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ABSTRACT The concentration of six heavy metals and six of sixteen (16) US EPA priority polycyclic aromatic hydrocarbons (PAHs) in water, fish and sediment samples of the confluence of rivers Niger and Benue were investigated in triplicates using atomic absorption spectrophotometer (AAS) for the heavy metals determination and gas chromatography ...

ABSTRACT The synthesis of ten new alkynylated  derivatives of angular phenoxazine  and  alkynylated naphthoquinone    was   thoroughly   investigated.    The   first   intermediate,    6-chloro-5H- benzophenoxazin-5-one  was obtained  by the condensation  of  2-aminophenol  with 2,3- dichloro-1,4-  naphthoquinone  in  the  presence  of  anhydrous  sodium  tricarbonate  (IV)  . Thereafter,  the  intermediate  and  2,3-dichloro-1,4-naphthoquinone  were  each suggested ...

ABSTRACT In this study, a series of N-pyridin-3-yl substituted acetamide has been synthesized. The reaction of phenylsulphonyl chloride with various amino acids in basic medium yielded phenylsulphonamido alkanoic acid which, on chlorination with thionyl chloride, gave acid chloride derivatives of phenylsulphonamido alkanoic  acid  in  situ.  The  acid  chloride  derivatives  on ...

ABSTRACT The kinetics and mechanisms of the redox reactions of oxidant,   -adipato-di(N,N/- bis(salicylidene)ethylenediaminatoiron(III),,hereafter      denoted      as Fe2adi, with the thiols L-cysteine (LSH), thiourea (USH),  thioglycolicacid(GSH),2– mercaptobenzothiazole  (BTSH)   and  benzylmercaptan   (BSH)  have  been  studied spectrophotometrically  at  495  nm  in  aqueous  perchloric  acid,  I=0.01mol  dm-3 (NaClO4) and at 29  1oC. The stoichiometry of ...

ABSTRACT Heavy  metal  concentrations  and  degradation  efficiency  of  total  petroleum  hydrocarbons (TPHs) on environment in Ibeno Local Government Area, Akwa Ibom  State, Nigeria was investigated.  Experimental  design  method  was  adopted  for  this  study.  Fifteen  composite samples each of soil, leaves of Telfairia occidentalis, sediment and water were collected in December ...

AB STRACT The effect  of torrefaction temperature  and residence  time  on the fuel properties  of lignite,  biomass (coconut  shells and cassava peels) and their blends was investigated.  The samples were subjected  to three  torrecfaction  temperatures   (200,  260  and  300C)  and  at  two  residence  times  (10  and  20 minutes) using programmable ...

ABSTRACT The  highly nucleophilic  bridging  sulfide  centers  in  bis(μ-sulfido)tetrakis(triphenylphosphine) diplatinum(II),    enables  the  incorporation  of any organic  functionality  (R) through facile monoalkylation to form cationic complex +.  The organic electrophiles; N,N’-(2-dichloroethyl) piperazine-4-carboxi-amine,  N-(2-chloroethyl) morpholine- 4-carboxi-amine,    and   N-(2-chloroethyl)-1-methylpiperazine-4-carboxi-amine   derived    from isocyanate were synthesised by the reactions of piperazine, morpholine and  methyl ...

ABSTRACT The synthesis and characterization of zeolite and its application in adsorption of nickel from aqueous solution was investigated. Synthesis of zeolite was performed at 90 oC for 8 h. The size of the resulting crystals increased with an increase in the water content of the reaction mixture. The synthesized ...

ABSTRACT The roots of Dennettia tripetala and Milicia excelsa were analyzed for the presence of phytochemicals. Five different solvents, which include methanol, ethanol, ethyl acetate, butanol and water, were used for the extraction of the phytochemicals.The root of Dennettia tripetala contained alkaloids, terpenoids, flavonoids, saponins, phenols, steroids and glycosides in ...

ABSTRACT The active drug content and weight uniformity of five brands (A – E) of Amoxicillin Trihydrate capsules in Nsukka open drug market were evaluated to ascertain their quality assurance using UV visible spectroscopy and gravimetry. This study has shown that all the brands analyzed showed significant variations with respect ...

