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Indicator which undergoes a definite color change at a specific electrode potential
A redox indicator (also called an oxidation-reduction indicator) is an indicator which undergoes a definite color change at a specific electrode potential
Redox_indicator
Chemical added to show pH of a solution
indicators is preferred, whereas the third compound class, the redox indicators, are used in redox titrations (titrations involving one or more redox
PH_indicator
Blue dye also used as a medication
described here above in the paragraph on redox indicator. Methylene blue is a dye behaving as a redox indicator that is commonly used in the food industry
Methylene_blue
Alkane formed when phytol, a constituent of chlorophyll, loses its hydroxyl group
constituents in petroleum and have been used as proxies for depositional redox conditions, as well as for correlating oil and its source rock (i.e. elucidating
Phytane
Type of titration based on redox reactions
A redox titration is a type of titration based on a redox reaction between the analyte and titrant. It may involve the use of a redox indicator and/or
Redox_titration
Topics referred to by the same term
humidity is exceeded. pH indicator, a chemical detector for protons in acid-base titrations. Redox indicator, a chemical detector for redox titrations. Zeta potential
Indicator
Chemical compound
called Wurster's Red. The hydrochloride salt of TMPD has been used as a redox indicator in the oxidase test and is also used in electron transport chain analysis
Tetramethylphenylenediamine
Redox indicator
chloride (with the formula 2,3,5-triphenyl-2H-tetrazolium chloride) is a redox indicator commonly used in biochemical experiments especially to indicate cellular
Tetrazolium_chloride
Color-changing redox chemical reaction
reaction also works with other reducing agents besides glucose and other redox indicator dyes besides methylene blue. The mechanism of the blue bottle experiment
Blue_bottle_experiment
Chemical compound
as redox indicators that are particularly useful in alkaline redox titrations. The diphenylaminesulfonic acid is a simple prototype redox indicator, owing
Diphenylamine
Chemical detector for metal ions in complexometric titrations
is a redox system whose equilibrium is influenced by the removal of the metal ions, a redox indicator can function as a complexometric indicator. Flaschka
Complexometric_indicator
Laboratory method for determining the concentration of an analyte
Redox titrations are based on a reduction-oxidation reaction between an oxidizing agent and a reducing agent. A potentiometer or a redox indicator is
Titration
Complex of Fe2+ by ortho-phenanthroline
fast and reversible transfer of only one electron, makes it a useful redox indicator in aqueous solution: [Fe(phen)3]2+ → [Fe(phen)3]3+ + 1 e− (Eh
Ferroin
Blue dye derived from indigo
0. Indigo carmine is also a redox indicator, turning yellow upon reduction. Another use is as a dissolved ozone indicator through the conversion to isatin-5-sulfonic
Indigo_carmine
Chemical compound
preparations often contain a blend of both types. Safranin is also used as redox indicator in analytical chemistry. Safranines are the azonium compounds of symmetrical
Safranin
Chemical compound
6-Dichlorophenolindophenol (DCPIP, DCIP or DPIP) is a chemical compound used as a redox dye. When oxidized, DCPIP is blue with a maximal absorption at 600 nm; when
Dichlorophenolindophenol
Heterocyclic organic compound
1,10-Phenanthroline (phen) is a heterocyclic organic compound. It is a white solid that is soluble in organic solvents. The 1,10 refers to the location
1,10-Phenanthroline
1982 Soviet space probe which successfully landed on Venus
spectrometer – MKh-6411 Penetrometer / Soil ohmmeter – PrOP-V Chemical Redox indicator – Kontrast 2 color telephotometer cameras – TFZL-077 Gas chromatograph
Venera_14
Topics referred to by the same term
circuits Test-time compute, in machine learning Tetrazolium chloride, a redox indicator commonly used in biochemical experiments Threshold of Toxicological
TTC
Particular ratio of chemical reactants
phenolphthalein, changes color depending on the pH. Redox indicators are also frequently used. A drop of indicator solution is added to the titration at the start;
