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Volume 5 Number 7 September 2020

Synthesis of a Number of Unsymmetrical Bridged Terphthaloyl Acetophenone Oxime Esters


Authors: Ramadan Ali Bawa ; Hana Mansoure Elmajdoub
Pages: 98-100
DOI: doi.org/10.32861/ajc.57.98.100
Abstract
A number of unsymmetrical bridged terphthaloyl acetophenone oxime esters has been synthesized throughout an esterification reaction between four different acetophenone oximes and the terphthaloyl chloride in a molar ratio of (2:1) under mild basic conditions. Spectroscopic techniques, such as IR, HNMR and mass spectrometer, were used to confirm the structures of the targeted oxime esters. The yields of the obtained oxime esters ranged from 80% to 95%.

Pesticide Residues in Pineapple Juice in Abidjan, Cote D’ivoire


Authors: AKE ASSI Yolande Epouse DATTE ; GNONSORO Urbain Paul ; KOUAKOU Konan Jean-Marie ; KPAN KPAN Kouakou Gains ; BIÉGO Godi Henri ; GNINGNINRI Hoglan Anne-Marie Lisette
Pages: 91-97
DOI: doi.org/10.32861/ajc.57.91.97
Abstract
The determination of pesticides in food products is an essential issue to guarantee food safety and minimize health risks of consumers. In this study, 30 pineapple juice samples were collected randomly from 30 seller through the city of Abidjan (Côte d’Ivoire) and analyzed for the determination of pesticide residues. The  aim  of  the  work  was  to  quantify  30 commonly  used  pesticides  (Metolachlor, Chlorpropham, Parathion-methyl, Chlorfenvinphos, Vinclozolin, Parathion-ethyl, Fenuron, Aldicarb, Metoxuron, Monuron, Methabenzthiazuron, Chlortoluron, Monolinuron, Isoproturon, Diuron, Metobromuron,  Metazachlor,  Buturon,  Linuron,  Prometryn,  Terbutryn,  Desisopropylatrazine,  Desethylatrazine,  Simazine,  Cyanazine,  Atrazine,  Propazine,  Terbuthylazine,  Metamitron,  Crimidine and  Metolachlor)  in real samples of pineapple juice.  The  method  used  for  the  determination  of  these  analytes in  the  complex  matrices  was high-performance  liquid  chromatography  with  UV/Visible detector. Results obtained indicate that 30% of the investigated pineapple juices samples are free of pesticides residues or have a level below Limit Of Detection......

Ecological Risk Assessment of Mineral and Heavy Metals Levels of Soil Around Auto Mechanic Village Wukari, Nigeria


Authors: E. A. Yerima ; A. U. Itodo ; R. Sha’Ato ; R. A. Wuana
Pages: 81-90
DOI: doi.org/10.32861/ajc.57.81.90
Abstract
Environmental contamination is one of the serious challenge facing humanity and other life forms on our planet today. contamination occurs when contaminating substances exceeds their natural levels or when natural resources are use at a rate higher than nature’s capacity to restore itself. This study determines the levels of mineral element and potential toxic metals namely:  P, K, Mg, Mn, Si, Fe, Zn, Cd, Pb and Al in agricultural soil around mechanic village Wukari-Nigeria.  by means of MP-AES (4210 MP-AES Agilent technologies) while their pollution indices by means of geo-accumulation index and contamination factor. The results reveals that the mean ± standard deviation abundance of mineral and heavy metals in the soil was: Fe (20723.64±153.71), Al (3753.80±30.54) K (368.13±2.17), Mg (298.05±3.88), Mn (231.97±0.74), P (221.22±5.47), Zn (184.83±0.47), Pb (86.29±0.31), Si (64.27±0.43) and Cd (1.33±0.06). There was generally a significant difference between the concentration in the test and control sample (P < 0.05). While pollution indices show moderate to very high contamination of the soil by zinc, lead and cadmium signalling higher potential risk in terms of mobility on acidification since the organic content is moderate and soil texture being sandy-loam usually characterise with moderate capacity to immobilize heavy metals. Lead contamination can result in neurological and hematological dysfunctions, renal and hepatic damages as well as reproductive disorders in the humans while cadmium is known to have effect on kidney.