top of page
This site was designed with the
.com
website builder. Create your website today.Start Now

SCIENTIFIC RESEARCH

Recent Research Projects

​

  • (2023) Food Safety in Philippine Tablea: Assessment of PAHs in cacao mass focusing on the practices of small scale producers in selected provinces

  • (2022-2024) Occurrences and Distribution of OCPs and OPs in Sediments and Water from Laguna Lake and Associated Health Risks

  • (2021) Ecotoxicological Risk and Source Assessment of PAHs in Pampanga River Sediments

  • (2020-2021) Investigating the Accumulation of PCBs in Laguna Lake, Philippines in Relation to the Commissioning of Power Plants in its Immediate Surroundings

  • (2019) Chemical Safety Aspects of Urban Farming Produce

  • (2018-2020) Developing Information Infrastructure for Managing Antibiotics and Endocrine Disrupting Substances  in Pampanga River Basin and its Coastal Environs: Maps, Transport Models and Bioindicators of Ecological and Public Health Risks

  • (2016-2018) Polycyclic Aromatic Hydrocarbons (PAHs) in Tissues of Homing Pigeons

  • (2013-2018) Monitoring of Chloramphenicol, Nitrofuran Metabolites and Malachite Green in Aquaculture Feeds, Bangus and Shrimps for Regulatory and Trade Purposes

  • (2017) Concentration ratios and molecular markers of PAHs in three Metro Manila ambient sites and from selected emission sources

  • (2013-2018) Global Atmospheric Sampling (PUF-Disk Sampling): Activities in the Philippines

  • (2016-2018)Perfluorinated Chemicals in Water, Sediments, Biota and Drinking Water in the Philippine Environment

  • (2015-2018) Integrating Ecotoxicological and Histopathological Information to Understand the Effects of Polychlorinated Biphenyl (PCB) Concentrations including its Metabolites in Stranded and By-caught Cetaceans in Philippine Waters

  • (2013-2015) Development of the Analytical Methods for Dialysis Water for DOH Accreditation

  • (2015) Polycyclic Aromatic Hydrocarbons (PAHs) in Size-Segregated Atmospheric Particulate Matter from a Traffic Site in Quezon City, Philippines

  • (2015)Monitoring of PFCs in Waters from Selected Background and Industrial Areas in the Philippines

  • (2013-2014) Persistent Organic Pollutants (POPs) in Air in East Asia

  • (2013-2014) Monitoring of PFOS in Environmental Waters in Pasig River and Selected Industrial Parks

Research Outputs

Publications

Valenzuela VG, Kwan CS, Responde AR, Ilagan AJR, Bondoc JL, Dom-ogen E. (2022). Initial Assessment of Heavy Metals in Urban Farming Produce. Science Diliman, 34:2, 5-37.

 

Takada, H., Koro, M., & Kwan, C. S. (2022). Marine Plastic Pollution: Chemical Aspects and Possible Solutions. In Overcoming Environmental Risks to Achieve Sustainable Development Goals (pp. 83-92). Springer, Singapore.

 

Ohgaki, T, Takada, H, Yoshida, R, Mizukawa, K, Yeo, B-G, Alidoust, M, Hirai, N, Yamashita, R, Tokumaru, T, Watanabi, I, Onwona-Agyeman, S, Gardiner, P, Eriksen, M, Kelly, JF, Rodriguez-Sierra, CJ, Colasse, L, Baztan, J, Barretto, FP, Izar, GM, Abessa, D, Zakaria MP, Kwan, CS, Saha, M, Ryan, PG, Weerts, S, Ofosu-Anim, J, Sabi, EB, Akita, LG, Tait, H, Eriksson, C and Burton, H. 2021. International pellet watch: Global monitoring of polybrominated diphenyl ethers (PBDEs) in plastic resin pellets. Environmental Monitoring and Contaminants Research 1: 75–90.

 

Bondoc JL, Aragones LV, and Kwan CS (2021). Development, Validation, and Application of a Three-way Cleanup Method for GC/MS Measurement of PCBs in Stranded Cetaceans in Philippine Waters. Philippine Journal of Science, 150 (5), 1093-1108.

