Samples of gasoline engine oil (SAE 5W20) that had been exposed to various oxidation times were inspected with a UV-Visible (UV-Vis) spectrophotometer select the best wavelengths and wavelength ranges for distinguishing times. Engine samples subjected different thermal periods 0, 24, 48, 72, 96, 120, 144 hours, resulting in range total base number (TBN) levels. Each (190.5 – 849.5 nm) selected ...

A UV-visible rapid scan spectrophotometer (RSS) was coupled to a Au rotating disk electrode (RDE) for monitoring at near-normal incidence the reflection-absorption spectrum of the diffusion boundary layer in [Fe(CN)(6)](4)(-) aqueous solutions over a potential region in which [Fe(CN)(6)](4-) oxidizes, generating highly absorbing [Fe(CN)(6)](3-) (lambda(max) = 420 nm). Measurements were performe...

Derivative spectroscopy uses first or higher derivatives of absorbance with respect to wavelength for qualitative analysis and for quantification. The concept of derivatizing spectral data was first introduced in the 1950s, when it was shown to have many advantages. However, the technique received little attention primarily because of the complexity of generating derivative spectra using early ...

Cotton knitted fabrics were manufactured with different yarn types (conventional ring spun yarn and torque-free ring spun yarn) with different fibre types (combed cotton and combed Supima cotton) and yarn fineness (Ne30 and Ne40). These fabrics were then dyed with three types of dye (reactive, direct and sulphur dye) with three dye concentrations (0.1%, 1.0% and 5.0% on-weight of fabric (owf)) ...

1 Preface All products are continuously being improved for better performance. Spectrometers have developed in many ways since the introduction of simple and moderately priced Spectrophotometers which were commercially available from the mid 1950’s. 1 Such improvements have enabled SCINCO to manufacture PDA type UV-Vis. Spectrophotometers. The scope and performance of conventional single channe...

On-chip integration of optical detection units into the microfluidic systems for online monitoring is highly desirable for many applications and is also well in line with the spirit of optofluidics technology-fusion of optics and microfluidics for advanced functionalities. This paper reports the construction of a UV-Vis spectrophotometer on a microreactor, and demonstrates the online monitoring...

Metronidazole in METRONIDAZOLE I.V. Infusion 500mg/100ml was determined by Spectrophotometric method. Being a very simple, reliable and sensitive method was developed and adopted to perform the analysis of METRONIDAZOLE I.V. Infusion 500mg/100ml. The Spectrophotometric method described was found to be simple, sensitive and accurate. Therefore this could be applied for the determination of METRO...

Quantification of RNA is essential for various molecular biology studies. In this work, three quantification methods were evaluated: ultraviolet (UV) absorbance, microcapillary electrophoresis (MCE), and fluorescence-based quantification. Viral, bacterial, and eukaryotic RNA were measured in the 500 to 0.05-ng microl(-1) range via an ND-1000 spectrophotometer (UV), Agilent RNA 6000 kits (MCE), ...

A systematic study of the attenuation electromagnetic radiation in Nuclear Track Detectors (NTDs) is carried out. The gamma-ray, X-ray, UV, visible, and infrared NTDs are investigated using NaI(Tl) detector, Gas Electron Multiplier (GEM) UV-Vis spectrophotometer, FTIR spectrophotometer respectively. values some important parameters (e.g., optical depth, coefficient, etc.) three commercially ava...

UV radiation and organic matter (OM) composition are known to influence the species composition of bacterioplankton communities. Potential effects of UV radiation on bacterial communities residing in sediments remain completely unexplored to date. However, it has been demonstrated that UV radiation can reach the bottom of shallow waters and wetlands and alter the OM composition of the sediment,...