Quantitative determination of small amounts of hydrogen peroxide and of ozone

1930 ◽  
Vol 2 (1) ◽  
pp. 55-56 ◽  
Author(s):  
Nelson. Allen
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination

The development of 1,3-diphenylisobenzofuran as a highly selective probe for the detection and quantitative determination of hydrogen peroxide

2016 ◽  
Vol 51 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Krzysztof Żamojć ◽  
Magdalena Zdrowowicz ◽  
Paweł Błażej Rudnicki-Velasquez ◽  
Karol Krzymiński ◽  
Bartłomiej Zaborowski ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination

A New Portable Colorimetric Sensor Based on RGB Chromaticity for Quantitative Determination of Sarin in Water

2020 ◽  
Vol 16 (4) ◽  
pp. 475-484
Author(s):  
Tingting Huang ◽  
Guohong Liu ◽  
Jingxiang Yu ◽  
Meng Liu ◽  
Zhiping Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination ◽  
Light Source ◽  
Potable Water ◽  
Spectral Response ◽  
Water Sources ◽  
Test Tube ◽  
Colorimetric Sensor ◽  
Digital Data

Background: Sarin is a nerve agent which is lethal to people due to its high toxicity. According to its extreme toxicity, sarin, relatively lack of color, highly toxic, miscible in water, poses viable threats to potable water sources. Therefore, there is an urgent need for portable, rapid and yet reliable methods to monitor for adulteration of potable water sources by sarin on spot. Methods: A stock solution of 30 mg/L sarin was prepared daily by dissolving 300 μg of sarin in 10 mL isopropanol. A certain amount of sarin was added to the glass tube, and then o-dianisidine and hydrogen peroxide were added. The pH value of the solution was adjusted to 9.8. The solution was transferred to the test tube after 10 minutes. A test tube of 2 mL was placed between the light source and the RGB color sensor. The LED light source illuminates directly over the test tube while the RGB sensor obtained the generated spectral response. This RGB voltage output is connected to the ADC and microcontroller to convert these analog voltages to three digital data. This RGB digital data is linked to the microcomputer through the serial port that is interfaced with the user interface. The data thus obtained in the sensor can be processed to display the sarin concentration. Results: Under the optimum conditions as described above, the calibration curve of chromaticity value versus sarin concentration was linear in the range of 0.15 mg/L to 7.8 mg/L. According to the IUPAC definition, theoretical detection limits of this method were 0.147 mg/L and 0.140 mg/L for R and B values, respectively. The practical detection limit was 0.15 mg/L. The sensor was successfully applied to the determination of sarin in artificial water samples and the recoveries were between 86.0% to 95.9%. Conclusion: The results in the present work have demonstrated the feasibility to design a new portable colorimetric sensor based on the RGB chromaticity method for quantitative determination of sarin in water. The influences of chromogenic reagent, oxidant, reaction time, o-dianisidine concentration, hydrogen peroxide concentration, reaction temperature, pH on the chromaticity values were investigated. The results showed that the sensor possessed high selectivity, sensitivity and good repeatability. The method would be potentially applied to the analysis of other toxic compounds in environment, such as other chemical warfare agents.

THE REACTION OF POLYSTYRENES WITH BROMINE

1940 ◽  
Vol 18b (10) ◽  
pp. 309-317 ◽  
Author(s):  
Léo Marion
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination ◽  
Dilute Solutions ◽  
Real Value

The quantitative determination of the absorption by polystyrenes of oxygen from benzoyl hydrogen peroxide yields low results in all cases. The action of bromine on polystyrenes is a function of the concentration. With relatively higher concentrations of bromine the values obtained for added bromine are often negative. With more dilute solutions the added bromine always has a real value although it is never more than half the theoretical value and often less. In this case also the substituted bromine is low. The results obtained with the more dilute solutions of bromine might be interpreted by the assumption that polystyrenes are mixtures of saturated and unsaturated individuals, if conclusions based on a reaction so thoroughly affected by concentration and yielding in some cases negative values for added bromine were not altogether untrustworthy.

