April 2011
Evaluation of environmental sulphide by stabilisation of the initial product of the pentacyanonitrosylferrate(II)-sulphide reaction
Determination of environmental sulphide requires non-interference from other anions. Cyanide stabilisation of the transient red-violet product of the pentacyanonitrosylferrate(II)-sulphide reaction enables effective quantification of a 0.3 to 5 working range and a 0.2 μg ml-1 limit of detection. Sulphide in standard 2.0 μg ml-1 solutions was detected to within 2.4% standard deviation. The technique has...
April 2011
Development of urea formaldehyde and polyethylene waste as a copolymer binder for emulsion paint formulation
Urea formaldehyde (UF) resin was prepared and copolymerized with polyethylene waste (PE) to form (UF/PE) composite. The resulting composite was analyzed for formaldehyde emission and other physical properties such as viscosity, gel time, density, refractive index, melting point and moisture uptake. IR analysis of UF, PE and UF/PE showed chemical interaction between UF and PE resins. The level of formaldehyde emission...
April 2011
Some priority heavy metals in children toy’s imported to Nigeria
A total number of 51 toys manufactured from different countries were purchased and analysed to determine the level of lead, cadmium, chromium and nickel in the plastic components which was digested with concentrated HNO3 (CPSC-CH-E1002-08 method) and analyzed using atomic absorption spectrophotometer (AAS) to determine heavy metal concentration. The results obtained show that lead, cadmium, chromium and nickel were...
April 2011
Ecotoxicology tests on microalgae from Córdoba, Argentina
The eutrophication process involves important changes in the normal characteristics of water quality that may alter the balance between organisms. Microalgae particularly are very sensitive to changes. International standarized protocols were developed in order to detect water contaminants by their effects on microalgae, but it is important to evaluate contaminants over native species in our ecosystems. Using potassium...
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