 

Bondoc JL, Kwan CS, Valenzuela VG, Ilagan AJR. (2019). Strengthening Knowledge of Chemical Safety and Waste Management in Academic Laboratories: A Service-Learning Project of the UP NSRI Research and Analytical Services Laboratory for Public High Schools (A Laboratory Guide). Quezon City, Philippines: University of the Philippines Diliman.

 

Tamayo ET, Cayetano MG, Kwan CS, Müller K (2017). Miniaturized Solvent Extraction and Cleanup Method for Polycyclic Aromatic Hydrocarbons in Air Particulate Matter by Gas Chromatography/Mass Spectrometry. Journal of Environmental Science and Management, 20(2): 34-39.

 

Bondoc JL, Aragones LV, Masangkay JS (2017). Hematological, Macroscopic and Microscopic Findings in Two Stranded Whales (Mesoplodon densirostris and Kogia sima) and Possible Causes of Deaths. Philippine Journal of Veterinary Medicine, 54(1): 64-70.

 

Kwan CS and Takada H (2016). Release of additives and monomers from plastic wastes. In: Takada H, Karapanagioti H (eds). Hazardous Chemicals Associated with Plastics in the Marine Environment, Hdb Env. Chem, DOI 10.1007/698_2016_122, Springer International Publishing AG.

 

Santiago EC and Kwan CS (2015). POPs in selected rivers and bays in the Philippines. In: Ito, O, Ishikawa-Takashita E, Iino F, Shibata Y, Morita M (eds.) Monitoring and governance of persistent organic pollutants in Asia. United Nations University Office at the United Nations, New York, New York, pp. 169-193.

 

Kwan CS, Takada H, Boonyatumanond R, Kato Y, Mizukawa K, Ito M, Dung LQ, Zakaria MP, Santiago EC (2014). Historical occurrences of polybrominated diphenyl ethers and polychlorinated biphenyls in Manila Bay and in the upper Gulf of Thailand. Science of the Total Environment 470-471:427-437.

 

Kwan CS, Takada H, Mizukawa K, Saha M, Rinawati, Santiago EC (2013). Sedimentary PBDEs in urban areas of tropical Asian countries. Marine Pollution Bulletin 76:95-105.

 

Kwan CS, Takada H, Mizukawa K, Torii M, Koike T, Yamashita R, Rinawati, Saha M, Santiago, EC (2013). PBDEs in leachates from municipal solid waste dumping sites in tropical Asian countries: Phase distribution and debromination. Environmental Science and Pollution Research 20:4188-4204.

 

Shimizu A, Takada H, Koike T, Takeshita A, Saha M, Rinawati, Nakada N, Murata A, Suzuki T, Suzuki S, Chiem NH, Tuyen BC, Viet PH, Siringan MA, Kwan C, Zakaria, MP, Reunsang A. (2013). Ubiquitous occurrence of sulfonamides in tropical Asian waters. Science of the Total Environment 452-453:108-115.

 

Heskett M, Takada H, Yamashita R, Yuyama M, Itoh M, Geok YB, Ogata Y, Kwan C, Heckhausen, A, Taylor H, Powell T, Morishige C, Young D, Patterson H, Roberson B, Bailey E, Mermoz J. (2012). Measurement of persistent organic pollutants (POPs) in plastic resin pellets from remote islands: toward establishment of background concentrations for International Pellet Watch from the open ocean and remote urban beaches. Marine Pollution Bulletin 62:1683-1692.

 

Santiago EC and Rivas F (2012). Polychlorinated biphenyls in selected sites in Pasig River and Laguna Lake in the Philippines before and after a big flood event investigated under the UNU East Asia regional POPs monitoring project. Bulletin of Environmental Contamination and Toxicology 89(2), 407-411.

 

Hirai H, Takada H, Ogata Y, Yamashita R, Mizukawa K, Saha M, Kwan C, Moore C, Gray H, Laursen D, Zettler ER, Farrington JW, Reddy CM, Peacock EE Ward MW (2011). Organic micropollutants in marine plastics debris from the open ocean and remote urban beaches. Marine Pollution Bulletin 62:1683-1692.

 

Santiago EC, Cayetano MG (2011). Organochlorine pesticides in ambient air in selected urban and rural residential areas in the Philippines derived from passive samplers with polyurethane disks. Bulletin of Environmental Contamination and Toxicology 86(1):50-5.

