A novel infrared spectrophotometric method for the rapid determination of petroleum hydrocarbons, and animal and vegetable oils in water

2012 ◽  
Vol 23 (1) ◽  
pp. 109-112
Author(s):  
Song Lin Tang ◽  
Yong Zhang ◽  
Sheng Zhong ◽  
Ai Min Li
Keyword(s):  
Vegetable Oils ◽  
Spectrophotometric Method ◽  
Petroleum Hydrocarbons ◽  
Rapid Determination

Rapid determination of sterols in vegetable oils by CEC using methacrylate ester-based monolithic columns

2008 ◽  
Vol 29 (22) ◽  
pp. 4603-4611 ◽  
Author(s):  
María Jesús Lerma-García ◽  
Ernesto F. Simó-Alfonso ◽  
Guillermo Ramis-Ramos ◽  
José M. Herrero-Martínez
Keyword(s):  
Vegetable Oils ◽  
Rapid Determination ◽  
Monolithic Columns

Rapid Determination of Alkaline Phosphatase Activity in Cheese

1977 ◽  
Vol 60 (6) ◽  
pp. 1397-1399 ◽  
Author(s):  
Dick H Kleyn ◽  
Steven T Goodman
Keyword(s):  
Alkaline Phosphatase ◽  
Alkaline Phosphatase Activity ◽  
Spectrophotometric Method ◽  
Quantitative Data ◽  
Rapid Determination ◽  
Screening Method ◽  
Spectrophotometric Measurement ◽  
Extraction Step ◽  
Visual Screening

Abstract A visual screening method specifying phenolphthalein monophosphate as the substrate was applied to cheese by analyzing the extract obtained with 7.5% butanol. In the extraction step, all of the alcohol was added at one time, and the mixture was filtered after mixing. Analysis of 10 samples of various types of cheese resulted in data identical to that obtained by the Scharer rapid method. Quantitative data obtained by dialysis of the butanol filtrate and spectrophotometric measurement of the phenolphthalein compared favorably (r = 0.96) with data obtained by the Scharer spectrophotometric method on 13 samples of cheese.

scholarly journals Rapid and Sensitive Spectrophotometric Method for the Determination of the Trace Amount of Thallium (III) in Water and Urine Samples by New Oxidative Coupling Reaction

2019 ◽  
Vol 53 (4) ◽  
Author(s):  
Padmarajaiah Nagaraja ◽  
Naef Ghllab Saeed Al-Tayar ◽  
Anantharaman Shivakumar ◽  
Ashwinee Kumar Shresta ◽  
Avinash K. Gowda
Keyword(s):  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Rapid Determination ◽  
Coupling Reaction ◽  
Molar Absorptivity ◽  
Urine Samples ◽  
Oxidative Coupling Reaction ◽  
Relative Standard ◽  
Student’S T

A very simple, sensitive and fairly selective direct spectrophotometric method is presented for the rapid determination of thallium(III) at trace level. The method is based on the oxidation of 2-hydrazono-3-methyl-2,3-dihydrobenzo[d]thiazole hydrochloride (MBTH) by thallium(III) in phosphoric acid medium to form a diazoniumcation, which couples immediately with 10,11-dihydro-5Hdibenzo[b,f]azepine (IDB) at room temperature giving a blue colored species having a maximum absorption at 660 nm. The reaction conditions and other important analytical parameters were optimized.The calibration curve was found to be linear over the range of 0.1-4 μg/mL with molar absorptivity of 4.5 × 104 L mol- cm-1 and Sandell’s sensitivity of 0.00454 μg cm-2. The relative standard deviation and limit of detection have been found to be 0.58% and 0.0147 μg/mL respectively. Almost all common anions and cations are found notto interfering in matrix level of the analytical process. The method has been successfully applied for the determination of thallium(III) in synthetic standard mixtures, water and human urine samples. The performance of proposed method was evaluated in terms of student’s t-test and variance ratio F-test, to find out the significance of proposed method over the reported methods.    

Improved ultraviolet spectrophotometric method for determination of nitrate in natural waters

2002 ◽  
Vol 2 (2) ◽  
pp. 213-221 ◽  
Author(s):  
N. Kishimoto ◽  
I. Somiya ◽  
R. Taniyama
Keyword(s):  
Water Quality ◽  
Spectrophotometric Method ◽  
Standard Error ◽  
Coefficient Of Variation ◽  
Natural Waters ◽  
Uv Light ◽  
Rapid Determination ◽  
The Other ◽  
Extreme Conditions

An improved UV spectrophotometric method for determination of nitrate in natural waters was proposed and the determination accuracy of the method was discussed in this study. As a result of estimation of the proposed method, adoption of 215 and 220 nm for detection of nitrate and interfering substances resulted in decreasing standard error to about a half of that of a conventional spectrophotometric method. One of the reasons was thought that the coefficient of variation of relative absorbance of interfering substances (rs) at 215 nm was smaller and more stable than that at 275 nm, which was used in the conventional method. The other reason inferred was that most of the interfering substances absorbed UV light at wavelengths of 215 and 220 nm. Although rs has to be renewed when targeted water quality is under extreme conditions, the procedure of the proposed method is very simple, namely only measuring two UV absorbances of a filtrated sample, and more accurate than the conventional spectrophotometric method. Consequently, the proposed method is available for rapid determination of nitrate in natural waters.

Rapid Determination of α-Tocopherol in Vegetable Oils by Fourier Transform Infrared Spectroscopy

2008 ◽  
Vol 2 (2) ◽  
pp. 120-127 ◽  
Author(s):  
Sandra D. Silva ◽  
Nuno F. Rosa ◽  
António E. Ferreira ◽  
Luís V. Boas ◽  
Maria R. Bronze
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Vegetable Oils ◽  
Rapid Determination ◽  
Fourier Transform Infrared
Sign in / Sign up

Export Citation Format

Share Document