Equivalence_point
Soviet space probe that landed on Venus in 1982
spectrometer – MKh-6411 penetrometer / regolith ohmmeter – PrOP-V chemical redox indicator – Kontrast 2 color telephotometer cameras – TFZL-077 gas chromatograph
Venera_13
Chemical compound
Chlorophenol red is an indicator dye that changes color from yellow to violet in the pH range 5.4 to 6.8. The pH of a substance is determined by taking
Chlorophenol_red
Sugars that contain free OH group at the anomeric carbon atom
in Fehling's solution in the presence of methylene blue, a common redox indicator. However, it is inaccurate, expensive, and sensitive to impurities
Reducing_sugar
Chemical compound
Ceric sulfate is used in analytical chemistry for redox titration, often together with a redox indicator. A related compound is ceric ammonium sulfate. The
Cerium(IV)_sulfate
Method to detect presence of polysaccharides
comparative Raman spectroscopy. Starch is often used in chemistry as an indicator for redox titrations where triiodide is present. Starch forms a very dark blue-black
Iodine–starch_test
Chemical compound
reduction produces a red formazan dye that can be used for quantitative redox assays. It is also toxic to prokaryotes. INT is an artificial electron acceptor
INT_(chemical)
Chemical compound
phenoxazine dye that is weakly fluorescent, nontoxic, cell-permeable, and redox‐sensitive. Resazurin has a blue to purple color above pH 6.5 and an orange
Resazurin
Chemical compound
Acid–Base Indicators. CRC Press. pp. 295–297. ISBN 9780849382185. Yoe, John H.; Boyd, George R. (1939). "Patent blue V as a pH and redox indicator". Ind.
Patent_Blue_V
Chemical compound
indicator to detect phenolic compounds. Upon reaction with phenol itself, 2,6-dichlorophenolindophenol is formed, a chemical that is used as a redox indicator
2,6-Dichloroquinone-4-chloroimide
2,6-Dichloroquinone-4-chloroimide
A solid dispersion redox flow battery is a type of redox flow battery using dispersed solid active materials as the energy storage media. The solid suspensions
Solid dispersion redox flow battery
Solid_dispersion_redox_flow_battery
Organic compound
They are used in the manufacture of antioxidants. Xylenol orange is a redox indicator built on a xylenol skeleton. 2,6-Xylenol is a monomer for poly(p-phenylene
Xylenol
Discoloration of urine after consuming beetroot
pigments are absorbed in the colon. Betalains are oxidation-sensitive redox indicators that are decolorized by hydrochloric acid, ferric ions, and colonic
Beeturia
Redox-active bipyridinium derivative
because the redox process induces little structural change. The redox is reversible. These reagents are relatively inexpensive among redox-active organic
Viologen
Chemical compound
and air, turning pink in the process. Diphenylcarbazide is used as a redox indicator and for the photometric determination of certain heavy metal ions,
Diphenylcarbazide
Microbiological and biochemical method for identification
TMPD (or N,N-dimethyl-p-phenylenediamine, DMPD, which is another redox indicator). The reagent is a dark-blue to maroon color when oxidized, and colorless
Oxidase_test
Dye with two chemical forms
becoming pink and blue in alkaline environment. Other example are many redox indicators, which undergo reversible color change between colored and colorless
Leuco_dye
Chemical compound and histologic stain C12H10N3S
electron transfer in microbial fuel cells. Thionine is a pH-dependent redox indicator with E0 = 0.06 at pH 7.0. Its reduced form, leuco-thionine, is colorless
Thionine
Measure of the tendency of a substance to gain or lose electrons
Redox potential (also known as oxidation / reduction potential, ORP, pe, E r e d {\displaystyle E_{red}} , or E h {\displaystyle E_{h}} ) is a measure
Reduction_potential
Type of green fluorescent protein
(March 2004). "Investigating mitochondrial redox potential with redox-sensitive green fluorescent protein indicators". The Journal of Biological Chemistry
RoGFP
Measuring electric potential of a solution as titrant is added
technique similar to direct titration of a redox reaction. It is a useful means of characterizing an acid. No indicator is used; instead, the electric potential
Potentiometric_titration
Chemical element with atomic number 24 (Cr)
