Tungstic Acid

2021 ◽  
Keyword(s):  
Tungstic Acid

scholarly journals A Method for Preparing Tungstic Acid Sol and its Properties

1966 ◽  
Vol 87 (2) ◽  
pp. 118-123,A7 ◽  
Author(s):  
Kunio FURUSAWA ◽  
Sei HACHISU
Keyword(s):  
Tungstic Acid

DETERMINATION OF GLUCOSE IN FISH BLOOD: A MODIFICATION OF THE FOLIN–MALMROS MICROPROCEDURE

1958 ◽  
Vol 36 (11) ◽  
pp. 1121-1124 ◽  
Author(s):  
Leonard R. Murrell ◽  
Paul F. Nace
Keyword(s):  
Blood Glucose ◽  
Prussian Blue ◽  
Tungstic Acid ◽  
Sodium Lauryl Sulphate ◽  
Blood Proteins ◽  
Colorimetric Measurement ◽  
Efficient Separation ◽  
Fish Blood

A modification of the Folin–Malmros micromethod is described for the determination of fish blood glucose. A more efficient separation of blood proteins is obtained by precipitating 0.1 ml blood in 10.0 ml tungstic acid. This is followed by hot alkaline reduction of ferricyanide, and colorimetric measurement of a Prussian blue – sodium lauryl sulphate suspension. The method, which eliminates certain difficulties found in other procedures, has been successfully applied in more than a thousand analyses of blood from two species of fish (Opsanus and Ictalurus) having glucose concentrations between 15 and 250 mg per cent.

scholarly journals Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3405 ◽  
Author(s):  
Lili Yang ◽  
Artem Marikutsa ◽  
Marina Rumyantseva ◽  
Elizaveta Konstantinova ◽  
Nikolay Khmelevsky ◽  
...  
Keyword(s):  
Particle Size ◽  
Nitrogen Oxides ◽  
Tungsten Oxide ◽  
High Sensitivity ◽  
Tungstic Acid ◽  
Drift Spectroscopy ◽  
Reaction Conditions ◽  
Sensing Applications ◽  
Sensor Signals

Tungsten oxide is a renowned material for resistive type gas sensors with high sensitivity to nitrogen oxides. Most studies have been focused on sensing applications of WO3 for the detection of NO2 and a sensing mechanism has been established. However, less is known about NO sensing routes. There is disagreement on whether NO is detected as an oxidizing or reducing gas, due to the ambivalent redox behavior of nitric oxide. In this work, nanocrystalline WO3 with different particle size was synthesized by aqueous deposition of tungstic acid and heat treatment. A high sensitivity to NO2 and NO and low cross-sensitivities to interfering gases were established by DC-resistance measurements of WO3 sensors. Both nitrogen oxides were detected as the oxidizing gases. Sensor signals increased with the decrease of WO3 particle size and had similar dependence on temperature and humidity. By means of in situ infrared (DRIFT) spectroscopy similar interaction routes of NO2 and NO with the surface of tungsten oxide were unveiled. Analysis of the effect of reaction conditions on sensor signals and infrared spectra led to the conclusion that the interaction of WO3 surface with NO was independent of gas-phase oxidation to NO2.

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