Diethyl-p-phenylenediamine

In the DPD colorimetric method for the free chlorine residual, which is reported as parts per million of CI2, the oxidizing power of free chlorine converts the colorless amine N,N-diethyl-p-phenylenediamine to a colored dye that absorbs strongly over the wavelength range of 440-580 nm. Analysis of a set of calibration standards gave the following results... 

Diethyl aniline, 54 Diethylcarbaniazine citrate, 54 Diethyl carbamyl chloride, 54 Diethyl chlorophosphate, 54 Diethylene triamine, 54 Diethyl ether, 54 Di(2-ethylhexyl) phthalate, 54 Diethyl ketone, 54 Diethyl-p-phenylenediamine, 54 Diethyl phthalate, 54 Diethylstilbestrol, 55 Diethyl sulfate, 55 Diethyl zinc, 55 Difluoromethane chloride, 55 Digitoxin, 55 Diglycidyl ether, 55 Digoxin, 55 Diisobutyl ketone, 55 Diisopropylamine, 55 Diisopropyl ether, 55 DIKAMIN , 2,4-D, 55 DIKONIRT , 2,4-D, 55 Dimefox, 55 Dimethoate, 55 3,3 -Dimethoxybenzidine, 55 n,n-Dimethylacetamide, 56 Dimethylamine, 56 4-Dimethylaminoazobenzene, 56 Dimethylaminoethanol, 56 n,n-Dimethyl aniline, 56 7,12-Dimethylbenz[a]anthracene, 56 3,3 -Dimethylbenzidine, 56... 

Water To 100 mL sample, add 2 mL glycine solution and mix. In a separate flask, place 5 mL buffer reagent and /V,/V-diethyl-p-phenylenediamine indicator solution and mix. Add 200 mg EDTA, disodium salt, and then add glycine-treated sample and mix. UVA/IS spectrometry >0.1 mg/L No data APHA1998 (Method 4500-CL02-D)... 

Spectrophotometry (or colorimetry) has been used to measure chlorine dioxide in water using indicators that change colors when oxidized by chlorine dioxide. Spectrophotometric analyzers determine the concentration of chlorine dioxide by measuring the optical absorbance of the indicator in the sample solution. The absorbance is proportional to the concentration of the chlorine dioxide in water. Indicators used for this technique include jV,jV-diethyl-p-phenylenediamine, chlorophenol red, and methylene blue (APHA 1998 Fletcher and Hemming 1985 Quentel et al. 1994 Sweetin et al. 1996). For example, chlorophenol red selectively reacts with chlorine dioxide at pH 7 with a detection limit of 0.12 mg/L. The interferences from chlorine may be reduced by the addition of oxalic acid, sodium cyclamate, or thioacetamide (Sweetin et al. 1996). 

Phenanthrene was analyzed directly by fluorescence with excitation at 365 nm and emission at 394 nm and quantified by comparison to a standard curve. 5-Chlorouracil was analyzed directly by absorbance at 270 nm. Attempts to determine 5-chlorouracil as the pyrolysis product of its tetramethylammonium salt (11) were unsuccessful. Hypochlorite was determined by the ferrous-N,N-diethyl-p-phenylenediamine titration method (12). 

Influence of Hypochlorite on Parfait Columns. One potential use of the parfait method is the recovery of organic matter from drinking water. To test for the interaction of chlorine disinfectant with column components or eluents, the influence of 2 ppm of hypochlorite was assessed in an unspiked control column. Each eluate was assayed for hypochlorite by using the ferrous N,N-diethyl-p-phenylenediamine titrimetric method (12). No hypochlorite was detected. Each eluate was also analyzed by GC and found to be virtually identical to a blank column without hypochlorite run simultaneously. 

In color photography diethyl-p-phenylenediamine is an important developer because its oxidation product readily couples with a large number of phenol and reactive methylene compounds to form indoplieiiol and indoaniline dyes, which are the basis of most of the current color processes. 

