlorinated disinfection by-products (DBPs) in drinking water is a public health issue, due to their possible adverse health effects on humans. To gauge the risk of chlorinated DBPs on human health, a risk assessment of chloroform (trichloromethane (TCM)), bromodichloromethane (BDCM), dibromochloromethane (DBCM), bromoform (tribromomethane (TBM)), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) in drinking water was carried out using probabilistic techniques. Literature data on exposure concentrations from more than 15 different countries and adverse health effects on test animals as well as human epidemiological studies were used. The risk assessment showed no overlap between the highest human exposure dose (EXPD) and the lowest human equivalent dose (HED) from animal test data, for TCM, BDCM, DBCM, TBM, DCAA and TCAA. All the HED values were approximately 104-10 5 times higher than the 95th percentiles of EXPD. However, from the human epidemiology data, there was a positive overlap between the highest EXPD and the lifetime average daily doses (LADDH) for TCM, BDCM, DCAA and TCAA. This suggests that there are possible adverse health risks such as a small increased incidence of cancers in males and developmental effects on infants. However, the epidemiological data comprised several risk factors and exposure classification levels which may affect the overall results.
Link to publisher's homepage at https://www.elsevier.com
2008-07-01T00:00:00Z