Addition Of H2S Research Articles

Effect of H2S poisoning on the i.-r.-spectrum of CO and COS adsorbed on alumina-supported platinum

An i.-r. investigation has been conducted to determine the effect of H2S poisoning on CO- and COS-covered γ-alumina-supported platinum surfaces. The chemisorption of CO on a “clean” surface resulted in the formation of a sharp band at 2080 cm–1. Adsorption of H2S on a CO-covered surface drastically decreased the intensity of the 2080 cm–1 band, and produced a weak band at 2170 cm–1. Adsorption of CO on an H2S-poisoned platinum surface showed bands at 2170, 2080, and 2060 cm–1. The 2170 cm–1 band disappears with evacuation; it is attributed to CO weakly adsorbed on sulphur-poisoned sites. COS adsorption on platinum resulted in the formation of bands at 2080, 2050, 1995, 1950 and 1920 cm–1. The 2080 cm–1 band is due to the decomposition of COS on platinum at room temperature. The three bands at 2050, 1995 and 1950 cm–1 disappeared with evacuation and are presumably due to the weakly chemisorbed COS on “clean” or sulphur-poisoned platinum sites. The chemisorption of CO on a COS-covered surface results in the decrease of intensity of the 1920 cm–1 band. Addition of H2S to a COS-covered surface caused a more rapid disappearance of the 1920 cm–1 band than the 2080 cm–1 band. The formation of the 1920 cm–1 band is attributed to the CO stretching of the chemisorbed COS molecule on a “clean” platinum site.

Studies on the nutrition of the Rice Plants with Reference to Helminthosporium Leaf Spots : XII. Absorption and Translocation of Nutrients as Influenced by Hydrogen Sulphide and their relationships with the growth of the plant

(1) Absorption of P2O5 was remarkably inhibited just at the same degree as K2O. by the addition of H2S to nutrient solution when H2S was given at the first time to the plant which had been grown without H2S, whereas it was little inhibited or rather promoted after continuous addition of H2S (Fig. 1). (2) Translocation of some nutrients such as CaO and SiO2 was assumed to be retarded in part by the decreased transpiration dud to H2S. (3) From the result of a water culture experiment in which H2S was added during the period from the stage of vigorous tillering stage to that of young-ear formation, it was found that the addition of H2S gave the most unfavorable effect on the yield (weight of ears per plant) and on the resistance to the disease with the plant grown in complete nutrient solution, because of the inhibition in the absorption of many nutrients, whereas it gave less effect with the plant grown in the solutions lacking in N, K2O, SiO2 and MnO, because absorption-inhibition of lacking nutrients could not take place here (Fig. 2). Accordingly the decrease of yield and resistance to the disease caused by H2S seems to be mainly attributable to the absorption-inhibition of some nutrients such as N, K2O, SiO2 and MnO at least in this experiment.

Studies on the Nutrition of the Rice Plant with Special Reference to Nitrogen and Silica : IV. On silica in the exudation and guttation sap

Silica concentration in exudation sap ranged from 400 ppm to 800 ppm and that in guttation sap from 100 ppm to 300 ppm and silica concentration in guttation sap increased with the concentration of silica in culture solution to a certain level (Fig. 1). And silica concentration in exudation and guttation sap was higher in the plant grown with stable manure which contains much silica than in the plant grown with mineral fertilizer or green manure. Both addition of H2S to the solution and heavy application of ammonium sulphate to the soil induced root injury and led to retardation in exudation and guttation, and also to decrease in the amount of silica in these saps (Fig. 2). From these results it is suggested that silica concentration in the exudation and guttation saps has a close relationship with the concentration of available silica in culture media or soil solution. It is also suggested that both the ability for exudation and guttation, and the amount of silica in these saps can be utilized as measures to diagnose the root activity.

Studies on the Nutrition of Rice Plant with Reference to Hellminthosporium Leaf Spot (Preliminary report) : IX. Absorption of Nutrients by Root and Metabolism of Nitrogen and Carbohydrate in Plant as Affected by Hydrogen Sulphide.

To elucidate the influence of H2S on nutrient absorption and metabolism of nitrogen and carbohydrate, a solution culture experiment was carried out. Just after the addition of H2S to the solution, absorption of K2O and SiO2 was inhibited at first accompanied with such disturbances in carbohydrate metabolism as an increase in reducing and non-reducing sugar contents, and a decrease in starch content. But afterward when the inhibition of nutrients absorption and carbohydrate metabolism became extreme, nitrogen metabolism was also disturbed, resulting in the increase in soluble-N content and decrease in protein-N content.