Tracing the sources of lead (Pb) in Brunei Bay, Borneo by using integrated spectrometry ICP-MS and chemometric techniques

Ghazali, Adiana; Juahir, Hafizan; Bidai, Joseph; Shazili, Noor Azhar Mohamed

doi:10.1016/j.marpolbul.2017.08.055

Cited by 20 publications

(11 citation statements)

References 48 publications

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“…The sticky and powdered extracts of FD were placed direct on the diamond crystal for data acquisition. The data were recorded at the mid-IR range of 4000-600 cm-1 [24].Spectroscopic information was gotten from ATR-FTIR analysis spectra information as it was a basic, fast and precise spectroscopy method that has been connected for multivariate analysis for plant extraction in deciding the vibration functional groups and polar compounds . Instrumental noise region of spectra (400-539 cm-1) was then cut off based on the numerical data generated by the noise.…”

Section: Attenuated Total Reflectance -Fourier Transform Infrared Spementioning

confidence: 99%

Pattern Recognition of Melaleuca cajuputi Powell Essential Oils Fingerprint in Terengganu, Malaysia Using Chemometric Approach

Abdullah¹,

Juahir²,

Lananan³

et al. 2018

IJET

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Cajuputi essential oil is extracted from the leaves of Melaleuca cajuputi Powell. This study is performed to spatially classify the variation of Melaleuca cajuputi essential oil fingerprint based on different sampling location using chemometric technique along Terengganu coastal area. Discriminant Analysis (DA) successfully discriminate 10 fingerprint of essential oil into three different groups with three significant peaks in FTIR analysis. Hierarchical agglomerative cluster analysis (HACA) successfully grouped the 10 sampling stations into three groups (cluster A, B and C).Classification criteria is based on the intensity movement of functional group either bending or stretching of the essential oil compound Multiple linear regression (MLR) was used to develop an equation model that explains the prediction of species fingerprint in each cluster by different locations.

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Section: Attenuated Total Reflectance -Fourier Transform Infrared Spementioning

confidence: 99%

Pattern Recognition of Melaleuca cajuputi Powell Essential Oils Fingerprint in Terengganu, Malaysia Using Chemometric Approach

Abdullah¹,

Juahir²,

Lananan³

et al. 2018

IJET

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“…The purpose of this analysis is to group age and type of drug into several clusters as this method is usual in classifying observations/samples or variables into clusters which have high homogeneity inside the class and high heterogeneity with other class according to selected criteria [4][5][6]. Ward's method was applied using Euclidean distances to measure similarity in HACA as it is proved to be a very effective method [7][8][9]. Result achieved from this analysis will be presented in dendogram, which it represent clusters and their proximity [10].…”

Section: Cluster Analysismentioning

confidence: 99%

Trend Detection of Drug Abuse Using Multivariate Analysis in Malaysia During the Years 2005 to 2015

Azizan¹,

Juahir²,

Toriman³

et al. 2018

IJET

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This study aims to dismantling number drug abuser, cohort of age and drug type effects to improve our understanding of these trends and suggested groups for target intervention by stakeholders to effectively reduce resultant harms. Data of the study involving number of drug abuser, cohort of age (8 groups: < 13, 13-15, 16-19, 20-24, 25-29, 30-34, 35-39, > 40) and drug type was obtained by reviewing annual report of National Anti-Drug Agency (NADA) of Malaysia during 2009 to 2015. Descriptive statistics were applied to give distribution rate and patterns of the data. Cluster analysis then performed to grouped age cohort and drug type into homogenous clusters. Mann – Kendall test were then applied at 5% interval level to identify any significant trends existed in all clusters. The result showed that age can be group into 3 clusters namely low-age cases, moderated-age cases and high-age cases, while for drug type 3 clusters were also created, low-drug type, moderate-drug type and high-drug type. Lastly, trend test shows that high-drug type (opiate) have very significant upward trend p < 0.05. Therefore, preventive strategies can be focus on young adult and opiate abused as it can greatly help reduce number of drug abuser in Malaysia.

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“…The temperature of Brunei Bay varies from 20°C up to 36°C due to climate changes between the northeast and southwest monsoon yearly. Additionally, this bay is being dominated by mangrove and nipah forest, palm oil plantation, logging and dense local settlements [47][48]. Other than that, Brunei Bay has a unique and diverse ecosystem due to a variety wildlife which has been inhabit the bay area namely dolphin, sea-cow, turtles, crocodiles, Proboscis monkey and many more.…”

Section: Study Areamentioning

confidence: 99%

“…The aims of this study were to define the sedimentation rate and sediment age of the collected sediment cores. Besides that, the present study also intended to investigate the possible pollutant sources into Brunei Bay area since this bay is well known with its unique and diverse ecosystem [47][48].…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Brunei Bay Sediment Cores Sedimentation Rate Using 210Pb Radiometric Dating Technique

Joseph

Ghazali

Shazili

et al. 2018

IJET

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The use of radioisotopes 210Pb and 226Ra in establishing the geochronology of pollutants in the sediment core and sediment dating is being widely used in the world. The present study was conducted in Brunei Bay region of Malaysian waters to define the sedimentation rate and sediment age as well as to investigate the possible sources of pollutants into this bay. Sediment core samples were cut by layers, dried and analyzed using High Purity Germanium (HPGe) Spectrometer. Results obtained marked the time interval of 1875, 1956, 1962 and 1945 for sediment core B5, B9, B13 and LB consecutively. Sediment core of B9 and LB showed higher sedimentation rate compared to B5 and B13 due to the rapid development of urban and industrial. The increasing of sedimentation rate over the last 25 years was in line with the increasing of human activities surround the bay. Additionally, the health and distribution of mangroves surround Brunei Bay were important to determine the sediment movement which will affect the sedimentation rate in the bay. Overall, by controlling human activities as well as sustaining the mangroves population, could maintain and preserve the natural and unique environment of Brunei Bay.

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Tracing the sources of lead (Pb) in Brunei Bay, Borneo by using integrated spectrometry ICP-MS and chemometric techniques

Cited by 20 publications

References 48 publications

Pattern Recognition of Melaleuca cajuputi Powell Essential Oils Fingerprint in Terengganu, Malaysia Using Chemometric Approach

Pattern Recognition of Melaleuca cajuputi Powell Essential Oils Fingerprint in Terengganu, Malaysia Using Chemometric Approach

Trend Detection of Drug Abuse Using Multivariate Analysis in Malaysia During the Years 2005 to 2015

The Evaluation of Brunei Bay Sediment Cores Sedimentation Rate Using 210Pb Radiometric Dating Technique

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