106-34-3O=C1C=CC(=O)C=C1.Oc1ccc(O)cc1BDJXVNRFAQSMAA-UHFFFAOYSA-NQuinhydrone is an addition compound. It contains a 1,4-benzoquinone and a hydroquinone.
106-34-3DTXSID9059337CHEBI:26491Sicherheitsangaben dienen nur zur Orientierung und ersetzen weder das Sicherheitsdatenblatt (SDB) des Lieferanten noch geltende Vorschriften oder eine fachliche Bewertung.
Danger
H301 (100%): Toxic if swallowed [Danger Acute toxicity, oral]
P261, P264, P264+P265, P270, P271, P273, P280, P301+P316, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P362+P364, P391, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 48 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Chemical: 2,5-Cyclohexadiene-1, 4-dione, compound with 1,4-benzenediol (1:1)
Quinhydrone: Does not have an individual approval but may be used under an appropriate group standard
0.68 [mg/m3]
7.4 [mg/m3]
45 [mg/m3]
VerwendenIn pH determinations (quinhydrone electrode).
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DefinitionThe so-called quinhydrone electrode, containing equivalent amounts of p-benzoquinone and hydroquinone, is used to determine hydrogen ion concentrations of unknown solutions. Hydroquinone is used principally as a photographic developing agent. The main advantages of the quinhydrone electrode are low internal resistance, rapid response, high accuracy, simplicity, free of errors due to the presence of nonreducing gases, and free of salt errors. Major limitations are that it contaminates the solution, cannot be used to monitor a flowing solution, the solution must be free of strong oxidizing and reducing agents, and it is limited to a pH range of 1 to 9. In alkaline solution, the weakly acidic H2Q is neutralized and is subject to oxidation by air and dissolved oxygen. The main application of the quinhydrone electrode is in nonaqueous solvents where reproducible results are obtained in a variety of solvents. The tetra-chloro derivative (chloranil electrode) is even more useful.