Improved method for spectrophotometric determination of ruthenium using 1,10-phenanthroline: application for analysis of complex compounds

2018 ◽  
Vol 10 (42) ◽  
pp. 5078-5083 ◽  
Author(s):  
Adnan Zahirović ◽  
Irnesa Osmanković ◽  
Emir Turkušić ◽  
Emira Kahrović
Keyword(s):  
Spectrophotometric Determination ◽  
Complex Compounds ◽  
Improved Method ◽  
Accurate Analysis ◽  
Ruthenium Tetroxide

A day-to-day fast, cheap and accurate analysis of ruthenium in complex compounds without forgoing distillation of ruthenium tetroxide was conducted.

Spectrophotometric Determination of Thiabendazole in Feeds

1965 ◽  
Vol 48 (2) ◽  
pp. 288-295
Author(s):  
C R Szalkowski ◽  
J Kanora
Keyword(s):  
Hydrogen Sulfide ◽  
Spectrophotometric Determination ◽  
Coefficient Of Variation ◽  
Zinc Dust ◽  
Improved Method ◽  
Subsequent Oxidation ◽  
Color Development ◽  
Thiazine Dye

Abstract An improved method has been developed for thiabendazole in feeds. Thiabendazole is extracted from the feed with 0.2N HCl in 50% methanol; interfering substances are removed by making the extract alkaline and extracting into chloroform. The thiabendazole is re-extracted with dilute HCl; the solution is reduced with zinc dust in the presence of p-phenylenediamine to form a hydrogen sulfide complex. After subsequent oxidation with ferric solution to form a thiazine dye, the dye is extracted into n-butanol and measured at 605 mμ. More than 30 commercial unmedicated cattle and swine feeds show an apparent thiabendazole content of 0.00006–0.00044%. Recoveries on feeds made to contain 0.0025–10.0% thiabendazole ranged from 97.6 to 106.6%, with a coefficient of variation of 2.44%. In studies of 30 other drugs added to feeds, only nithiazide, Enheptin, and sulfathiazole interfere. Many variables involved in the color development were studied. The method gives the most accurate and reproducible results on solutions containing 0.2–2.0 μg thiabendazole/ml.

An Improved Method for Measuring Blood Concentrations of Phenylpyruvic Acid

1971 ◽  
Vol 17 (5) ◽  
pp. 378-381 ◽  
Author(s):  
S P Coburn ◽  
J D Mahuren ◽  
R W Fuller
Keyword(s):  
Blood Plasma ◽  
Diurnal Rhythm ◽  
Improved Method ◽  
Spectrophotometric Measurement ◽  
Phenylpyruvic Acid ◽  
Accurate Analysis ◽  
Blood Concentrations ◽  
Borate Complex ◽  
In Blood Plasma

Abstract We describe an improved determination of phenylpyruvic acid (PPA) in blood plasma by ultraviolet spectrophotometric measurement of an enol— borate complex. Sensitivity and recovery are well suited for accurate analysis in the range of 1.25 to 25 mg/liter. Sera from 10 fasting phenylketonuric subjects averaged 15.3 mg/liter (range, 4.8 to 25.0 mg/liter). A pronounced diurnal rhythm in plasma PPA, with peak concentrations occurring between noon and 6 p.m., was detected in patients with untreated phenylketonuria.

scholarly journals Improved Method on the Spectrophotometric Determination of Silver with Thiothenoyltrifluoroacetone

1974 ◽  
Vol 94 (8) ◽  
pp. 1025-1027 ◽  
Author(s):  
MASAKAZU DEGUCHI ◽  
MICHIYUKI HARADA ◽  
MIKIO YASHIKI
Keyword(s):  
Spectrophotometric Determination ◽  
Improved Method
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