SU1437350A1 - Method of determining phosphorus in compounds - Google Patents

Abstract

This invention relates to analytical chemistry and can be used in the determination of phosphorus in minerals, industrial products, ore :: and waters. The purpose of the invention is to increase accuracy and speed. analysis. When determining phosphorus by decomposing the material being analyzed with nitric acid when heated, isolating the phosphorus compounds with ammonium molybdate, then separating the heteroacid, dissolving it in an excess of alkali and titrating the excess with the last acid solution, the goal is to dissolve with a 3-8% solution of nitric acid , and in the process of separating heteroprily acids, polyacrylamide is additionally added, taken in a mass ratio with ammonium molybdate 1: (30-100). The method allows to increase the accuracy of the analysis by 3-5 times and speed up its implementation by 1.5-4.0 I times. 1 table. F O)

Description

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The invention relates to the industry of analytical chemicals and can be used in the determination of phosphorus and mineral raw materials, industrial products, ores and waters.

The purpose of the invention is to improve the accuracy and acceleration of the analysis.

Example 1, Fine Pup)

| hinge 1.0 g of ore raw materials are placed

Ibstack 250 ml capacity, poured

120 ml of 5% nitric acid, boil for 2 minutes, raspor decomposition reexample 7. To dissolve

| under t in a volumetric flask of 250 ml through a glass funnel; ayut; 5 sample weighed 100 ml 1DO tags with distilled water and 10% nitric acid are used. Next, stir.

After 5–10 minutes, 20 ml of the dewatered solution are taken and poured into a conical flask with a capacity of 250 ml, l, filled with water up to 450 mp, 15 MP of 60% ammonium nitrate, acidified with 5% nitrogen are added.

sob is similar to example 1.

Example 8. To precipitate phosphorus heteropolyacids from a decomposition solution, 50 ml of molybdenum acid and 4 ml of 0.2% polyacrylamide are used (polyacryl-m1- / yes to molybdate ratio 1: 125). Further, as in example 1.

acid, 30 ml of molybdenum liquid

25

15.0 ml of 1% polyacrylamide (the ratio of polyacrylamide to molybdenum; am1 No. pi 1:60). i Arrange the contents of the flask in

for 5-10 min and then the suspension

| filtered. Then, similarly, 30 acrylamide is supplied to molybdate 1:28), Next

known method. The results of the on-method are carried out as in Example 1.

Example 9. To precipitate phosphorus heteropolyacids from a decomposition solution, they use 50 mp of molybdenum fluids and 35 ml of 1% polyacrylamide solution (ratio

Limits of PjOj with a standard sample of phosphate flour (22.7%) are given in the table (at).

Example 2. The method is carried out as described in Example 1. 100 ml of 3% nitric acid is used to dissolve a sample of an cubic sample, and 15 mp of a 60% ammonium nitrate solution and 30 ml of molybdenum liquid are used to precipitate complex phosphorus heteropolyacids. g of ammonium molybdate in 1 liter of distilled water) and 10 ml of 1% -1 SOUTH polyacrylamide (relative to polyacrylamide to molybdenum 1:30).

Example 3. The method is carried out as in Example 1. 100 ml of 8% nitric acid is used to dissolve the sample sample.

Example 4. The process is similar to Example 1. For precipitating hetero-. polyacids use 30 ml of molybdenum liquid and 15 ml of 0.2% polyacrylamide (ratio of polyacryl35

40

45

50

55

Example 10. The known method, the definition of this method allows to increase the accuracy of the analysis by 3-5 times and speed up its performance by 1.5-4.0 times.

Claims (1)

Invention Formula The method of determining phosphorus in compounds by decomposing the material to be analyzed is nitric acid when heated, isolating the phosphorus compound by ammonium molybdate, subsequent separation of the phosphorus heteropoly acid, dissolving it in an excess of alkali and titrating it with an excess of an acid solution, about Ji and h. so that, in order to increase the accuracy and speed up the analysis, decomposition is carried out with 3-8% E1 solution of nitric acid, and in the process of extraction of heteropoly acids, polyacrylamide, taken in mass ratio with moth, is additionally introduced ammonium ammonium 1: (30-100). amide (the ratio molyacrylamide to molybdenum 1: 100). , Example 5. The method is carried out as described in Example 1. 30 ml of molybdenum liquid and 10 ml of 1% polyacry / hamide are used to precipitate phosphorus heteropoly acids (polyacrylamide to molybdenum ratio 1:30). Example b. 100 ml of 1.5% nitric acid is used to dissolve the sample sample. The process was carried out as in Example 1. Example 7. For dissolving sample weighed 100 ml of 10% nitric acid were used. Further sample weighed 100 ml of 10% nitric acid were used. Further sob is similar to example 1. Example 8. To precipitate phosphorus heteropolyacids from a decomposition solution, 50 ml of molybdic acid and 4 ml of 0.2% polyacrylamide (polyacryl-m1 / yes to molybdate ratio 1: 125) are used. Further, as in example 1. Example 9. To precipitate phosphorus heteropolyacids from a decomposition solution, 50 mp of molybdenum liquid and 35 ml of 1% polyacrylamide solution are used (polyether ratio Example 10. The known method. The definition of this method allows to increase the accuracy of the analysis by 3-5 times and speed it up by 1.5-4.0 times. Invention Formula The method of determining phosphorus in compounds by decomposing the analyzed material with nitric acid when heated, isolating the phosphorus compounds with ammonium molybdate, then separating the heteropoly acid of phosphorus, dissolving it in an excess of alkali, and titrating the excess with the last acid solution, o By the fact that, in order to increase the accuracy and speed up the analysis, decomposition is carried out with a 3-8% E1 solution of nitric acid, and during the extraction of heteropolyacids, polyacrylamide is additionally introduced, taken in a mass ratio with ammonium olibdatom 1: (30-100).