October 2008). "Determination of iron using potassium dichromate: Redox indicators". The Department of Chemistry UWI, Jamaica. Archived from the original
Chromium
used for the photometric determination of Fe(II). It is used as a redox indicator with standard potential +1.06 V. The reduced ferrous form has a deep
Transition metal complexes of 1,10-phenanthroline
Transition_metal_complexes_of_1,10-phenanthroline
Biomedical scientist and academic
of redox signaling on cellular responses. Her research on the redox proteome and associated pathways has contributed to drug discovery and redox biomarker
Danyelle_Townsend
charged backbone phosphate groups. On the biosensor, toluidine blue is a redox indicator to measure the oxidation peak current of toluidine blue and indicated
MicroRNA_biosensors
Relative europium concentration in a mineral is either enriched or depleted
Eu anomalies compared to surrounding seawater. This anomaly is an indicator of redox conditions in hydrothermal systems. Serpentinization—the alteration
Europium_anomaly
Types of bacteria found in feces
that the indicating component is redox active, as opposed to the more usual chromogenic format, allowing fecal indicator bacteria such as E. coli and E
Fecal_coliform
Electric current generated by a redox reaction at an electrode
reduction or oxidation of some chemical substance at an electrode (i.e. by the redox reaction between a substance and an electrode). The net faradaic current
Faradaic_current
cerimetry is determined in one titration. Iodometry Redox titration Nonstoichiometry Redox indicator Oxidizing agent Reducing agent Gschneidner K.A., ed
Cerimetry
Measure of the amount of oxygen that can be consumed by reactions in a solution
found in the water sample, potassium dichromate is reduced (since in all redox reactions, one reagent is oxidized and the other is reduced), forming Cr3+
Chemical_oxygen_demand
Thai idol (born 1996)
bottle experiment: E∘half-cell analysis of autoxidation catalysed by redox indicators". Royal Society Open Science. 4 (11) 170708. UK: Royal Society. Bibcode:2017RSOS
Cherprang_Areekul
Milk-based medium used to distinguish between different species of bacteria
bacteria. The litmus in the medium acts as both a pH indicator and a redox (oxidation-reduction) indicator. The test itself tells whether the bacterium can
Litmus_milk
Martian rock noted for its potential life signs
waterfall, has drawn significant attention due to its potential as an indicator of ancient life on Mars. The rover's instruments detected organic compounds
Cheyava_Falls
Catalyst surface active in redox reactions
(ECSA) is the portion of a catalyst's surface that actively partakes in redox reactions.The surface area of a catalyst exposed to the electrolyte, known
Electrochemical_surface_area
Chemical compound
experiments potassium ferricyanide provides a means increasing a solution's redox potential (E°' ~ 436 mV at pH 7). As such, it can oxidize reduced cytochrome
Potassium_ferricyanide
Chemical analysis used to determine quantities of substances
precipitation or a complex forming reaction as well as a titration based in a redox reaction. However, each method in quantitative analysis has a general specification
Quantitative analysis (chemistry)
Quantitative_analysis_(chemistry)
Measurement of the electrolytic conductivity to measure reaction progress
cannot be used with normal indicators. Acid-base titrations and redox titrations are often performed in which common indicators are used to locate the end
Conductometry
Quantitative analysis of a water-soluble oxidizing agent
as iodometric titration, is a method of volumetric chemical analysis, a redox titration where the appearance or disappearance of elementary iodine indicates
Iodometry
Device for measuring a physical quantity
substance potential of a redox reaction is usually determined electrochemically current-free using reversible cells. Redox electrode Other values may
List_of_measuring_instruments
Chemical compound used as an herbicide
Michaelis (1875–1949) named paraquat "methyl viologen" and used it as an indicator in redox reactions. See: Michaelis, L. (1932). "Ein Reduktions-Indikator im
Paraquat
Photocatalyst activity indicator ink (paii) is a substance used to identify the presence of an underlying heterogeneous photocatalyst and to measure its
