| 释义 |
Definition of furan in English: furannoun ˈfjʊəranfyo͝oˈran mass nounChemistry 1A colourless volatile liquid with a planar unsaturated five-membered ring in its molecule. 〔化〕呋喃 Chemical formula: C₄H₄O Example sentencesExamples - Furan, a colourless, volatile liquid used in some chemical manufacturing industries, causes cancer in animals in studies where animals are exposed to furan at high doses.
- Prior to the group's meetings to draft the dioxin and furan standards, participants believed that the main point of contention would be over the numerical limits.
- Furfural reacts with phenols, ketones, and esters as an aldehyde; removal of the aldehyde group yields furan, which is converted to tetrahydrofuran, used in the manufacture of nylon.
- In other words, dioxin and furan production decreases with the increase of chlorine availability.
- Although these derivatives are not properly nitrofurans, the 2-furylethylene compounds with the nitro group located outside the furan ring are isomers of position of the classical 5-nitrofuran derivatives.
- While a furan unit is part of the polychlorinated dibenzofuran structure, these are very different compounds with different effects.
- Sediment dioxin and furan levels from some of these open coast sites have been highly variable since 1993.
- Cycloadditon of one of the double bonds on either the furan or the pyrone ring of a psoralen molecule forms a monoadduct.
- Several studies have demonstrated that only the 5-nitrofurans are mutagenic and that derivatives with the nitro group outside the furan ring do not show mutagenic activity.
- This study, however, stays firmly focussed on the standard for dioxin and furan emissions.
- Many plants make use of furocoumarins, in which a coumarin is bonded to a furan ring, as protective substances.
- 1.1count noun Any substituted derivative of furan.
呋喃衍生物 Example sentencesExamples - An adsorption powder for removing mercury and other metals, dioxins, furans and other organic compounds from metal- and organic compound-comtaminated soil and method therefor.
- According to Marcocchio, and the World Health Organization, dioxins are linked to cancer, birth defects and auto-immune problems, while furans are chemically similar but slightly less toxic.
- Dioxins, and furans, are chemical compounds generated as by-products of most forms of combustion, particularly of plastics and rubber.
- Its chemical composition makes it incapable of producing dioxins or furans when burned.
- This argument was presented in a modified form to the effect that the system of monitoring for dioxins and furans (other objectionable organic pollutants) was unreasonable and contrary to Articles 2 and 8 of the Convention.
- The compounds are furans, thiophenes and pyrroles substituted by two aryl groups and an aliphatic acid group containing from two to six carbon atoms or a derivative thereof.
OriginLate 19th century: from synonymous furfuran. Definition of furan in US English: furannounfyo͝oˈran Chemistry 1A colorless volatile liquid with a planar unsaturated five-membered ring in its molecule. 〔化〕呋喃 Chemical formula: C₄H₄O Example sentencesExamples - In other words, dioxin and furan production decreases with the increase of chlorine availability.
- While a furan unit is part of the polychlorinated dibenzofuran structure, these are very different compounds with different effects.
- Furan, a colourless, volatile liquid used in some chemical manufacturing industries, causes cancer in animals in studies where animals are exposed to furan at high doses.
- Cycloadditon of one of the double bonds on either the furan or the pyrone ring of a psoralen molecule forms a monoadduct.
- Furfural reacts with phenols, ketones, and esters as an aldehyde; removal of the aldehyde group yields furan, which is converted to tetrahydrofuran, used in the manufacture of nylon.
- Sediment dioxin and furan levels from some of these open coast sites have been highly variable since 1993.
- Many plants make use of furocoumarins, in which a coumarin is bonded to a furan ring, as protective substances.
- Although these derivatives are not properly nitrofurans, the 2-furylethylene compounds with the nitro group located outside the furan ring are isomers of position of the classical 5-nitrofuran derivatives.
- This study, however, stays firmly focussed on the standard for dioxin and furan emissions.
- Prior to the group's meetings to draft the dioxin and furan standards, participants believed that the main point of contention would be over the numerical limits.
- Several studies have demonstrated that only the 5-nitrofurans are mutagenic and that derivatives with the nitro group outside the furan ring do not show mutagenic activity.
- 1.1 Any substituted derivative of furan.
呋喃衍生物 Example sentencesExamples - The compounds are furans, thiophenes and pyrroles substituted by two aryl groups and an aliphatic acid group containing from two to six carbon atoms or a derivative thereof.
- An adsorption powder for removing mercury and other metals, dioxins, furans and other organic compounds from metal- and organic compound-comtaminated soil and method therefor.
- Dioxins, and furans, are chemical compounds generated as by-products of most forms of combustion, particularly of plastics and rubber.
- According to Marcocchio, and the World Health Organization, dioxins are linked to cancer, birth defects and auto-immune problems, while furans are chemically similar but slightly less toxic.
- This argument was presented in a modified form to the effect that the system of monitoring for dioxins and furans (other objectionable organic pollutants) was unreasonable and contrary to Articles 2 and 8 of the Convention.
- Its chemical composition makes it incapable of producing dioxins or furans when burned.
OriginLate 19th century: from synonymous furfuran. |