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16. Security risk assessment and management in chemical plants: Challenges and new trends

Author

Khakzad, N. (author), Martinez, Imee Su (author), Kwon, Hyuk-Myun (author), Stewart, Constantine (author), Perera, Rohan (author), Reniers, G.L.L.M.E. (author), Khakzad, N. (author), Martinez, Imee Su (author), Kwon, Hyuk-Myun (author), Stewart, Constantine (author), Perera, Rohan (author), and Reniers, G.L.L.M.E. (author)

Abstract

he present study is to point out the outcomes of the Sem-inar on the Chemical Weapon Convention and Chemical Safety and Security Management for Member States in the Asia Region held by Organization for the Prohibition of Chemical Weapons in Doha, Qatar, in February 2017. The seminar was aimed at supporting chemical safety and secu-rity (CSS) management in the chemical industry in Asian countries. Overall goal was to sensitize States Parties to the new approaches that can be adopted in relation to CSS management, with a particular focus on providing assis-tance to small and medium-sized enterprises. This article reflects the observations made by keynote speakers via their interaction with participants from Asian State Parties dur-ing presentations’ questions & answers sessions and follow-ing workshops. The article is an attempt to highlight the challenges in security risk assessment and management of chemical facilities and discuss some new trends for further improvements., Safety and Security Science

Published
2017
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18. Insights on the Molecular Characteristics of Molecularly Imprinted Polymers as Monitored by Sum Frequency Generation Spectroscopy

Author

Obiles, Romelyn, Premadasa, Uvinduni I., Cudia, Paul, Erasquin, Uriel Joseph, Berger, Jenna M., Martinez, Imee Su, and Cimatu, Katherine Leslee Asetre

Abstract

Sensing in molecularly imprinted polymers (MIPs) requires specific interactions of the imprinted polymer and the approaching template molecule. These interactions are affected by the morphology of the polymer surface, the affinity of the template molecule to the polymer network, and the steric approach. In this particular study, a template molecule, metronidazole, is studied with respect to the typically used methacrylic acid-based imprinted polymer using a combination of bulk and surface techniques. The resulting infrared (IR) spectra exhibited the presence of the template molecule in the polymer matrix as well as their efficient removal after washing. Dipping of the MIP according to what is expected of facile sensing in an aqueous solution of metronidazole did not show any presence of the template molecule in the bulk of the MIP, as observed by IR spectroscopy. However, using sum frequency generation (SFG) spectroscopy, the CH aromatic stretch of the imidazole ring positioned at ∼3100 cm–1was observed at the polymer surface, including its inner pores or cavities, and at the buried polymer-fused silica interface after dipping. SFG studies have also shown the vibrational signatures of the polymer matrix, the presence of the template molecule on the surface, and the detection of residual template molecules after washing. Increasing the washing time to 50 min has proven to be less effective than increasing the washing cycles to three. However, after the third cycle, reorganization of the polymer matrix was evident as also the complete removal of the template molecule. The observed changes from the acquired images using scanning electron microscopy and atomic force microscopy show the structural morphologies of MIPs and a good distribution of the pores across the MIP surface. The study demonstrates the importance of combining both bulk and surface characterization in providing insight into the template molecule–polymer network interactions.

Published
2020
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19. Security risk assessment and management in chemical plants: Challenges and new trends.

Author

Khakzad, Nima, Martinez, Imee Su, Kwon, Hyuck‐Myun, Stewart, Constantine, Perera, Rohan, and Reniers, Genserik

Subjects
RISK assessment, CHEMICAL industry, CHEMICAL plants, CHEMICAL weapons, SAFETY standards
Abstract

The present study is to point out the outcomes of the Seminar on the Chemical Weapon Convention and Chemical Safety and Security Management for Member States in the Asia Region held by Organization for the Prohibition of Chemical Weapons in Doha, Qatar, in February 2017. The seminar was aimed at supporting chemical safety and security (CSS) management in the chemical industry in Asian countries. Overall goal was to sensitize States Parties to the new approaches that can be adopted in relation to CSS management, with a particular focus on providing assistance to small and medium‐sized enterprises. This article reflects the observations made by keynote speakers via their interaction with participants from Asian State Parties during presentations' questions & answers sessions and following workshops. The article is an attempt to highlight the challenges in security risk assessment and management of chemical facilities and discuss some new trends for further improvements. © 2017 American Institute of Chemical Engineers Process Saf Prog 37: 211–220, 2018 [ABSTRACT FROM AUTHOR]

Published
2018
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27. Nafion-based optical sensor for the determination of selenium in water samples

Author

Coo, Lilibeth dlC. and Martinez, Imee Su

Subjects
*CHEMICAL detectors, *SELENIUM, *LIGANDS (Biochemistry), *POTASSIUM
Abstract

An optical chemical sensor responsive to selenium (SeO32-) in water samples was developed. Its matrix was nafion membrane suffused with an organic ligand p-amino-p’-methoxydiphenylamine or variamine blue (VB). The method of analysis was flow injection (FI) where in the membrane was fixed in a flow-through demountable measuring cell and connected to a computer-controlled simple spectrophotometer.Variamine blue was previously established to determine amounts of selenium in water and other media by means of a spectrophotometer. The method involved reacting selenite with potassium iodide to generate iodine gas, which reacts with variamine blue to form a colored species.Experimental results showed the optrode to be an effective tool in analyzing the selenium content of water samples particularly for remote or in situ applications. Interference studies proved that the method is free of intervention from tested ions. [Copyright &y& Elsevier]

Published
2004
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