Photocatalyst activity indicator ink
Photocatalyst_activity_indicator_ink
Biological process to convert light into chemical energy
convert carbon dioxide into carbohydrates. Carbon fixation is an endothermic redox reaction. In general outline, photosynthesis is the opposite of cellular
Photosynthesis
Paleoproterozoic surge in atmospheric oxygen
weathering. Detrital grains composed of pyrite, siderite, and uraninite (redox-sensitive detrital minerals) are found in sediments older than ca. 2.4 Ga
Great_Oxidation_Event
Chemical compound
reduction potential or redox potential. The redox potential is an innate and measurable voltage in the salt which is the prime indicator of the corrosion potential
FLiBe
Condition when water is both anoxic and sulfidic
of reducing sulfate to hydrogen sulfide (H2S). The bacteria utilize the redox potential of sulfate as an oxidant and organic matter as a reductant to
Euxinia
Molecule with ability to reversibly switch states
are potential switches. When the optical properties of the redox state differ, then redox is sometimes called electrochromism. For instance, Ferrocene
Molecular_switch
Measure of peroxide content of a fat or oil
taken up by the excess of acetic acid present. To measure the iodine, a redox titration is performed using sodium thiosulfate. 2 S2O2−3 + I2 → S4O2−6
Peroxide_value
Analytical methods in chemistry
the concentration is known, the number of electrons transferred in the redox reaction. Typical forms of coulometry include bulk electrolysis, also known
Electroanalytical_methods
Vitamin, dietary supplement, and yellow food dye
homocysteine levels increase, elevating the risk of cardiovascular diseases. Redox reactions are processes that involve the transfer of electrons. The flavin
Riboflavin
Oxygen needed to remove organics from water
reduction-oxidation (redox) chemistry of oxygen in the presence of dissimilar metal electrodes was introduced during the 1950s. This redox electrode utilized
Biochemical_oxygen_demand
Test for white blood cells in urine
demonstrated. Leukocyte esterase was found to hydrolyze TAPTA, releasing a redox-active fragment that provided a numerical measure of leukocyte esterase
Leukocyte_esterase
Chemical compound
at inactivating Escherichia coli, a microorganism commonly used as an indicator for fecal contamination and as a surrogate for pathogens in drinking water
Silver_nitrate
Mass extinction event c. 444 million years ago
mercury anomalies and the discordance between deposition of bentonites and redox changes in drillcores from South China straddling the Ordovician–Silurian
Late Ordovician mass extinction
Late_Ordovician_mass_extinction
Process of releasing energy from nutrients using inorganic electron acceptors
overall reaction occurs in a series of biochemical steps, some of which are redox reactions. Although cellular respiration is technically a combustion reaction
Cellular_respiration
Chemical compound
chlorides, like all copper compounds, emit green-blue light. In humidity indicator cards (HICs), cobalt-free brown to azure (copper(II) chloride base) HICs
Copper(II)_chloride
sensor Ozone monitor Pellistor pH glass electrode Potentiometric sensor Redox electrode Smoke detector Zinc oxide nanorod sensor Current sensor Daly detector
List_of_sensors
Polyatomic ion (NO3, charge –1) found in explosives and fertilisers
microorganisms (bacteria and archaea) to respirate. The redox couple NO3−/N2 is at the top of the redox scale for the anaerobic respiration, just below the
Nitrate
Cleavage of C=C, C≡C, or N=N bonds with ozone
consumption of the alkene. Alternatively, various other reagents can be used as indicators of this endpoint by detecting the presence of ozone. If ozonolysis is
Ozonolysis
Any species of fungus that digests moist wood, causing it to rot
products of decomposition from fungal action have variable pH, solubility and redox potentials. Over time this residue becomes incorporated in the soil and
Wood-decay_fungus
Earth's most severe extinction event
B.; Wang, L. N.; Chen, Y. L.; Lai, X. L. (1 June 2015). "High amplitude redox changes in the late Early Triassic of South China and the Smithian–Spathian
Permian–Triassic extinction event
Permian–Triassic_extinction_event
Any organic compound having a sulfanyl group (–SH)
