Quantitative Estimation of Aromatic Nitro Compounds

Wolthuis, Enno; Kolk, Stephen.; Schaap, Luke

doi:10.1021/ac60091a050

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…Potential of platinum cathode with respect to S.C.E. C. Potential between the two platinum electrodes Although these authors did not postulate any mechanism through which these pretreated electrodes would become sensitive to acidity changes, it seemed reasonable to assume that the preanodized electrode was a platinumplatinum oxide electrode (7,12), and that the precathodized electrode was a type of hydrogen electrode. (The actual electrode processes are considerably more complex.)…”

Section: Resultsmentioning

confidence: 99%

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Determination of Organic Nitro Compounds by Controlled-Potential Coulometry

Kruce¹

1959

Anal. Chem.

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sodium carbonate solution varying between 0.006414 and 0.02566 mmole were analyzed with an average deviation of 7 parts per thousand. The molarity of the sodium carbonate solution, prepared by weight, was 0.03207 and the average value from these determinations was 0.03198.Similarly, titrations of sodium acetate were carried out in G-H solvent (2) (50% ethylene glycol and 50% isopropyl alcohol) containing 0.5M sodium perchlorate. The average error was 0.8%.In all titrations it is important to run a preliminar)sample, about the same size as the samples to be titrated, to plot the titration curve and determine the pH of the end point and thus the pH to which the titration medium must be preset.The cation exchange membranes appeared very stable in methanol but in G-H solvent they began to discolor after several days.An analogous attempt to titrate acids using anion exchange membranes (ARX-44 from Ionics, Inc.) was not successful. This was due to the presence of tertiary amine groups in what was supposedly a quaternary ammonium-type exchange resin. The tertiary amine groups were protonated by the acid and therefore results were always low. However, if a strong anion exchange resin membrane is used, there should be no difficulty in carrying out acid titrations by this technique.The success of these acid-base titrations using ion exchange membranes as an ion barrier between the half cells indicates that these membranes should be very adaptable to other coulometric procedures. In contrast to the use of sintered disks and salt bridges for separating half cells the problems of hydrostatic flow and nonpermselectivity are eliminated. Furthermore, the low electrical resistance of these membranes (about 70 ohms) should simplify maintaining constant current during a titration with less sophisticated current supplies.

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Section: Resultsmentioning

confidence: 99%

“…Among the methods which have been used are quantitative reduction (1,2,10), diazotization after reduction (6,12), polarographv either in aqueous (3,9,11) or nonaqueous solvents (10), and various colorimetric methods.…”

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confidence: 99%

Determination of Organic Nitro Compounds by Controlled-Potential Coulometry

Kruce¹

1959

Anal. Chem.

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“…Titrant. Approximately 1 mol L"1 NaN02 solution was prepared by dissolving 70 g of 97% AR NaN02 in distilled water and then diluting to 1 L. Standardization was by volumetric diazotization of pure sulfanilic acid which had been previously dried at 120 °C for 3 h (5). Standardization against USP sulfanilamide dried at 105 °C for 3 h has also been utilized.…”

Section: Methodsmentioning

confidence: 99%

Determination of sulfonyl chlorides by reaction with 3-chloroaniline

Allan¹,

Sobodacha²

1982

Anal. Chem.

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to chemically distinguish KCN and PCC using the Conway microdiffusion cell technique (9) where the sample is treated with sulfuric acid to release HCN gas which is then trapped with NaOH in the central cell of the chamber. In these laboratories it was observed that PCC did not liberate HCN under these conditions which is consistent with the report of Soine (3) that PCC is stable under strongly acidic conditions.LITERATURE CITED

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Polarographic determination of an aromatic nitro compound in the presence of an aromatic amine compound

Ferrari¹

1964

Microchemical Journal

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Quantitative Estimation of Aromatic Nitro Compounds

Cited by 8 publications

References 9 publications

Determination of Organic Nitro Compounds by Controlled-Potential Coulometry

Determination of Organic Nitro Compounds by Controlled-Potential Coulometry

Determination of sulfonyl chlorides by reaction with 3-chloroaniline

Polarographic determination of an aromatic nitro compound in the presence of an aromatic amine compound

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