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  1. Toxic release consequence analysis tool (TORCAT) for inherently safer design plant
    Shariff AM, Zaini D
    J Hazard Mater, 2010 Oct 15;182(1-3):394-402.
    PMID: 20633985 DOI: 10.1016/j.jhazmat.2010.06.046
    Many major accidents due to toxic release in the past have caused many fatalities such as the tragedy of MIC release in Bhopal, India (1984). One of the approaches is to use inherently safer design technique that utilizes inherent safety principle to eliminate or minimize accidents rather than to control the hazard. This technique is best implemented in preliminary design stage where the consequence of toxic release can be evaluated and necessary design improvements can be implemented to eliminate or minimize the accidents to as low as reasonably practicable (ALARP) without resorting to costly protective system. However, currently there is no commercial tool available that has such capability. This paper reports on the preliminary findings on the development of a prototype tool for consequence analysis and design improvement via inherent safety principle by utilizing an integrated process design simulator with toxic release consequence analysis model. The consequence analysis based on the worst-case scenarios during process flowsheeting stage were conducted as case studies. The preliminary finding shows that toxic release consequences analysis tool (TORCAT) has capability to eliminate or minimize the potential toxic release accidents by adopting the inherent safety principle early in preliminary design stage.
  2. Cumulative impact assessment of hazardous ionic liquids towards aquatic species using risk assessment methods
    Khan MI, Mubashir M, Zaini D, Mahnashi MH, Alyami BA, Alqarni AO, et al.
    J Hazard Mater, 2021 08 05;415:125364.
    PMID: 33740721 DOI: 10.1016/j.jhazmat.2021.125364
    In the present research work, a comprehensive tool for cumulative ecotoxicological impact assessment of ionic liquids (ILs) to aquatic life has been constructed. Using the probabilistic tool, impact of individual ILs to a group of aquatic species is assessed by chemical toxicity distributions (CTDs). The impact of group of ILs to individual aquatic species is assessed by species sensitivity distributions (SSDs). Acute toxicity data of imidazolium ILs with chloride (Cl-), bromide (Br-), tetrafluoroborate (BF4-), and hexafluorophosphate (PF6-) anions are used in CTD and SSD. Allowable concentrations for a group of Imidazolium ILs with the same mode of action (SMOA) to five aquatic species; Daphnia magna, Vibrio fischeri, Algae, Zebrafish, and Escherichia coli are estimated by CTDs. It has been concluded that 1-Butyl-3-methylimidazolium chloride (BMIMCl) possess the lowest risk at an acceptable risk value of 750 × 10-5 mmol/L which is 12% less than that of OMIMCl. Furthermore, the sensitivities towards the aquatic species reveal that from the studied ILs, BMIMBF4 with an acceptable risk value of 3200 × 10-5 mmol/L is the most suitable IL towards the selected aquatic species. Hence, current work provides cumulative allowable concentrations and acceptable risk values for ILs which release to aquatic compartment of ecosystem.
  3. A nationwide, multihospital, cross-sectional, self-reported study: Knowledge, attitude and behaviour concerning the use of personal protective equipment among healthcare workers during the COVID-19 pandemic in Malaysia
    Sahdi H, Zuraidi NF, Redzuan-Hafiz-Boon KI, Abang-Ahmad-Zaini DNA, Ramlee MS
    Med J Malaysia, 2023 Mar;78(2):218-224.
    PMID: 36988534
    INTRODUCTION: Personal protective equipment (PPE) is crucial in reducing the risk of hospital-acquired COVID-19 as health care workers (HCW)s are highly exposed to the virus during the management of patients with COVID-19. This study assesses the knowledge, attitude and behaviour of the HCWs towards the use of PPE during the COVID-19 pandemic in Malaysia.

    MATERIALS AND METHODS: This is a nationwide, online-based cross-sectional study utilising a self-administered questionnaire that was distributed to tertiary hospital HCWs in Malaysia, conducted between June and August 2020.

    RESULTS: Forty-eight physicians, 66 nurses and 79 medical assistants participated in this study. 73.6% correctly recognised PPE components while 40.4% revealed correct hand hygiene practices and approximately 20% had misconceptions about the proper usage of PPE. Although 78.8% disclosed high compliance, 37.3% perceived that PPE protocol interferes with patient care. HCWs have suboptimal knowledge levels of hand hygiene. Age and poor behaviour were the independent predictors of good compliance with PPE.

    CONCLUSION: This study highlights the necessity to analyse discrepancies in PPE practice among HCWs and its contributing elements. Recognised barriers should be addressed to narrow the gap between knowledge, attitude and behaviour to improve compliance. The study findings would assist in developing an improved disease transmission control and prevention training protocols for HCWs as a preparation for possible infectious outbreaks in the future.

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