 

Africa CR, Pascual AE, Santiago EC (2009). Total Mercury in Three Fish Species Sold in a Metro Manila Public Market: Monitoring and Health Risk Assessment. Science Diliman 21(1): 1-6.

 

Quilang JP, Guzman MC, Hitta-Catalan MH, Rubio RO, Jacinto SD, Santiago EC (2008). Effects of polychlorinated biphenyls (pcbs) on root meristem cells of common onion (Allium cepa L.) and on early life stages of Zebrafish (Danio rerio). Philippine Journal of Science 137:141-51.

 

Santiago EC and Kwan CS (2007). Endocrine-Disrupting Phenols in Selected Rivers and Bays in the Philippines. Baseline/Marine Pollution Bulletin 54:1031-1071.

 

Kwan CS, Santiago EC, Lapresca RF(2007). Levels of POPs pesticides in freshwater shrimps from the Pampanga River. Proceedings of the 22nd Philippine Chemistry Congress, Integrated Chemists of the Philippines, Tagaytay City, Philippines, April 12, 2007

 

Santiago EC and Kwan CS (2005). Organochlorine pesticide and polychlorinated biphenyls in surface and bottom waters of selected river and coastal sites in the Greater Manila Area. Proceedings of the Asian Regional Research Programme on Environmental Technology (ARRPET) National Workshop 2005, Management of Persistent Organic Pollutants (POPs) with Minor Issue on Alternative Sludge Management in the Pulp and Paper Industry. DLSU-CSB Angelo King International Center, Manila, Philippines, February 18, 2005, 38-50.

 

Santiago EC and Kwan CS (2003). Internal validation of an analytical method applied to the procedures for organochlorine pesticides, phenols and phthalates, Proceedings of the KJIST-UNU-UNESCO International Workshop on Regional Environmental Quality in the East Asian Coastal Hydrosphere:  Environmental Quality Guidelines and Capacity Development, Kwangju Institute of Science and Technology, Gwangju, Korea.

 

Kwan CS, Lamorena RB, Santiago EC (2003). Chemical waste management of NSRI, www.nsri.upd.edu.ph/rasl/cwm.

 

Santiago EC (1997). The levels and distribution of polycyclic aromatic hydrocarbons (PAH) contamination in bottom sediments in Manila Bay. Science Diliman 9: 1&2, 16-28.

 

Vicente-Beckett, VA, Pascual CB, Kwan, CS, Beckett R (1991). Levels and distribution of trace metals in sediments of Laguna Lake (Philippines) and its tributary rivers. Intern. J. Environ. Anal. Chem., 45: 101-116.

Paper Presentation

Bondoc JL, Kwan CS, Aragones LV, Masangkay JS.  "Current Knowledge, Novelties, Applications, Gaps and Future Directions in Philippine Marine Mammal Toxicology". 7th Philippine Marine Mammal Stranding Network National Symposium, Naga City, Bicol. October 2019.

 

Bondoc JL, Kwan CS, Aragones LV, Masangkay JS.  "PCBs and Associated Effects in Stranded Cetaceans in the Philippines". 3rd Asian Marine Mammal Stranding Network Symposium and Workshops, Kaohsiung, Taiwan. September 2019.

 

Kwan CS, Manalang KO, Cristobal JO, Valenzuela VG. "Perfluorinated compounds in the Philippine environment focusing on Manila Bay and Laguna Lake". 39th International Symposiumon Halogenated Persistent Organic Pollutants (DIOXIN 2019), Kyoto, Japan. August 2019.

 

Bondoc JL, Kwan CS, Aragones LV, Masangkay JS.  "Congener-specific Accumulation of PCBs, Toxicity Assessment and Associated Histopathologies in Cetaceans from Philippine Waters".  Pure and Applied Chemistry International Conference, Bangkok, Thailand. February 2019.

​

Cristobal JO, Kwan CS. "In-House Method Validation of Chloramphenicol in Shrimps Using LC-MS/MS". Pure and Applied Chemistry International Conference, Bangkok, Thailand. February 2019.

 

Bondoc JL, Kwan CS, Aragones LV, Masangkay JS.  "Risk-based Assessment of PCB Contamination in Philippine Cetaceans: Their Toxic Equivalents and Histopathological Findings". 6th National Philippine Marine Mammal Stranding Network Symposium, Tacloban City. October 2018.