ABSTRACT The  divalent metal chelates of  Mg,Co,Cu and Zn  with 4-acetyl (hpmap), 4- benzoyl(hpmbp),4-butyryl(hpmbup),4-capyroyl(hpmcp),4-propiony (hpmprp)   and   4-palmitoyl(hpmpp)   derivatives   of   1-phenyl   -3-methyl pyrazol-5-one have been  synthesized  and characterized by  UV ,IR,    and conductivity  measurements.  It  is  shown  that  the  ligands  behaved  like bidentate enols, all forming neutral chelates  with  the  metal ...

ABSTRACT Dried and pulverised leaves of A. boonei De Wild (Apocynacea) were extracted using methanol for 48 h. The methanol  extract  obtained  was defatted  using  n-hexane  and  fractionated  using ethylacetate.   The  ethyl   acetate   fraction  of  the  extract   was   subjected   to  vacuum   liquid chromatography (VLC) in silica gel using gradients of ...

ABSTRACT Production   of carbon  black  from  novel  sources  like  spent  automobile  tyre,   anthracite  coal, furnace  soot  and graphite  rod  and subsequent  use  in the production  of offset  printing  inks  has been investigated.  Carbon black from these sources were obtained by pyrolysis  of shredded spent tyre and coal samples at 750-900°C ...

ABSTRACT Zeolite crystals were synthesized by mixing sodium silicate and sodium aluminate to obtain aluminosilicate gel which was further treated hydrothermally to obtain the final product. The zeolite crystals were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD result identified the synthesized crystals as zeolite z; ...

ABSTRACT The inhibitive effects of bamboo leaves extracts (BLE) on the corrosion of aluminum in 1M HCl were studied using weight loss, adsorption, thermodynamics  and kinetic  studies. The phytochemical  constituents  of the  BLE  were  tannins,  polyphenols,  flavonols,  terpenoids, sterols and alkaloids.  BLE was noted to contain  more of the  polyphenols ...

ABSTRACT 2-phenyl] iminomethyl]pheno 1   was synthesized from the condensation reaction of 1,3-diaminobenzene and 2-hydroxyzaldehyde  m dimethylformaldehyde  (DMF).  Its  coordination  characteristic  with  vanadium(III)  and vanadium(V)    complexes    was   studied    via,   UV/Visible,    IR   and   NMR    spectroscopy; stoichiometric,  melting  point  and  conductivity  determinations.  The  analytical  data  of these complexes  and the mode of bonding ...

ABSTRACT Five  species  of  Mushroom  namely  Termitomyces   robustus,  Agaricus  bisporus, Pleurotus tuber-regium, Amanita phalaoides and Amanita verosa were collected from eleven  locations  in  Uke,  Abatete,  Ideani,  Nnobi,  Nnewi  (Okpuno-egbu),  Nnewi (Umudim) and Ozubulu between 2009 and 2012 in Anambra State, Nigeria.   They were  kept  in  clean  collection  bags  and  identified ...

ABSTRACT Concentrations of 16 priority polycyclic Aromatic Hydrocarbons (PAHs) were determined in 30 brands of Nigerian and imported pastas in Nigerian market. The pasta samples were categorised into (1) noodles (2) spaghetti and (3) macaroni. Analysis were performed by GC – MS after soxhlet extraction of the sample and clean ...

ABSTRACT Synthesis   of twelve   O-arylated   diazabenzophenoxazine-5-one  and  its carbocyclic  analogue  is reported  in 46  -  99  % yields.    The  intermediates were  prepared  by  anhydrous  base  catalyzed  reaction  of 2,3-dichloro-1,4- naphthoquinone  with  4,5-diamino-6-hydroxyl-2-mercaptopyrimidine  and 2- aminophenol.   The  O-arylation   process   occurred   smoothly   in  non-polar solvent,   toluene    with   the   inexpensive    base,   KPO,   at    ...