Diethylammonium diethyldithiocarbamate

The following procedure has been recommended by the Analytical Methods Committee of the Society for Analytical Chemistry for the determination of small amounts of arsenic in organic matter.20 Organic matter is destroyed by wet oxidation, and the arsenic, after extraction with diethylammonium diethyldithiocarbamate in chloroform, is converted into the arsenomolybdate complex the latter is reduced by means of hydrazinium sulphate to a molybdenum blue complex and determined spectrophotometrically at 840 nm and referred to a calibration graph in the usual manner. 

Procedure (tin in canned foods). The procedure provides for the removal of interfering copper by the addition of diethylammonium diethyldithiocarbamate in chloroform reagent. ... 

If copper is known to be absent or present only in negligible proportions, dilute the solution with water to 50 mL in a graduated flask, and continue as detailed below. Otherwise, transfer the solution to a small separatory funnel and add 5 mL of the diethylammonium diethyldithiocarbamate in chloroform reagent (diluted 1 20 with chloroform when required). Shake and run off the chloroform layer, extract the aqueous layer with successive 1 mL portions of the reagent until the chloroform layer is colourless finally, wash the aqueous layer with a few mL of chloroform. Dilute the aqueous solution with water to 50 mL in a graduated flask. 

Statham [448] has optimised a procedure based on chelation with ammonium dithiocarbamate and diethylammonium diethyldithiocarbamate for the preconcentration and separation of dissolved manganese from seawater prior to determination by graphite furnace atomic absorption spectrometry. Freon TF was chosen as solvent because it appears to be much less toxic than other commonly used chlorinated solvents, it is virtually odourless, has a very low solubility in seawater, gives a rapid and complete phase separation, and is readily purified. The concentrations of analyte in the back-extracts are determined by graphite furnace atomic absorption spectrometry. This procedure concentrates the trace metals in the seawater by a factor of 67.3. 

Note PAN = 1-(2-pyridylazo)-2-naphthol DMG = dimethylglyoxime DPC = 1,5-diphenylcarbazide DADTC = diethylammonium diethyldithiocarbamate PMBP = 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 HDEHP = b/s-[2-ethylhexyl]phosphate TBP = tributyl phosphate. 

For many samples, pre-concentration is essential, and this is commonly achieved by solvent extraction. Often the nickel tetramethylenedithiocarbamate complex is extracted at pH 2-4 into 4-methylpentan-2-one.1 This system has been applied to soil and sediment extracts39 and to water samples.40-42 Kinrade and Van Loon43 used a mixture of ammonium tetramethylenedithiocarbamate and diethylammonium diethyldithiocarbamate to extract a range of elements, including nickel, into 4-methylpentan-2-one from water samples adjusted to pH 5. New solvent extraction-based procedures are still being published regularly for environmental samples such as plant tissues and water samples.44... 

APDC/DDDC (diethylammonium diethyldithiocarbamate) into chloroform and back-extraction into 7.5N HN03. As this method is a great improvement compared with other methods the experimental procedure is now described in detail. 

Diethylammonium diethyldithiocarbamate (formula 4.41), which dissolves in CHCI3 and is stable in acid solution, is a more convenient reagent than Na-DDTC. In this case the reagent is not added to the aqueous medium, but the analysed solution is shaken with a dilute (e.g., 0.05%) solution of the reagent in CHCI3. The acidity of the solutions being analysed may be higher than in the case of Na-DDTC [101,102]. 

Sometimes diethylammonium diethyldithiocarbamate (formula 4.41), which is soluble in chloroform and stable in acid, is used instead of Na-DDTC [19]. A CCI4 or CHCI3 solution of the reagent is shaken with the sample solution to extract copper(ll). 

Pretreatment dried and sieved (< 1 mm) complexation diethylammonium diethyldithiocarbamate two systems (i) Isco ... 

Complexing reagent 0.02% diethylammonium diethyldithiocarbamate (DDC), prepared in 0.05 M ammonia solution adjusted to pH 9 with acetic acid. Ultratrace amounts of lead in the reagent may be removed by on-line purification of the reagent immediately before meiging with the sample using a 500 p column packed with Cig sorbent. 

Some of the most successful and widely used chelating reagents include dimethylglyoxime for the gravimetric determination of nickel 1,10-phe-nanthroline and its derivatives for the colorimetric determination of iron and copper dithizone for the separation and colorimetric determination of a number of metals but particularly lead, silver, zinc, cadmium, and mercury the dithiocarbamates such as diethylammonium diethyldithiocarbamate and ammonium pyrrolidinedithiocarbamate, used for colorimetry but more widely applied now as selective extractants and the most successful titrant, EDTA. 

P. F. Wyatt "Diethylammonium Diethyldithiocarbamate for the Separation and Determination of Small Amounts of Metals. II. The Isolation and Determination of Arsenic, Antimony, and Tin in Organic Compounds" Analyst 80, 368-79 (1955). 

C9H21CIN2O2, Bis(dimethyl)-pentamethine-cyanine chloride, 41B, 36 C9H22N2S2, Diethylammonium diethyldithiocarbamate, 44B, 28 C9H2 Ag,I13N2, N,N,N,N, N ,N -Hexamethylisopropylenediamine diiodide - silver iodide, 42B, 20... 

The molybdenum-blue method may be extended for determination of amounts of arsenic down to 0 5 / g (as As) if the reagents are specially purified by extraction with diethylammonium diethyldithiocarbamate solution before use. 

Diethylamino)trimethylsilane, D-00336 Diethylammonium chloride, in D-00314 Diethylammonium diethyldithiocarbamate, in... 

Ethylrhodamine B, in R-00002 Thiazine blue Chloride, in T-00136 Diethylammonium diethyldithiocarbamate, in D-00344... 

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