The Use of Chromotropic Acid for the Quantitative Determination of 2,4-Dichlorophenoxyacetic Acid

LeTourneau, Duane; Krog, N.

doi:10.1104/pp.27.4.822

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…The extinction coefficients determined by LeTourneau and Krog (1952), together with the evidence of formaldehyde production presented in this paper, indicates that the basis for the color produced by 2,4-D and chromotropic acid is the same as that first described for formaldehyde and chromotropic acid by Eegriwe (1937).…”

Section: Discussionsupporting

confidence: 78%

Chromotropic acid method for determining 2,4-D residues in rinses

Erickson¹,

Brannaman²

1954

Hilg

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Section: Discussionsupporting

confidence: 78%

Chromotropic acid method for determining 2,4-D residues in rinses

Erickson¹,

Brannaman²

1954

Hilg

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“…Methanol is cheaper and easily available and may therefore be sold accidentally instead of ethanol or intentionally added to beverages to strengthen the effects of alcohol for more profit. But, ingested methanol is potentially toxic after a much smaller dose than ethanol and in spite of hemodialysis may causes serious neurological symptoms and death [23–26].…”

Section: Discussionmentioning

confidence: 99%

“…False positive results may be due to existence of different compounds that may interact with chromotropic acid including formic acid, formaldehyde, and 2–4 dichlorophenoxyacetic acid (2,4-D) and its derivatives. 2,4-D is a cheap and effective herbicide which may be unusually used to dry grapes [26, 27]. Possibly, reducing the sensitivity of the designed kit can reduce the number of false positive results.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of methanol content of illegal beverages using GC and an easier modified Chromotropic acid method; a cross sectional study

Zamani

Rafizadeh

Hassanian‐Moghaddam

et al. 2019

Subst Abuse Treat Prev Policy

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BackgroundMethanol is highly toxic to human beings and naturally exists in some beverages. Having access to an easy and cheap method for its determination is of great importance to increase the safety of use of these beverages. Our main aim is to evaluate methanol concentration of some alcoholic beverages in Iran black market and compare it with the European and US standards. Also, we evaluated the efficacy of a newly designed and produced chemical kit in determining the risk of methanol toxicity by drinking of such samples compared to gas chromatography method.MethodsMethanol content of suspected alcoholic beverages referred to forensic toxicology laboratory, Guilan province, Iran was measured using gas chromatography and a recently designed kit based on modified colorimetric chromotropic acid method.ResultsOf 1221 samples, 145 (11.9%) had no ethanol content, while in three samples (0.25%), methanol was high enough (700,000; 870,000; 920,000 mg/L) to cause severe methanol toxicity. Median [IQR] ethanol content of the suspected samples was 9% [3.7, 32.75]. Methanol was detected in 128 (10.48%) samples using gas chromatography method and 160 samples (13.1%) with designed kit with 100% sensitivity, 97.07% specificity, and 100% negative-predictive-value.ConclusionsAlcoholic beverages produced in local black market in Iran are not safe at all. The application of the new method is practical, rapid, easy, and accurate to evaluate the risk of methanol toxicity in suspected alcoholic drinks.

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“…5−7 The values of C.R. were computed in mpy (mils penetration per year) from the equation, 61 = C. R. (mpy) KW Atd (22) where K is a constant, W is the ML in g, A is the area of the specimen in cm 2 , t is the time in hour, and d is the density of mild steel (7.86 g/cm 3 ). The values of %IE and θ of the studied where C.R.…”

Section: = − ×mentioning

confidence: 99%

“…Organic dyes, in particular, have found substantial awareness because of their multipurpose applications in diverse fields, including cosmetics, textile, food, pharmaceuticals, and so forth. − They are also employed in the corrosion inhibition of metals and alloys because of their distinctive chemical structures, which contain heteroatoms such as oxygen, nitrogen, and sulfur, in addition to unsaturated bonds and aromatic rings. , This strongly supports the adsorption of these molecules on the solid surfaces, forming protective layers and hence making them superior corrosion inhibitors to protect metallic surfaces. Among the organic dyes used as corrosion inhibitors are chromotropic acid (4,5-dihydroxynaphthalene-2,7-disulfonic acid) and chromotrope 2R (4,5-dihydroxy-3-(phenyldiazenyl) naphthalene-2,7-disulfonic acid), and their molecular structures are illustrated in Figure .…”

Section: Introductionmentioning

confidence: 99%

Inhibition Evaluation of Chromotrope Dyes for the Corrosion of Mild Steel in an Acidic Environment: Thermodynamic and Kinetic Aspects

Fawzy

Toghan

2021

ACS Omega

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In this report, two chromotrope dyes, chromotropic acid (CA) and chromotrope 2R (CR), were explored as inhibitors against mild steel corrosion in 1.0 M sulfuric acid solutions at 303 K. Electrochemical, spectroscopic, chemical, and microscopic techniques, namely, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy, mass loss, and scanning electron microscopy (SEM), have been employed to evaluate the inhibition efficiencies (%IEs) of the examined organic dyes. The %IEs were found to increase with the inhibitors’ concentrations, while they decreased with rising temperature. The outcomes of the PDP technique displayed that the examined inhibitors operated as mixed-type inhibitors with anodic prevalence. The impedance spectra described by Nyquist and Bode graphs in the corrosive environment and in the presence of various concentrations of the examined inhibitors showed single depressed capacitive loops and one-time constants. This behavior signified that the mild steel corrosion was managed by the charge transfer process. The SEM micrographs of the surfaces of mild steel samples after adding the examined inhibitors revealed a wide coverage of these compounds on the steel surfaces. Thus, the acquired high %IEs of the examined inhibitors were interpreted by strong adsorption of the organic molecules on the mild steel surface. This constructed a shielding layer separating the alloy surface from the corrosive medium, and such adsorption was found to follow the Langmuir isotherm. Furthermore, the evaluated thermodynamic and kinetic parameters supported that the nature of such adsorption was mainly physical. Results obtained from all employed techniques were consistent with each other and revealed that the %IE of the CR inhibitor was slightly higher than that of CA under similar circumstances. Finally, the mechanisms of both corrosion of mild steel in sulfuric acid solutions and its inhibition by the tested organic dyes were also discussed.

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The Use of Chromotropic Acid for the Quantitative Determination of 2,4-Dichlorophenoxyacetic Acid

Cited by 13 publications

References 11 publications

Chromotropic acid method for determining 2,4-D residues in rinses

Chromotropic acid method for determining 2,4-D residues in rinses

Evaluation of methanol content of illegal beverages using GC and an easier modified Chromotropic acid method; a cross sectional study

Inhibition Evaluation of Chromotrope Dyes for the Corrosion of Mild Steel in an Acidic Environment: Thermodynamic and Kinetic Aspects

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