Asian Journal of Applied Chemistry Research <p style="text-align: justify;"><strong>Asian Journal of Applied Chemistry Research (ISSN: 2582-0273)</strong>&nbsp;aims to publish high-quality papers (<a href="/index.php/AJACR/general-guideline-for-authors">Click here for Types of paper</a>) in all areas of 'chemistry and its application'. The journal also encourages the submission of useful reports of negative results. This is a quality controlled,&nbsp;OPEN&nbsp;peer-reviewed, open access INTERNATIONAL journal.</p> Asian Journal of Applied Chemistry Research en-US Asian Journal of Applied Chemistry Research 2582-0273 Spatio-Temporal Study of Criteria Pollutants in Nigerian City <p><strong>Aims: </strong>An investigation of characteristic long term air pollutants known for temporal and spatial behaviors was conducted due to increased pollution scenarios in Nigerian cities as a result of deprived environmental enforcement of statutory obligations.</p> <p><strong>Study Design:</strong> One of the worlds’ most polluted cities (Onitsha lower basin) in Nigeria was selected for spatio-temporal study of three criteria pollutants combined with GIS and MATLAB alongside associated meteorological conditions during harmattan.</p> <p><strong>Methodology:</strong> 72-hourly analyses of the nine different locations having 4 sampling sites and 500 meters apart were done from December to February which generated over 19, 440 experimental data per quarter of each annual study.</p> <p><strong>Results:</strong> Upper Iweka/Nitel area recorded the highest concentration of SO<sub>2</sub> pollutant at (94.2 µg/m3) due to longer residence times and low wind mixing height. Borromeo hospital showed the least active NO<sub>2</sub> region but converges at points 1 due to North-east wind dissimilar to sampling points 1 having the lowest PM<sub>10</sub> distribution. Measured temperature parameter correlates inversely with relative humidity and precipitation. The GIS spatial representation corresponded to temporal variability of gaseous and particulate pollutants.</p> <p><strong>Conclusion:</strong> All sampled areas had AQI above 50; hence the study identified SO<sub>2</sub>, NO<sub>2</sub>, and PM10 as Primary pollutants of Onitsha lower basin.</p> L. C. Anyika C. O. Alisa A. U. Nkwoada A. I. Opara E. N. Ejike G. N. Onuoha ##submission.copyrightStatement## 2020-07-29 2020-07-29 1 13 10.9734/ajacr/2020/v6i330160 Phytochemical Screening, GC-MS Analysis and Antioxidant Activity of Three Medicinal Plants From Nigeria <p>Phytochemical screening, GC-MS analysis and antioxidant activity of some medicinal plants were investigated using standard methods. Leaves of <em>Gongronema latifolium</em>, <em>Petrocarpus mildbraedii,</em> and <em>Piper guineense </em>plants were prepared properly and used in the entire study. Results of phytochemical screening for the plants revealed the presence of tannins, saponins, alkaloids, phenolic compounds, reducing sugars amongst others at different concentrations. Results of GC-MS analysis for <em>G.latifolium</em> showed a total of thirty-three compounds of which Cyclohexano, 2-l(methlaminomethyl)-trans had the highest retention time, squalene had the highest molecular weight and phytol had the highest peak area. GC-MS result for <em>P.mildbraedii </em>revealed a total of twenty-three of which Acatamide,2,2,2-trichloro- had the highest retention time, Erucic acid had the highest molecular weight whereas n-Hexadecanoic acid the highest peak area. Only ten compound were observed in <em>P.guineense</em> of&nbsp; which Ethyl (3-hydroxyphenyl) carbamate had the highest retention time, Benzaminde, N-(4,5-dichloro-1,3-benzothiazol-2yl)-3,5-dimethoxy- had the highest molecular weight and Benzene, 1,2,3-trimethoxy-5-(2-propenyl)- has the highest peak area in <em>P. guineense</em>. The antioxidant activity of the plant extracts as assessed, followed the order <em>P.guineense</em> &gt;<em> G.latifolium</em>&gt;<em> P. mildbraedii</em> in comparative with ascorbic acid used as the control. The observed compounds become very important when the usefulness of these plants as medicinal plants are considered. They could as well be behind the antioxidant property of the plants in this study. This study has revealed the phytochemical screening, GC-MS analysis and antioxidant activity of some medicinal plants.</p> Ezekwe Ahamefula S. Ordu Kenneth S. Oruamabo Ralphael S. ##submission.copyrightStatement## 2020-08-07 2020-08-07 14 26 10.9734/ajacr/2020/v6i330162