ORCID Profile
0000-0002-9625-419X
Current Organisation
De La Salle University
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Publisher: American Chemical Society (ACS)
Date: 06-11-2013
DOI: 10.1021/EF4014604
Publisher: American Chemical Society (ACS)
Date: 04-11-2014
DOI: 10.1021/EF5020346
Publisher: American Chemical Society (ACS)
Date: 23-07-2014
DOI: 10.1021/EF500855W
Publisher: Elsevier BV
Date: 09-2019
Publisher: American Chemical Society (ACS)
Date: 08-09-2016
Publisher: Insight Society
Date: 15-06-2021
Publisher: IOP Publishing
Date: 07-2020
DOI: 10.1088/1742-6596/1593/1/012033
Abstract: Laguna lake is an important natural resource that provides agricultural and other uses such as transportation, recreation, and irrigation. Due to rapid changes in the land use near the west region of Laguna lake, surface water quality measurements are necessary. Using excitation-emission fluorescence spectroscopy, the optical characteristics of dissolved organic matter (DOM) in Cabuyao river were assessed. There are six s ling sites based on inflow and outflow of water from Cabuyao river and its tributaries. 3D excitation-emission matrices (EEMs) using Surfer v16 was utilized in the assessment of protein-like and humic-like fluorescence peaks. It was observed that the differences in the EEMs provided DOM composition, and its origin. A fluorescence index of approximately 1.18 showed that most of the s les are terrestrial in origin. In-situ water quality measurements such as dissolved oxygen, temperature, pH, and electrical conductivity. Hence, this study provides preliminary information on the possible use of fluorescence EEMs in providing DOM composition in natural waters.
Publisher: Elsevier BV
Date: 09-2023
Publisher: MDPI AG
Date: 15-03-2022
DOI: 10.20944/PREPRINTS202203.0205.V1
Abstract: A recent survey that determined heavy metal concentrations in an abandoned Hg mine in Palawan, Philippines, found the occurrence of Hg with As, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sb, Tl, V, and Zn. While the Hg originated from the mine waste calcines as supported by previous studies, the critical knowledge about the origin of the other heavy metals remains to be unknown. Our study investigated the sources of heavy metal pollution surrounding the abandoned Hg mine and assessed the soil and sediment quality, ecological risks, and health risks associated with these toxic metals. Multivariate analyses, such as hierarchical cluster analysis (HCA), principal component analysis (PCA), and Pearson correlation analysis, were used to identify the heavy metal sources from the results of a previous paper. Our results showed that Fe, Ni, Cr, Co, and Mn are associated with the ultramafic geology of the study, whereas As, Ba, Cd, Cu, Pb, Sb, Tl, V, and Zn are likely due to historical mining and processing of cinnabar from 1953-1976. The mine waste calcines were used as construction material for the wharf and as land filler for the adjacent communities. The modified contamination factor (mCdeg) showed that the coast of Honda Bay is highly contaminated, while the inland areas, including the rivers, are very- to ultra-highly contaminated. There is a considerable ecological risk associated with the heavy metals, wherein Ni, Hg, Cr, and Mn contribute an average of 46.3 %, 26.3 %, 11.2 %, and 9.3 % to the potential ecological risk index (RI), respectively. The overall mean hazard index (HI) for both adults (1.4) and children (12.1) exceeded 1, implying the probability of non-carcinogenic adverse effects. The mean total cancer risk over a lifetime (LCR) for both adults (1.19& times -3) and children (2.89& times -3) exceeded the tolerable threshold of 10-4, suggesting a potentially high risk for developing cancer mainly by Ni, Co, and Cr exposure.
Publisher: Elsevier BV
Date: 2014
Publisher: MDPI AG
Date: 31-07-2019
DOI: 10.3390/W11081593
Abstract: The Integrated Water System (IWS) offers alternative water and sanitation services that can potentially benefit rural communities experiencing water scarcity. The IWS described in this study comprises three systems: The Rainwater Harvesting System (RWHS), Water Treatment System (WTS), and Eco-Toilet System (ETS). RWHS and WTS make use of rainwater, which can be utilized for several domestic uses, especially during wet season. ETS has several benefits to users including promotion of environmental and public health, as well as food security. Despite the potential benefits of the IWS components, the perceived acceptance of its users threatens the success of its implementation. This study focuses on determining the significant factors that can influence the social acceptance of IWS in the Municipality of Mulanay, Quezon Province, Philippines. This study considers behavioral intention as an indicator of social acceptance of the IWS components. The framework of this study is based on the combined technology acceptance model and theory of planned behavior (C-TAM-TPB) concept. C-TAM-TPB was analyzed using Partial Least Square–Structural Equation Modeling (PLS–SEM). The result of the C-TAM-TPB evaluation reveals that the user’s attitude towards use (ATU), including its significant predictors, can promote behavioral intention towards use of the IWS components. This study can further improve the development of IWS projects.
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 09-2016
Publisher: Informa UK Limited
Date: 03-01-2023
Publisher: MDPI AG
Date: 15-02-2018
DOI: 10.3390/SU10020521
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 05-2023
Publisher: American Chemical Society (ACS)
Date: 24-07-2014
DOI: 10.1021/EF500806P
Publisher: Elsevier BV
Date: 04-2016
No related grants have been discovered for Lawrence Belo.