 

Bondoc JL, Kwan CS, Aragones LV. "Polychlorinated Biphenyls as POPs and their   Environmental Toxicity. In-Service Education: Persistent Organic and Persistent Pollutants in the Environment". Department of Biology, Benguet State University. June 2018.

 

Bondoc JL, Kwan CS, Aragones LV. "Banned PCBs – How Much Is Left Out There? Results from Stranded Dolphins and Whales in the Philippines". 33rd Philippine Chemistry Congress. Philippine International Convention Center, Manila, Philippines. May 2018.

 

Bondoc JL and Kwan CS. "Assuring the Quality of Analytical Data: PCBs in High-Fat Matrices". 33rd Philippine Chemistry Congress. Philippine International Convention Center, Manila, Philippines. May 2018.

 

Kwan CS, Manalang KO, Cristobal JO, Valenzuela VG. “Initial assessment of PFCs inputs in Manila Bay and Laguna Lake, Philippines”. Pure and Applied Chemistry International Conference 2017: Green Convergence on Chemical Frontiers”, Central Government Complex Hotel and Convention Centre, Chaeng Watthana, Bangkok, Thailand, 2 February 2017.

 

Bondoc JL, Kwan CS, Aragones LV, Masangkay JS. “Do chlorinated pollutants still pose toxic threats to marine mammals?” 4th National Philippine Marine Mammal Stranding Network Symposium, Vigan, Ilocos Sur, October 2016.

 

Tamayo EGT, Cayetano MG, Kwan CS, Müller K, Wiedensohler A, Herrmann H. “Polycyclic aromatic hydrocarbons (PAHs) in air particulate matter from a traffic site in Quezon City”. 17th IUAPPA World Clean Air Congress and 9th CAA Better Air Quality Conference, Busan, South Korea, 29 August 2016.

 

Kwan CS, Manalang KO, Valenzuela VG. “Monitoring of PFCs in the Philippines: 2015”. UNU-IAS Shimadzu Project Meeting: Monitoring Management of POPs in Asia Phase VII, Shimadzu Asia Pacific Pte. Ltd., Singapore, 12 November 2015.

 

Bondoc JL, Masangkay JS, Aragones LV. “Preliminary Findings of an On-going Research on Cetaceans Found Stranded in Philippine Waters”. 3rd Philippine Marine Mammal Stranding Network National Symposium, Camayan Resort, Subic, Philippines, October 2015.

 

Bondoc JL, Paran FJ, Aragones LV. “Sampling Strategies and Tissue Biobank: Favoring Quality & Innovation for the Philippine Marine Mammal Research & Stranding Laboratory”. 3rd National & 1st International Conference & Workshop on Environmental Science. Ateneo de Manila University, Quezon City, November 2014.

 

Kwan CS. “PBDEs in our midst: Potential dilemma of tropical Asian Countries”. 50th Anniversary Symposium of the UP NSRI: “Celebrating Research Productivity: 50 Years and Beyond”, UP NSRI, June 19, 2014.

 

Kwan CS, Takada H, Mizukawa K, Saha M, Rinawati, Yamashita R, Boonyatumanond R, Santiago EC. “Polybrominated Diphenyl Ethers (PBDEs): Occurrence and debromination in tropical Asian countries”. International Session in the 23rd Symposium on Environmental Chemistry, Kyoto, Japan May 14, 2014.

 

Santiago EC, Kwan CS, Rivas F, Arancillo MN. “Persistent organic pollutants (POPs) in selected rivers and bays in the Philippines”. SETAC Asia Pacific Annual Meeting, Kumamoto, Japan, September 27, 2012.

 

Kwan, CS, Santiago EC, Lapresca RF.  “Levels of POPs pesticides in freshwater shrimps from the Pampanga River”. 22nd Philippine Chemistry Congress,  DAP Convention Center, Tagaytay City, April 12, 2007.

 

Santiago EC, Kwan CS, Lapresca RF. “POPs pesticides in water and shrimps in selected rivers in the Philippines”. UNU International Symposium on Persistent Organic Pollutants (POPs) in Asia: Its Status and Future, UP NSRI, UNU, Shimadzu Corp. Japan, UP NISMED Conference Hall, Universtiy of the Philippines, Diliman, Quezon City, Philippines, November 7, 2006.

