scholarly journals New Apparatus for Determination of Hydrogen Sulfide in Water—Part I

1914 ◽  
Vol 6 (8) ◽  
pp. 676-677
Author(s):  
Geo. B. Frankforter
Keyword(s):  
Hydrogen Sulfide ◽  
New Apparatus

Fluorescence chemosensors for hydrogen sulfide detection in biological systems

The Analyst ◽  
2015 ◽  
Vol 140 (6) ◽  
pp. 1772-1786 ◽  
Author(s):  
Zhi Guo ◽  
Guiqiu Chen ◽  
Guangming Zeng ◽  
Zhongwu Li ◽  
Anwei Chen ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Biological Systems ◽  
Sulfate Reducing Bacteria ◽  
Fluorescence Sensing ◽  
Sulfate Reducing ◽  
Potential Applications ◽  
Reducing Bacteria

The development of H2S fluorescence-sensing strategies and their potential applications in the determination of sulfate-reducing bacteria activity.

scholarly journals Isotherms of hydrogen, carbon monoxide and their mixtures

1931 ◽  
Vol 134 (824) ◽  
pp. 502-512 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Pressure Range ◽  
Close Agreement ◽  
Gas Mixtures ◽  
Industrial Processes ◽  
Gaseous Mixtures ◽  
Previous Communication ◽  
New Apparatus ◽  
Temperature Ranges

In a previous communication from these laboratories by G. A. Scott an account was given of the determination of the isotherms of hydrogen, carbon monoxide and mixtures of the two in the molecular proportion 2 : 1, 1 : 1 and 1 : 2 over a pressure range up to 170 atmospheres and at a temperature of 25° C. Since the completion of that investigation new apparatus has been installed so that the pressure and temperature ranges might be extended; and in this paper are embodied the results of further determinations carried out at both 0° C. and 25° C. and over a pressure range extending up to 600 atmospheres. In pursuing this investigation further it is our endeavour to furnish information in regard to the gaseous mixtures in question over the pressure and temperature ranges now commonly used in industrial processes. The Isotherms of the Single Gases . A repetition in our new apparatus of the determinations previously made by Scott both for the single gases and gas mixtures at 25° C. and at pressures up to 170 atmospheres showed his figures to be in close agreement with our own, the variations never exceeding 0·1 per cent.

Pararosaniline as a New Chromogen for the Extractive Spectrophotometric Determination of Trace Amounts of Hydrogen Sulfide in Air

1993 ◽  
Vol 76 (4) ◽  
pp. 730-734 ◽  
Author(s):  
B S M Kumar ◽  
N Balasubramanian
Keyword(s):  
Methylene Blue ◽  
Hydrogen Sulfide ◽  
Absorption Coefficient ◽  
Sodium Hydroxide Solution ◽  
Current Method ◽  
Color System ◽  
Isopentyl Alcohol ◽  
Sensitive Spectrophotometric Method ◽  
Disodium Ethylenediaminetetraacetate

Abstract A sensitive spectrophotometric method for the determination of trace amounts of hydrogen sulfide H2S) in air, after fixing in a zinc acetate–disodium ethylenediaminetetraacetate–sodium hydroxide solution, is described. The reaction of iodate with the fixed H2S in the presence of acid and an excess of chloride leads to the formation of ICI2 ions. The resulting IC-2 species forms an ion par with pararosaniline cation, and the product is extracted into isopentyl alcohol. The color system obeys Beer’s law over the range of 0 to 5.0 μg H2S. The molar absorption coefficient of the color system is 1.8 × 104 L mol-1 cm-1 . The coefficient of variation is 3.3% for 10 determinations at 3.0 μg H2S. The effect of interfering gases on the determination is discussed. The method was applied to the determination of residual amounts of H2S present in a laboratory fume cupboard, and results were compared to those obtained by the widely used methylene blue method. The current method can be used to determine residues as low as 0.2 μg H2S.

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.

scholarly journals Determination of Water Content of Nitrogen Containing Hydrogen Sulfide by Karl Fischer Coulometric Titration

2019 ◽  
Vol 35 (7) ◽  
pp. 777-782 ◽  
Author(s):  
Xuting ZHI ◽  
Haifeng WANG ◽  
Baijun LIU ◽  
Xiaoping SONG ◽  
Zhanyuan LI ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Water Content ◽  
Coulometric Titration ◽  
Karl Fischer

A Simplified Method for the Determination of Hydrogen Sulfide in the Work Environment

AIHAJ ◽  
1985 ◽  
Vol 46 (11) ◽  
pp. 693-695 ◽  
Author(s):  
LUC P. VAN DEN BERGE ◽  
ANDRE DEVREESE ◽  
MICHEL VANHOORNE
Keyword(s):  
Hydrogen Sulfide ◽  
Work Environment ◽  
Simplified Method
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