A method has been proposed for the determination of hydrogen sulphide and sulphur dioxide in a mixture. The method is based upon the quantitative oxidation of sulphide and sulphite with an excess of radiochloramine-T in alkaline medium /0.1N NaOH/. The released chloride activity is proportional to the total amount of sulphide and sulphite present. Addition of 1% CdSO4 solution to the mixture of sulphide and sulphite precipitates sulphide, and sulphite in the filtrate determined by the reagent. From the difference in activities, the amount of sulphide can be calculated. This method can be employed for the determination of hydrogen sulphide and sulphur dioxide in air samples.
Christou , A. , Manganaris , G.A. , Papadopoulos , I. , Fotopoulos , V.
2013 . Hydrogen sulfide induces systemic tolerance to salinity and non-ionic osmotic stress in strawberry plants through modification of reactive species
Isotope exchange of deuterium and36Cl between N-methylimidazolium chloride and gaseus hydrogen chloride has been studied over the temperature range of 249–322 K. A mechanism of exchange for both atmos is proposed and the equilibrium isotope effect of deuterium accompanying this reaction is discussed.
Authors:Dong-Yong Chung, Eung-Ho Kim, Young-Joon Shin, Jae-Hyung Yoo, Cheong-Song Choi, and Jong-Duk Kim
The decomposition rate of oxalate by hydrogen peroxide has been investigated by a KMnO4 titration method. The rate equation for decomposition of hydrogen peroxide in the aqueous phase is 1n([H2O2]/[H2O2]0)=–k1·t, where k1=0.2, for [H+]<2M, k1=0.2+0.34([H+]–2), for [H+]>2M. As the acidity increases over 2M, an acid catalysis effect appeard. The new rate equation proposed for the decomposition of oxalate by hydrogen peroxide is
The rate constant for decomposition of oxalate, k2, increased with nitric acid concentration and the effect of hydrogen ion concentration was expressed as k2=a[H+]n, where the values fora andn were a=1.54, n=0.3 at [H+]<2M, a=0.31, n=2.5 at [H+]>2M, respectively.
Authors:T. Yoshida, T. Tanabe, N. Sugie, and A. Chen
A technique has been proposed to promote hydrogen production from water by increasing the energy deposition in water through
the conversion of γ-ray to low-energy electrons, which is achieved by putting solid materials into water. Simulation studies
by the MCNP code indicate that the average deposited energy in water can be increased by optimizing geometry of the materials.
In the present experiments using Al2O3 particles of various average diameters, the maximum amount of hydrogen produced is 3.48 μmol/cm3 for the water containing Al2O3 particles of 3 μm diameter, which is more than two order of magnitude larger of the H2 produced in water-only configuration.
An intermediate neutron moderation method for measurement of moisture and/or hydrogen contents of small samples is presented.
The sample is placed on the top face of a neutron howitzer, with a cadmium sheet between. Thermal neutrons resulting from
intermediate neutron moderation in the sample are detected with a3He proportional counter placed on the sample, by a cadmium difference method. With a 500 mCi Am-Be neutron source, the limit
of moisture detection for a 10×20×1.8 cm3 asbestos plate in 1 min count time is 0.5 wt.%. The precision of measuring the hydrogen contents of 250 ml hydrocarbons containing
112 mg H/ml is 0.9% under the same conditions.
In this paper the reduction of lead and zinc sulphide by hydrogen is described. It has been found that the rate of formation
of elemental lead or zinc is favourably affected by mechanical activation of PbS and ZnS produced by intensive grinding. This
effect was observed in the region 678–1048 K for galena and in the region 851–1023 K for sphalerite. It has appeared that
disordering in the structure of both minerals results in the decrease in experimental activation energy.
The compilation comprises the experimental and calculated resonance integrals of nuclides (hydrogen to fermium), for neutron
capture and fission reactions. The thermal cross-sections of the corresponding reactions are also included. Whenever possible,
in addition to original values of the resonance integrals, normalized values are also given. The theoretical explanation and
physical meaning of the resonance integrals determined by different approaches are briefly discussed.
Authors:R. Lindstrom, R. Paul, D. Vincent, and R. Greenberg
By irradiating with cold neutrons and avoiding hydrogenous materials of construction, we have developed a PGAA instrument at the Cold Neutron Research Facility at NIST with hydrogen detection limits in the microgram range in many materials. Quantities of 5–10 g H/g are presently measurable in gram-sized samples of silicon or quartz, and of order 0.01 wt % can be quantitatively measured in complex silicate rocks.
Authors:T. Muroyama, A. Shinohara, T. Saito, A. Yokoyama, K. Takamiya, S. Morimoto, K. Nakanishi, H. Baba, T. Miura, Y. Hamajima, T. Kaneko, H. Muramatsu, S. Kojima, and M. Furukawa
Annihilation γ-rays of π0 and pionic X-rays were measured in the gas mixtures of H2+Z and CH4+Z systems (Z=He, Ne, Ar and Kr). Pion capture probability of hydrogen atom was obtained from the annihilation γ-ray counts
and the capture probability of Z atom was obtained from the pionic X-ray intensities. Transfer rates were determined from
the data based on a combined large mesomolecular model. The transfer rates obtained were smaller than the systematics of the
Russian group. Difference in the transfer rate between the gas and the liquid phases was found by a comparison of the present
results with our previous ones.