Colorimetric test, identification

Identifications in terms of gas chromatographic responses, infrared data, and colorimetric tests... 

A more detailed description of tests for LA is given in Vol l,pp A580-R to A587-R of Encycl Tests for Propellants Since std colloidal proplnts are mixts of colloided NC with explosive(such as NG, NGu, DEGDN, etc ) and nonexpl ingredients(such as DPhA, EtCentr, DBuPh, etc), no simple colorimetric tests are known for identification of components without preliminary separation of them. The separation can be done by solvent extractions, fractionation of the extracts or by chromatographic separation... 

PETN or materials used for their manuf, such as DPhA or dim ethyl amine) p 3(Improved Webster s test) pp 3-4(SneIling s colorimetric test for TNT on the skin) p 4(Neal s test for TNT on the skin) p 5(Pinto St Fahy s colorimetric test for TNT in the air) 10)G. Halfter 8c H. Winkler, Die Chemie 57, 124-25(1944)(Colori-metri c detn of TNT) lOa)I.Eisdorfer, PicArsn ChemLabRept 107708(l944)(Identification of HE s) ll)M. Schechter 8c H.L. Haller, IEC, AnalEd 16, 325-26(1944)(Colorimetric detn of... 

The presence of hexosamine in the hydrolyzate of a mucopolysaccharide may well be indicated on the basis of the above colorimetric tests and the amount present estimated. The identity of the amino sugar cannot thereby be established, since the colorimetric methods cannot differentiate between glucosamine, chondrosamine or any other 2-amino sugar. The ideal means for the identification of a hexosamine is the isolation of a well characterized crystalline derivative. Numerous compounds for this purpose or of potential application have been recorded in the literature but only in the case of the Schiff s bases have satisfactory results been obtained. 

For more definite identification of components, digest ca 0.2g of the expl with 3ml of distd w in a 10ml beaker and decant the liq thru a filter to an evaporating dish, Evap to dryness and test for AN(See Charts A B). Digest the insol portion with a three 3ml portion of acetone decanting thru a filter and examine the residue, for Al, under microscope. Evap the filtrate to dryness by warming gently, and test the deposit for TNT by one or more colorimetric tests listed in Charts A B... 

Isocyanate Identification by Colorimetric Test Diisocyanates can be identified by hydrolyzing the polyurethane and examining the breakdown products by infrared or paper chromatographic techniques. For a rapid qualitative check, however, a spot test is available. A small sample of polyurethane is heated in a test tube until white fumes are evolved and these fumes are absorbed on a filter paper. One drop of a solution of 4-nitrobenzene diazofluoroborate in methanol (approx. 1 %) on... 

Analytical and Test Methods. Colorimetric quaUtative tests for diketene are known but seldom used (131). Identification is by spectrometric methods. Diketene has typical ir absorption bands at - ISSO, 1855, and 1685 cm , and signals at 3.92 (t), 4.51 (m), and 4.87 (m) ppm in the H-nmr spectmm (CDCl ). Purity is routinely monitored by gc. Alternatively, diketene is quantitatively converted to acetoacetic derivatives which are assayed by standard methods. 

Part—I has three chapters that exclusively deal with General Aspects of pharmaceutical analysis. Chapter 1 focuses on the pharmaceutical chemicals and their respective purity and management. Critical information with regard to description of the finished product, sampling procedures, bioavailability, identification tests, physical constants and miscellaneous characteristics, such as ash values, loss on drying, clarity and color of solution, specific tests, limit tests of metallic and non-metallic impurities, limits of moisture content, volatile and non-volatile matter and lastly residue on ignition have also been dealt with. Each section provides adequate procedural details supported by ample typical examples from the Official Compendia. Chapter 2 embraces the theory and technique of quantitative analysis with specific emphasis on volumetric analysis, volumetric apparatus, their specifications, standardization and utility. It also includes biomedical analytical chemistry, colorimetric assays, theory and assay of biochemicals, such as urea, bilirubin, cholesterol and enzymatic assays, such as alkaline phosphatase, lactate dehydrogenase, salient features of radioimmunoassay and automated methods of chemical analysis. Chapter 3 provides special emphasis on errors in pharmaceutical analysis and their statistical validation. The first aspect is related to errors in pharmaceutical analysis and embodies classification of errors, accuracy, precision and makes... 

Store it in a CaCl2 desiccator Separation and identification of Low Freezing Compounds and Nitrocompounds of Explosive Oils are briefly described here under Pierson s Procedure D-3 (See above). The tests are colorimetric. Some of these compds may be identified by IR and X-ray spectroscopy (Ref 11, pl363)... 

Transfer the soln to a vol flask, take an aliquot and test it colorimetrically Note If additional identification is desired, det nitrogen content by titanous chloride... 

The instrument used in colorimetry is called colorin eter it determines and specifies colors by referring to other colors. This process will permit,by the proper selection of suitable reagents, the identification of principle ingredients in the sample tested when it is in solution. The depth of color, measured by the colorimeter, gives the quantity of material present in a solution. This is known as colorimetric analysis (See also Color... 

Cd + can be detected by the insolubility of its yeUow sulfide (see Analytical Chemistry of the Transition Elements). Several reaction and spot tests allow the identification of Cd +. Quantitative determinations are based on gravimetric (CdS or /3-naphthylquinoltne complex) or titrimetric (EDTA) methods. Several physical techniques can be used in quantitative and qualitative analysis polarography (or related techniques, even in the presence of Zn, Cu, Bi and Pb), electrodeposition, colorimetric methods, flamephotometric methods, neutron activation, atomic absorption, and ICP spectrometry and ion selective electrodes. 

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