 

Kwan CS and Santiago EC. “Levels of some Organic EDCs in selected water bodies of the Philippines”. Philippine Society of Oncology, Inc. 7th Midyear Convention “Cancer and the Environment”, Mount Malarayat Golf and Country Club, Lipa City, May 27, 2006.

 

Kwan CS and Santiago EC. “Internal validation of a GC/MS procedure for organochlorine pesticides in water and the levels of OCPs in selected coastal and river systems in the Philippines”. 19th Philippine Chemistry Congress, Iloilo City, May 25, 2004.

 

Kwan CS. “Organic EDCs in the Philippine hydrosphere, UNU monitoring project”. Seminar on “Endocrine Disrupting Compounds (EDCs) in the Philippine Environment”. NSRI, University of the Philippines, Diliman, Quezon City, Philippines, June 25, 2003.

 

Kwan, CS, Santiago EC, Concepcion FP, Obena RAP. “Some EDCs in selected coastal waters by GC/MS”. Exhibitors’ Lectures in the Asia-Pacific Conference on Analytical Science, 18th Philippine Chemistry Congress, Expo Kimika 2002, Megatrade Hall 2, Bldg. B. SM Megamall, Mandaluyong City, February 21, 2002.

 

Kwan CS. “Waste management in the laboratory (Chemical waste management system at NSRI)”. Seminar/Workshop on Management of Potentially Harmful Biological and Chemical Agents in UP Diliman, Quezon City, Philippines, February 25, 1999.

 

Kwan CS. “The fate of arsenic in the aquatic Environment”. International Symposium on Trace Metals and Nitrate Accumulation in Terrestrial and Aquatic Systems as Environmental Pollution Problems, Makati City, Philippines, December 8, 1998.

 

Kwan CS, Gonzales BP, Ang ME. “Towards a waste management system for NSRI: Methods development for the treatment and disposal of chemical wastes”. 4th NSRI Research Symposium, Quezon City, Philippines, March 13, 1998.

 

Kwan CS, Pascual CB, Jacinto GS. “Inorganic arsenic Species in Manila Bay (Philippines) using selective hydride generation-atomic absorption spectrophotometry”. ASEAN-Canada Cooperative Programme on Marine Science Phase II:  Conference on ASEAN Marine Environmental Management, Penang, Malaysia, June 26, 1996.

Poster Paper Presentation

Valenzuela, VG, Kwan, CS, Manalang, KO, Cristobal, JO. “Determination of Perfluorinated Compounds in Selected Tributary Rivers of Manila Bay and Laguna Lake”. 32nd Philippine Chemistry Congress, Puerto Princesa City, Palawan, May 31-June 2, 2017.

 

Tamayo, GT, Cayetano MG, Kwan CS, Müller K, Wiedensohler A, Herrmann H. “Method Development for Quantifying Polycylic Aromatic Hydrocarbons in Size-Segregated Atmospheric Particulate Matter from a Traffic Site in Quezon City, Philippines”. 13th UNU-GIST Joint Symposium: Environmental Challenges for Urban Cities, Manila, Philippines, November 11-12, 2015.

Casiguran C, Bondoc JL, Aragones LV. (October 2015). Protocols for Collection of Biological Samples: Strengthening the Efforts on Marine Mammal Research in the Philippines. 3rd Philippine Marine Mammal Stranding Network National Symposium, Camayan Resort, Subic, Philippines, October 2015.

 

Kwan CS, Pascual CB, Jacinto GS. “Levels of Inorganic Arsenic Species in Manila Bay Using Selective Hydride Generation Atomic Absorption Spectrophotometry”.  Science and Technology Centennial Celebration and the 19th NAST Annual Scientific Meeting, Manila, Philippines, July 9-10, 1997

 

Kwan CS, Pascual CB, Jacinto GS. “Arsenic Species in Manila Bay”. 65th Asian Chemistry Congress, Manila, Philippines, May 1995.

 

Kwan CS and Pascual CB.  “Arsenic Speciation in the Marine Environment Using AAS Methods”. 10th Philippine Chemistry Congress,Tagaytay City, Philippines.May 26-28, 1994.

bottom of page