Sulfur-specific analyzers for gas chromatographs are useful. Spectroscopic indicators are the D2O-exchangeable SH signal in the 1H NMR spectrum (33S is NMR-active
Thiol
Type of iron oxide
iron that may be described as follows: Fe → Fe2+ + 2 e− The following redox reaction also occurs in the presence of water and is crucial to the formation
Rust
Iron is a metal with strong redox activity. It exists mainly in the natural environment in two forms: divalent iron (Fe(II)) and trivalent iron (Fe(III))
Dissimilatory iron reducing bacteria
Dissimilatory_iron_reducing_bacteria
Free-radical aging theory
suggests "sedentary behaviour associated with age triggers an oxidized redox shift and impaired mitochondrial function". This mitochondrial impairment
Free-radical_theory_of_aging
Trace fossil
zone. The maker of the traces has been able to tolerate highly variable redox conditions. For example, Chondrites is abundant almost to the exclusion
Chondrites_(genus)
Agents that emit light after excitation by light
staining of certain structures, as a substrate of enzymes, or as a probe or indicator (when its fluorescence is affected by environmental aspects such as polarity
Fluorophore
Cascade of intracellular and molecular events for transmission/amplification of signals
in a process called redox signaling. Examples include superoxide, hydrogen peroxide, carbon monoxide, and hydrogen sulfide. Redox signaling also includes
Signal_transduction
American manufacturer
windows for the Boeing 787 Dreamliner. These windows use viologens and a redox agent to adjust the amount of light that is allowed through the window,
Gentex_(automotive_supplier)
Chemical element with atomic number 33 (As)
1080/00139307509437429. PMID 236901. Cherry, J. A. (1979). "Arsenic species as an indicator of redox conditions in groundwater". Contemporary Hydrogeology – the George
Arsenic
Type of rechargeable battery
(such as NaFeO 2 with the Fe 3 + / Fe 4 + {\displaystyle {\ce {Fe3+/Fe4+}}} redox pair) work well in Na + {\displaystyle {\ce {Na+}}} batteries. This is because
Sodium-ion_battery
Chemical element with atomic number 29 (Cu)
Zischka, Hans (1 September 2024). "Deadly excess copper". Redox Biology. 75 103256. doi:10.1016/j.redox.2024.103256. ISSN 2213-2317. PMC 11269798. PMID 38959622
Copper
Chemical compound
hair coloring and textiles. Indophenol is used in hair dyes, lubricants, redox materials, liquid crystal displays, fuel cells and chemical-mechanical polishing
Indophenol
Chemical compound
the electron transport chain. These two systems are different in their redox potentials for one-electron oxidation. The Em for P700 is approximately
Chlorophyll_a
Species of carnivorous plant
other degradative enzymes, it may be that the presence of oxygen-activating redox cofactors function as extracellular pre-digestive oxidants to render membrane-bound
Venus_flytrap
Earth, a natural material
November 2025. Mattila, Tuomas J. (30 September 2023). "Redox potential as a soil health indicator: how does it compare to microbial activity and soil structure
Soil
subsurface net primary productivity. Huang & Shen (2026) interpret the redox condition of the Earth surface during the Proterozoic as influenced by the
2026_in_paleontology
Chemical compound
by hypochlorous acid and haemolysis by preformed lipid chlorohydrins". Redox Report: Communications in Free Radical Research. 3 (5–6): 263–71. doi:10
Hypochlorous_acid
Human-caused changes to climate on Earth
certain chemical reactions necessary to produce goods from raw materials." "Redox, extraction of iron and transition metals". Hot air (oxygen) reacts with
Climate_change
Milligrams of a base needed to neutralize 1 gram of a given acid
hydroxide (KOH) of known concentration using phenolphthalein as a colour indicator. The acid number for an oil sample is indicative of the age of the oil
Acid_value
Morphological property of soil
color in soil results from chemical and biological weathering, especially redox reactions. As the primary minerals in soil parent material weather, the
Soil_color
Organelle in eukaryotic cells responsible for respiration
three types of functions: Those that perform the electron transport chain redox reactions ATP synthase, which generates ATP in the matrix Specific transport
Mitochondria
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