A self-referenced optical colorimetric sensor based on silver and gold nanoparticles for quantitative determination of hydrogen peroxide

2017 ◽  
Vol 251 ◽  
pp. 624-631 ◽  
Author(s):  
Pedro J. Rivero ◽  
Elia Ibañez ◽  
Javier Goicoechea ◽  
Aitor Urrutia ◽  
Ignacio R. Matias ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Gold Nanoparticles ◽  
Quantitative Determination ◽  
Colorimetric Sensor ◽  
Silver And Gold Nanoparticles

scholarly journals Tellurium doped zinc imidazole framework (Te@ZIF-8) for quantitative determination of hydrogen peroxide from serum of pancreatic cancer patients

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Batool Fatima ◽  
Dilshad Hussain ◽  
Adeela Saeed ◽  
Muhammad Salman Sajid ◽  
Saadat Majeed ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Hydrogen Peroxide ◽  
Quantitative Determination ◽  
Cancer Patients ◽  
Modified Electrode ◽  
Electrochemical Sensing ◽  
Serum Samples ◽  
Scanning Calorimetry ◽  
X Ray

AbstractThe tellurium doped zinc imidazole framework (Te@ZIF-8) is prepared by a two-step hydrothermal strategy for the electrochemical sensing of hydrogen peroxide. Material is characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The electrochemical characterization of the MOF modified electrode is done by a three-electrode system. Electrochemical sensing of hydrogen peroxide is made by cyclic voltammetry, amperometry, and impedance measurements. Results demonstrate that Te@ZIF-8 shows a detection limit of 60 µM with linearity up to 0.98855. Material is stable to 1000 cycles with no significant change in electrochemical response. Amperometry depicts the recovery of hydrogen peroxide from human serum up to 101%. Impedance curve reveals the surface of Te@ZIF-8-GCE (glassy carbon electrode) as porous and rough and an interface is developed between analyte ions and the sensing material. Finally, the modified electrode is used for the quantitative determination of hydrogen peroxide from serum samples of pancreatic cancer patients, diagnosed with CA 19-9.

Colorimetric Method for the Quantitative Determination of Plasma Catalase Activity

1958 ◽  
Vol 4 (4) ◽  
pp. 316-322 ◽  
Author(s):  
Gerald B Dobkin ◽  
Morton D Glantz
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination ◽  
Prussian Blue ◽  
Catalase Activity ◽  
Colorimetric Method ◽  
Blue Color ◽  
Normal Individuals ◽  
Gum Ghatti

Abstract A colorimetric method for the determination of plasma catalase activity has been presented. The assay is based on the reaction of undecomposed hydrogen peroxide with ferricyanide and ferric gum ghatti to give a Prussian Blue color. The plasma catalase activity of a group of normal individuals has been determined.

Quantitative Determination of Blood Added to Hamburger

1965 ◽  
Vol 48 (6) ◽  
pp. 1122-1126 ◽  
Author(s):  
Lester Hankin
Keyword(s):  
Hydrogen Peroxide ◽  
Quantitative Determination ◽  
Iron Content ◽  
Quantitative Method ◽  
Sodium Tungstate ◽  
Ground Beef ◽  
Tolerance Limits ◽  
Standard Formula

Abstract A quantitative method is proposed for determining blood deceptively added to ground beef (hamburger) to conceal excess fat. Blood is eluted from the sample with water, oxidized with hydrogen peroxide to liberate iron from the hemoglobin, and then treated with sodium tungstate to precipitate proteins. Iron content is then measured. Samples of hamburger to which blood was added were analyzed to provide a standard formula for the calculation of excess blood in unknown samples. The amount of iron in unadulterated or blank samples is taken into account in these calculations. Tolerance limits for the method are given.

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