Impregnation with silver nitrate

The Gutzeit Test.3—This test is as accurate as the Marsh test and the apparatus necessary is comparatively simple. It consists in allowing the arsine to react with strips or discs of dry filter paper impregnated with silver nitrate or, in the more recent modifications of the method, mercuric chloride or bromide. 

Silica gel G (impregnated with silver nitrate) CHCI3/AcOH (99.5 0.5) 3... 

De Vries, B. (1963) Quantitative separations of higher fatty acid methyl esters by adsorption chromatography on silica impregnated with silver nitrate. J. Am. Oil Chem. Soc., 40, 184-186. 

Gunstone ct found that separation of saturated and unsaturated fatty acid glycerides by crystallization at -10° is improved by addition of silver nitrate in methanol to complex with the unsaturated components. Morris reports separation of CIS and trans fatty acids and oxygenated fatty acids by thin-layer chromatography on silica gel impregnated with silver nitrate. With untreated silica there was no separation. 

Conversion of ( )-F to ( )-H [=( )-3f)-hydroxyisopimara-8(14), 15-diene] could be executed in the usual manner. The stereoisomers ( )-H and ( )-I were separable by chromatography over silica gel impregnated with silver nitrate. The overall yield of ( )-H was 8.5% (15 steps) based on ( )-C. 

Sterols and their acetates have been separated by column and thin-layer chromatography on silica gel impregnated with silver nitrate.17c... 

Most of the silver catalysts used in chemical industry and research are prepared via conventional techniques using preformed microporous or mesoporous inorganic support materials. Examples are the preparation of 5 wt.% Ag/Si02 by support impregnation with silver nitrate or a titania-based catalyst on which silver was deposited by treatment with AgN03 and Na2C03. ... 

In a synthesis of A -cholestadiene-la,3 -diol (la-hydroxyprovitamin D3), Israeli chemists effected dehydrobromination of the dibromide (1) at 130° (4 hr.) in HMPT containing about 10% of triethylmethylammonium dimethyl phosphate. A 1.3 1 mixture of the A -diene (2) and the A -diene (3) was obtained in almost quantitative yield. The mixture was separated on a silica column impregnated with silver nitrate. 

Silica, and to a lesser extent alumina, are the most common stationary phases used for the separation of low molecular mass organic compounds. Chemically bonded silica sorbents are used for the separation of polar organic compounds in the normal-phase and reversed-phase modes. Wide-pore, chemically bonded sorbents, are used for the separation of biopolymers [18,22]. Some separations require specially prepared stationary phases, such as silica gel impregnated with silver nitrate for the isolation of unsaturated compounds capable of forming charge transfer complexes with silver [23] (section 10.6.1), or silica and chemically bonded phases coated with cellulose tris(3,5-... 

Activated alumina F-10 impregnated with silver nitrate from solution in concentrations above 10% (as silver) is a relatively poor catalyst, exhibiting a break-through time of about two hours in the presence of oil and water vapor (15). Part of the loss in activity is due to oil-vapor poisoning. The effects of a number of factors on the behavior... 

H]Linoleic acid methyl ester and [9,10,12,13- H]oleic acid methyl ester were chromatographed on silica impregnated with silver nitrate attaining partial separation from the appropriate [l- " C]methyl esters. The tritium atom bound on the... 

Source From Separation of prenylquinones, prenylvitamins and prenols on thin-layer plates impregnated with silver nitrate, in J. Chromatogr. ... 

Pyka, A. Analytical evaluation of visualizing reagents used to detect tocopherol and tocopherol acetate on thin layer. J. Liq. Chromatogr. Relat. Technol. 2009, 32, 312-330. Lichtenthaler, H.K. Bomer, K. LUjenberg, C. Separation of prenylquinones, prenylvitamins and pienols on thin-layer plates impregnated with silver nitrate. J. Chromatogr. 1982, 242, 1%-201. 

The principle of reprocessing is as follows ( PUREX process ). The process starts with cutting the fuel rods in pieces of about 5 cm length. The fuel (UO2/PUO2) is dissolved in half-concentrated nitric acid. Radioactive aerosols and radio-iodine set free in the process are retained in filters (aerosols in mechanical filters, iodine in filters impregnated with silver nitrate). Fission rare gases (mainly Kr, Tin = 10.5 years) maybe condensed in cold charcoal filters and filled later into steel cylinders. 

A specific separation can be attained in some cases by impregnation with compounds which form coordination, chelate or inclusion complexes. Thus silica gel layers impregnated with silver nitrate have been used successfully for several years. 

Silica gel G layers which have been impregnated with silver nitrate are air dried like ordinary layers and then activated by heating 30 min at 110° C (see p. 60). They are rapidly deactivated by atmospheric... 

Solvents. Table 71 contains solvent mixtures suitable for fractionating the most important lipid classes. Besides these solvents, the following have also been often used the methyl esters of unsaturated, positionally isomeric fatty acids have been separated from one another by triple development at —15° C using toluene [142] triglycerides have been fractionated with chloroform-carbon tetrachloride-methanol-acetic acid (50 -I- 50 + 1.5 -1- 0.5) [6, 7]. The separation of lecithins on silica gel H, impregnated with silver nitrate [5], is very satisfactory using chloroform-methanol-water (65 -1- 25 + 4) [5] (see also [57, 88]). 

Fig. 143 A. Two-dimensional fractionation of a synthetic mixture of very similar compounds on a layer partially impregnated with silver nitrate [182]. Adsorbents silica gel G and silica gel G-silver nitrate (5%) solvents 1 direction petrol ether (BP 40—60° C)-diethyl ether (90 + 10), 2 direction petrol ether (BP 40—60° C)-diethyl ether (90 + 10), twice developed. 1 trialkyl glycerol ethers 2 dialkyl-glycerides 3 alkyl glycerides 4 triglycerides each with 0—3 double bonds...

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