Chlorine residual An oxidized form of /V,/V-diethyl-p-phenylenediamine 515... 

De Whalley and his coworkers have made extensive studies on the application of paper chromatography to raffinose. To separate raffinose from large proportions of sucrose, a 1-butanol-benzene-pyridine-water solvent was used.140 81 To avoid pyridine, a 1-propanol-ethyl acetate-water mixture was recommended.141 As a color reagent, a-naph-thol-phosphoric acid was used. In this manner, less than 1 % of raffinose in cane sugar could be separated and determined. Partial hydrolysis of the raffinose, using invertase directly on the filter paper, proved useful in some instances.93 142 Melibiose was then detected with 3,5-dinitrosali-cylate142 or with diethyl-p-phenylenediamine sulfite.93... 

Indireot sonovoltammetry has enabled the determination of some speoies by their effeot on electrochemically initiated reactions. For instance, Cu(ll) can be determined by inhibiting the eleotrochemical reaction between A/,A/-diethyl-p-phenylenediamine and homocysteine through complexation of the latter [192]. 

N, K -DIETHYL-p-FENYLENDIAMIN NJSI -DIETHYL-p-PHENYLENEDIAMINE DIETHYL-PARAPHENYL-EN EDIAMINE DPD... 

DIETHYL-p-PHENYLENEDIAMINE see DJV200 N,N -DIETHYL-p-PHENYLENEDIAMINE see DJV200 DIETHYL PHENYLTIN ACETATE see DJV800... 

N,N-Diethyl-p-phenylenediamine, liq rapidly turning brown on exposure to light, bp 260-62° (Ref 4)... 

Substituted p-phenylenediamines are developers used in color photography. They include A,A-diethyl-p-phenylenediamine (p-diethylaminoaniline) monohydrochloride, its toluidine analog, A-p-anilinopyrrolidine, 4-amino-A-/S-methanesulfonamidoethyl-m-toluidine sesquisulfate monohydrate and 4-amino-3-methyl-A-ethyl-A-(/9-hydroxy -ethyl)aniline sulfate. 

Test kits based on immobilized Bindschedler s green and N,N-diethyl-p-phenylenediamine were proposed for the rapid determination of active chlorine in water [3]. 

Chlorine may be analyzed photometrically by the quantitatively detectable product of CI2 with N,N-diethyl-p-phenylenediamine (DPD-Method DIN EN ISO 7393-2). A comparable procedure based on DPD is suitable for CIO2. Specific methods are requested for the analysis of air (colored product of airborne CI2 in a tube with a special reaction layer Moosbach et al. 1999). 

M. O. Babiker and J. A. W. Dalziel, Studies on the Determination of Sulphide Using n,n-Diethyl-p-Phenylenediamine. Anal. Proc., 20 (1983) 609. 

Dihydro-3//-pyrazol-3-ones are also used as couplers in colour photography. During the chro-mogenic development of the exposed colour film, they react with the developer, e.g. iV,iV-diethyl-p-phenylenediamine, to give a purple dye 6. 

Chlorine in water may be analyzed by several wet chemical methods, which include iodometric, amperometric, and V,V-diethyl-p-phenylenediamine (DPD) methods based on titrations. It may also be analyzed by colorimetric methods using DPD, syringal-dazine, or 4,4, 4"- methylidynetris(fV,fV-dimethylaniline(leucocrystal violet)). 

Diethylaminoaniline 4-(Diethylamino) aniline p-(Diethylamino) aniline. See N,N-Diethyl-p-phenylenediamine... 

N,N-Diethyl-1,4-phenylenediamine Diethyl-p-phenylenediamine p-Phenylenediamine, N,N-diethyl-... 

Diethyl aniline Diethyl oxalate N,N-Diethyl-p-phenylenediamine Diethyl sulfate . Diethyl toluene diamine... 

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