Mercaptoethanol strength

If the injected acid itself contains iron (III), a precipitation of the asphaltic products can occur when it comes in contact with certain crude oils. This leads to practically irreversible damage of the zone treated. The amount of precipitate generally increases with the strength and concentration of the acid. Certain organic sulfur compounds, such as ammonium thioglycolate, mercaptoethanol, cysteamine, thioglycerol, cysteine, and thiolactic acid [581], can reduce the iron (HI). 

Beta maritima, Helianthus annum, Helianthus petio-laris Etiolated and mature leaves uses high ionic strength buffer, high concentration of mercaptoethanol, PEG 6000, and chloroform Isolates both mtDNA and cpDNA yields restrictable DNA from leaves 23... 

The activity of the tartrate-resistant acid phosphatase enzyme is affected by the strength of reducing agents. Whereas mild-reducing agents, such as ascorbate or p-mercaptoethanol, lead to... 

A possible model for the chromophore of non-haem iron proteins has been described which contains 2-mercaptoethanol, but the rate of uptake of oxygen by the model is higher than would be expected on the basis of a simple reduction of Fe " to Fe" by the mercaptoethanol followed by its reoxidation to Fe" . A rather looser model is mercaptoacetato-bis(ethylenediamine)cobalt(iii). The kinetics of the inner-sphere reduction of this and its oxygen analogue by Cr" have been reported. The rate constant (25 °C, ionic strength = OT) for [Co enaCSCHaCOa)] is > 2 X 10 lmol-is-i, and that for [Co en2(OCH2COa)]+ is 9-9 x lOM mol s . ... 

The reaction rates of the oxidations of mercaptoethanol and dithioerythritol were determined at various concentration ratios of the thiols with respect to MB over a range of pH s and ionic strengths in both water and D O by following the decrease in the... 

Table VIII lists the rates of oxidation of mercaptoethanol by methylene blue at various ionic strengths. Note that at any given concentration of MB+ the rate of the reaction decreases with increasing ionic strength. At the higher concentrations of MB ", only the initiation reaction rate constant would be influenced by the change in the ionic strength of the solution.

Effect on Ionic Strength on Mercaptoethanol Oxidation Rates Rate X 10 M sec ... 

Table IX shows the rate laws for the oxidation of mercaptoethanol by MB at pH 10.3 at different ionic strengths.

The effects of pH, ionic strength, reagent concentration ratios and deuterium substitution of the sulfur-bonded hydrogens on both the rates and rate laws for the methylene blue oxidations of mercaptoethanol and dithioerythritol have been determined. A free radical chain mechanism consistent with the observed kinetic behavior of the oxidation reactions is proposed. A key feature of the proposed mechanism is the formation of the sulfur-sulfur linkage of the disulfide in the reversible formation of a disulfide radical anion (RSSR) as a chain propagating step in the chain sequence. 

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