hydrogen sulfide

hydrogen /hy·dro·gen/ (H) (hi´dro-jen) chemical element, at. no. 1; it exists as the mass 1 isotope (protium, light or ordinary h.), mass 2 isotope (deuterium, heavy h.), and mass 3 isotope (tritium) .

---

hydrogen cyanide  an extremely poisonous liquid or gas, HCN, used as a rodenticide and insecticide.

hydrogen peroxide  a strongly disinfectant cleansing and bleaching liquid, H2O2, used in dilute solution in water.

hydrogen sulfide  an ill-smelling, colorless, poisonous gas, H2S.

---

hydrogen sulfide

n.

A colorless, flammable poisonous gas that has a characteristic rotten-egg odor, is formed in the decomposition of organic matter containing sulfur, and is used as an antiseptic, a bleach, and a reagent.

---

hydrogen

a chemical element, atomic number 1, atomic weight 1.00797, symbol H. See Table 6. It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).

---

hydrogen bonding

weak electrostatic attraction between one electronegative atom and the hydrogen atom covalently linked to a second electronegative atom.

hydrogen breath test

detects hydrogen production as a product of bacterial fermentation of carbohydrates, an indicator of inflammatory bowel disease or carbohydrate malabsorption.

hydrogen cyanide

hydrocyanic acid.

heavy hydrogen

hydrogen having double the mass of ordinary hydrogen; deuterium.

hydrogen ion balance

see acid-base balance.

hydrogen ion concentration

the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral. A pH of less than 7 indicates acidity, above 7 indicates alkalinity. See also acid-base balance and ph.

hydrogen peroxide

H₂O₂, used in solution as an antibacterial agent. A 3% solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.

hydrogen peroxide-based teat dips

see teat dip.

hydrogen sulfide

an ill-smelling, colorless, poisonous gas, H₂S; much used as a chemical reagent. Hydrogen sulfide is often present in gases from oil wells and from manure vats under slatted floor barns. Poisoning of cattle causes diarrhea, dehydration, dyspnea and death in convulsions. The feces are black and the breath smells of hydrogen sulfide. Called also hydrosulfuric acid. See also manure pit gas poisoning.

hydrogen swell

defective canned meat can. Can is distended due to production of hydrogen as a result of corrosion of the can surface.

---

sulfide

any binary compound of sulfur; a compound of sulfur with another element or base.

---

hydrogen sulfide

see hydrogen sulfide.