Asian Journal of Chemical Sciences <p style="text-align: justify;"><strong>Asian Journal of Chemical Sciences (ISSN: 2456-7795)</strong> aims to publish high quality papers (<a href="/index.php/AJOCS/general-guideline-for-authors">Click here for Types of paper</a>) in all aspects of Chemical Sciences. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer reviewed, open access INTERNATIONAL journal.&nbsp;</p> en-US (Asian Journal of Chemical Sciences) (Asian Journal of Chemical Sciences) Thu, 26 Mar 2020 07:47:55 +0000 OJS 60 Human Health Risk Assessment of Trace Metals in Water from Cross River Estuary, Niger Delta, Nigeria <p>The aim of this study was to determine the levels of some trace metals in water from Cross River estuary (CRE) and estimate the human health risk associated with water from the estuary via ingestion pathway and dermal contact. The trace metals in water were determined using atomic absorption spectrophotometer and the human health risk assessment of the trace metals was carried out using models stipulated by United States environmental Protection Agency (USEPA). The range for the results in mg/l was as follows: Pb (0.193- 0.632), Cd (0.118 - 1.084), Ni (0.048 -0.632), Fe (0.056 - 0.921), Zn ( 0.063 - 0.242), Cu(0.072 - 0.146). All the investigated metals were above the WHO limit except zinc and copper. The target hazard quotient (THQ) via ingestion pathway for Pb, Cd and Ni were higher than unity. Also, the hazard indices for all the investigated metals in all the study sites were higher than unity. The target hazard quotient and Hazard index via dermal pathway were less than one for all the metal investigated, except Cd at Ebughu. Regular monitoring and minimization of anthropogenic activities resulting in elevated metal concentration is recommended.</p> Etuk, Bassey A., Udiong, Daniel S., Akpakpan, Aniekan E. ##submission.copyrightStatement## Thu, 26 Mar 2020 00:00:00 +0000 Structural Characterization of Cure Bio-based Phenol Formaldehyde Wood Adhesive <p>Bio-phenol formaldehyde (BPF) resole resins were characterized by liquid-state <sup>13</sup>C Nuclear Magnetic Resonance (NMR) spectroscopy. The liquid <sup>13</sup>C NMR analysis indicated that the condensation reactions between the bark phenolic compounds and the formaldehyde occurred during the synthesis of the resins. Methylene ether bridges in the resins were more pronounced in the BPF resin when compared to the PF resin system. The liquid-state <sup>13</sup>C NMR study revealed significant differences in the resins structures induced by the inclusion of bark-phenolic components. The bark-phenolic components favored the formation of <em>para-ortho</em> methylene linkages in the BPF resins and also enhanced the cure rate of the BPF resin system.</p> Y. B. Olayiwola ##submission.copyrightStatement## Mon, 30 Mar 2020 00:00:00 +0000