Of ammonium molybdate

Phosphorus. The presence of phosphorus may be indicated by a smell of phosphine during the sodium fusion. Treat 1 ml. of the fusion solution with 3 ml. of eoneentrated nitric acid and boil for one minute. Cool and add an equal volume of ammonium molybdate reagent. Warm the mixture to 40-50°, and allow to stand. If phosphorus is present, a yellow erystalline precipitate of ammonium phosphomolybdate wUl separate. 

Sonnenschein s reagent (alkaloid detection) a nitric acid solution of ammonium molybdate is treated with phosphoric acid. The precipitate so produced is washed and boiled with aqua regia... 

Discussion. When a solution of an orthophosphate is treated with a large excess of ammonium molybdate solution in the presence of nitric acid at a temperature of 20-45 °C, a precipitate is obtained, which after washing is converted into ammonium molybdophosphate with the composition (NH4)3[P04,12Mo03]. This may be titrated with standard sodium hydroxide solution using phenolph-thalein as indicator, but the end point is rather poor due to the liberation of ammonia. If, however, the ammonium molybdate is replaced by a reagent containing sodium molybdate and quinoline, then quinoline molybdophosphate is precipitated which can be isolated and titrated with standard sodium hydroxide ... 

Determination of phosphate as ammonium molybdophosphate. This may be readily effected by precipitation with excess of ammonium molybdate in warm nitric acid solution arsenic, vanadium, titanium, zirconium, silica and excessive amounts of ammonium salts interfere. The yellow precipitate obtained may be weighed as either ammonium molybdophosphate, (NH4)3[PMo12O40], after drying at 200-400 °C, or as P205,24Mo03, after heating at 800-825 °C for about 30 minutes. 

Aluminum phthalocyanine (PcAlX) can be prepared from the phthalonitrile and aluminum trichloride either in refluxing quinoline138 13g or without a solvent under addition of ammonium molybdate(VI).137 The chloro compound can be transformed to a hydroxy derivative by treatment with sulfuric acid.58-140 Also, the insertion of aluminum in a metal-free phthalocyanine is possible, for example trialkylaluminum can be used.141,142... 

Cyclization of 3,4,5,6-tetrachlorophthalic anhydride (8) in the presence of urea, Ihe appropriate metal salt and catalytic amounts of ammonium molybdate(VI) in nitrobenzene at high temperature leads to phthalocyanine 9. 

Little is reported about this substitution pattern. The 1,3,8,10,15,17,22,24-octasubstituted (1,3-octasubstituted) phthalocyanines are formed as structural isomers (see pp 736,737). 3,5-Dinitro-phthalonitrile (14) on heating at 180-190°C in nitrobenzene with a catalytic amount of ammonium molybdate(VI) affords phthalocyanine 15. 

Similarly, copper(II) 1,8,15,22-tetraazaphthaIocyanine can be made from copper(II) chloride, pyridine-2,3-dicarboxylic acid, and urea in the presence of a catalytic amount of ammonium molybdate(VI), heated to 210DC for 4-5 hours, in a yield of 52%.459... 

Abbott, O.J. 1977. The toxicity of ammonium molybdate to marine invertebrates. Mar. Pollut. Bull. 8 204-205. 

Kincaid, R.L. 1980. Toxicity of ammonium molybdate added to drinking water of calves. Jour. Dairy Sci. 63 608-610. 

Ammonium molybdate solution. Dissolve 6 g of ammonium molybdate in distilled water in a 250-mL Erlenmeyer flask, dilute to 100 mL with distilled water, and swirl to make homogeneous. Prepare just prior to the run. 

Triclofos Sodium Dissolve 25 mg in 10 ml of DW, add 4 ml of 1 M H2S04, 1 ml of a 10% w/v soln. of ammonium molybdate and 2 ml of a methylaminophenol-sulphite soln. and allow to stand for 15 minutes. Add sufficient DW to produce 25 ml, allow to stand for a further 15 minutes and measure the absorbance of a 4 cm layer of the resulting soln. at 730 nm. Calculate the content of Phosphate from a calibration curve prepared by treating suitable vols. of a 0.00143% w/v soln. of KH2P04 in the same manner. NMT 1.0% calculated as po43-. 

Huber s reagent analy chem Aqueous solution of ammonium molybdate and potassium ferrocyanide used as a reagent to detect free mineral acid. hyu-barz re,a- 3nt ... 

Vanadium molybdate reagent - Note wear PPE to prevent injury from concentrated nitric acid. Separately dissolve 20 g of ammonium molybdate and 1 g of ammonium vanadate in water, transfer to a 250-ml beaker and swirl to mix. Slowly add 140 ml nitric acid (approximately 70% m/m HNO3), carefully transfer to a 1-1 volumetric flask, make up to the mark with water and mix. 

Ammonium molybdate solution - add 15 g of ammonium molybdate ((NH4)gMo7024.4H20) to about 900 ml warm water and stir to dissolve. Make up to 1 I in a volumetric flask and filter before use. 

Dissolve 1.8 g of ammonium molybdate in 700 ml of Dl water. Cautiously, while swirling, slowly add 22.3 ml of sulphuric acid. Add 0.05 g antimony potassium tartrate and dilute to 1 I with Dl water. Mix thoroughly and add 2 g of sodium dodecyl sulphate. Store in a dark bottle. Prepare fresh weekly. 

Elemental composition H 4.11%, Mo 48.94%, N 14.29% O 32.65. (NH4)2Mo04 is digested with nitric acid and the molybdenum metal is analyzed by atomic absorption or emission spectrophotometry. It is dissociated to ammonia, which may be measured by titration or by an ion-specific electrode technique (see Ammonia). Ammonium molybdate reacts under acid conditions with dilute orthophosphate solution to form molybdophosphoric acid which, in the presence of vanadium, forms yellow vanadomolybdophosphoric acid the intensity of the yeUow color may be measured by a spectrophotometer at 400 to 490 nm and is proportional to the trace amount of ammonium molybdate. 

A brown-black suspension of M0O2 in hydrate form may be obtained by reducing a solution of ammonium molybdate with hydrogen in the presence of colloidal palladium. 

Purified molybdenum (VI) oxide also is made by prolonged heating of ammonium molybdate in air ... 

An alternative method involves repeatedly evaporating a mixture of ammonium molybdate and nitric acid. Ammonium nitrate so formed is separated from the product molybdenum(VI) oxide by extraction with water ... 

When the powdered coal is mixed intimately with a catalyst such as 1% (of the dry coal) of ferrous sulfate or 0.2% of ammonium molybdate, the oil yield is increased, and its asphaltene content is reduced. 

To prepare molybdenum liquid for determining the phosphate ion, dissolve 50 g of ammonium sulphate in 450 ml of a 68% nitric acid solution and 150 g of ammonium molybdate in 400 ml of distilled water. Cool the second solution to room temperature and pour it into the first one with constant stirring. Bring the total volume of the solution up to one litre. In a few days, filter off the solution for the precipitate. 

Preparation of Molybdenum(VI) Oxide, a. Preparation of Molybdenum(VI) Oxide by the Thermal Decomposition of Ammonium Molybdate. Put a boat with 0.5 g of ammonium molybdate into a porcelain tube in an electric furnace. Connect one end of the... 

Several gas detector tubes are used in conjunction with common colorimetric reactions to detect butadiene. The reactions include the reduction of chromate or dichromate to chromous ion and the reduction of ammonium molybdate and palladium sulfate to molybdemun blue (Saltzman Harman, 1989). 

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