Ethylene diamine detection

Of samples swollen with ethylene diamine, the graft yield at a 50 1 liquor ratio increases as the concentration of ethylene diamine increases. This is due to the increase of decrystallization of swollen samples, which helps the penetration velocity of the chemicals through the cellulosic chains. Graftability of the samples treated with 100% ethylene diamine is lower that of the sample treated with 75%. This is due to the dissolution of low DP chains and some of the hemicelluloses, which is detectable by the increase in DP of the sample teated with 100% ethylene diamine. 

Gagnon [203] has described a rapid and sensitive AAS method developed from the work of Crisp et al. [200] for the determination of anionic detergents at the ppb level in natural waters. The method is based on determination by atomic absorption spectrometry using the bis(ethylene-diamine) copper (II) ion. The method is suitable for detergent concentrations up to 50 ig/l but it can be extended up to 15 mg/1. The limit of detection is 0.31 ig/1. 

Reduction of dibenzothiophene with sodium in liquid ammonia has been shown to be sensitive to the experimental methods employed however, the major product is usually 1,4-dihydrodibenzothiophene. 27 -28i The electrochemical reduction of dibenzothiophene in ethylene-diamine-lithium chloride solution has been shown to proceed via stepwise reduction of the aromatic nucleus followed by sulfur elimination. In contrast to the reduction of dibenzothiophene with sodium in liquid ammonia, lithium in ethylenediamine, or calcium hexamine in ether, electrolytic reduction produced no detectable thiophenol intermediates. Reduction of dibenzothiophene with calcium hexamine furnished o-cyclohexylthiophenol as the major product (77%). Polaro-graphic reduction of dibenzothiophene 5,5-dioxide has shown a four-electron transfer to occur corresponding to reduction of the sulfone group and a further site. ... 

TNT vapor in air was determined by a colorimetric method involving a Na sulfite-hydroxide color complex (Ref 15). A method is presented for the quant spectrophotometric analysis of polynitroaromatics as their Meisenheimer complexes in ethylene diamine dimethylsulfoxide solns (Ref 32). Detection by formation of colored reaction complexes determined by wavelength absorbances and absoiptivities of the reagent/expl samples are described (Refs 92 132). A semi-quant colorimetric determination... 

It is advisable to determine the presence of white compound in the products of nitration of toluene. It is also advised 65 to use the TIC technique on silica-gel the solution of nitro compounds in acetone is put on the staitiitg line and Ihe chromatogram is developed with vapours of benzcne-acctonc -meth-anol dioxane (50 5 30 15 vol.%.)- The chromatogram is treated with ethylene diamine solution in acetone (50/50). White compound can be detected as a magenta coloured spot of Hr = 0.6S. (Nitro derivatives give a reddish-brown coloured spot at Hf= 0.80). 

The small amount of H20 detected during the MTA scan of ethylene-diamine tetraacctic acid (Fig. 7) is typical for adsorbed, residual mois-... 

The reaction of resorcarenes II with suitable diamines and CH2O under high dilution conditions leads to l,2 3,4-bis-bridged tetrabenzoxazines , or in the case of ethylene diamine to a head-to-head connected bis-resorcarene . K 2-aminoalcohols are used in the Mannich reaction with resorcarenes, either benzoxazines, oxazine or oxazolidine rings can be formed. In the case of aminoethanol, predominantly the benzoxazine 78 (R = CH2CH2OH) was detected in solution, while oxazolidines were predominantly obtained with 2-alkylaminoethanols . 

Ac-MBOCA = N-acetyl-4,4 -methylenebis-(2-chloroaniline) ECD = electron capture detection ED = electrochemical detection EDTA = ethylene diamine tetraacetic acid El = electron impact FID = flame ionization detection GC = gas chromatography ... 

Post-column derivatlzation of reducing sugars with ethylene-diamine in a weakly alkaline medium at 150°C generates compounds detectable down to 1 pmol by electrochemical oxidation. This procedure was recommended over an earlier reaction involving 2-... 

Mopper, K. Dawson, R. Liebezeit, G. Hansen, H.P. Borate complex ion exchange chromatography with fluorimetric detection for determination of saccharide ethylene-diamine. Anal. Chem. 1980, 52, 2018. 

Note Testing of different anticoagulant showed that less ion suppression was detected if potassium (k2) ethylene diamine tetra-acetic acid (EDTA)... 

Reactions between the sulfur-containing amino acids cysteine and methionine (Fig. 2.18) and rufhenium(II) arene anticancer complexes are of much interest in view of the strong influence of sulfur amino acids on the intracellular chemistry of platinum drugs, their involvement in detoxification and resistance mechanisms [100]. We found [101] that [(ri -biphenyl)Ru(en)Cl][PF 5] reacts slowly with the thiol amino add L-cysteine in aqueous solution at 310 K, pH 2-5, and only to about 50% completion at a 1 2 mM ratio. Reactions appeared to involve aquation as the first step followed by initial formation of 1 1 adducts via substitution of water by S-bound or O-bound cysteine. Two dinuclear complexes were also detected as products from the reaction. In these reactions half or all of the chelated ethylene-diamine had been displaced and one or two bridging cysteines were present The unusual cluster species (biphenyl) Ru g was also formed espedaUy at higher cysteine concentrations. The reaction was suppressed in 50 mM triethylammo-nium acetate solution at pH > 5 or in 100 mM NaCl suggesting that thiols may not readily inactivate Ru(II)-en arene complexes in blood plasma or in cells. Similarly, reactions with the thioether sulfur of methionine appeared to be relatively weak. Only 27% of [(r -biphenyl)Ru(en)Cl][PF5] reacted with L-methionine (L-MetH) at an initial pH of 5.7 after 48 h at 310 K, and gave rise to only one adduct [(ri -biphenyl) Ru(en) (i-MetH -S)]. ... 

Yang et al. reported a capacitive immunosensor for the detection of Salmonella spp. based on grafted ethylene diamine and self-assembled AuNP monolayers on a glassy... 

Yang, G.-J., Huang, J.-L., Meng, W.-J., Shen, M., and Jiao, X.-A. (2009) A reusable capacitive immunosensor for detection of Salmonella spp. based on grafted ethylene diamine and self-assembled gold nanoparticle monolayers. Anal Chim. Acta, 647, 159-166. 

Removal of the Ni(CN)2NH3 host. In a typical experiment [Ni(CN)2NH3]- polymer)x is suspended in 50ml IM aqueous HQ and stirred for 2 days un no CN vibration peak (2161 cm 1) is detected in the Fourier transform infrared (FTIR) spectrum and no Ni by SEM-EDS. The black powder was washed with ethanol and ether and dried in vacuo. Ethylene diamine also can be used to dissolve the Ni(CN)2NH3 matrix if non-aqueous conditions are desired. 

Quite recently Hodgson et al (1963) have reported that sulfur solutions in certain amine solvents contain free radicals (Table XVI) as detected by electron spin resonance. Sulfur in ethylene diamine, piperidine, and tetramethylguanidine forms at least 10 moles of free radicals per mole of octatomic sulfur. 

M = 2900, %E = 40 and ethylene diamine-initiated M = 5500, %E = 40 detection in presence of other nonionics Merck Silica Gel GF-254, impregnated with oxalic acid 90 10 CHClj/MeOH Modified Dragendorff reagent barium chloride/tri iodide solution 38... 

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