SU1396016A1 - Method of quantitative analysis of phosphorus-contaning complexes in boiler water - Google Patents

Abstract

This invention relates to kalactic chemistry, in particular, to the quantitative determination of phosphorus-containing complexones in boiler water. In order to improve the selectivity of the determination, the sample to be analyzed is pretreated with vanadate (BA) when heated at pH 2.7, followed by measuring the optical density of the solution. Its succession in the presence of salicylichyxroxamic acid at a ratio of its concentration to VA 1: 50-30. Table I.

Description

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The ejacculation relates to analytical chemistry, namely, to photometric methods for determining the Losforso-containing comycoxoids to aqueous media.

An inappropriate invention is the new definition selectivity.

Example.

Ammonium vanadate 1.3-1SG m / l

Salicylgvdroxacic acid 6,5 10-3 m / l

1:50 reagent ratio

Perchloric acid 0,005, m / l „

An aliquot portion of the solution being analyzed, containing 0.02-0.30 mg of nitrilotrimethylLosphosa (NTF) acid, is placed in a heat-resistant glass with a capacity of 00 ml, diluted with 20 ml distilled water; 1 ml of 310 And ammonium vanadate solution and boil for 5-10 min.

After cooling, transfer the solution from one to another in a 50 колsh volumetric flask and add 5 ml of a 1% solution of hydrocylndroxamic acid in glacial acetic acid V to the mark with distilled water, transfer the optical density measurement after 5 min. a purple-colored rastoror on a photoelectrocolorimeter with a green light filter (CW wavelength nm) in a cuvette with an absorbing layer thickness of 50 mm relative to distressed water.

The content of nitric acid and phosphonic acid is determined according to the graduated graph.

In order to build a calibration graph, the preparation is prepared; the content of solutions, 30 mg of nitrile-methylphosphonic acid nitrate in the sampleJ is diluted to 20 W: 1 with distilled water and then proceeds in the same way as with the analyzed water,

Example 2

Ammonium Vanadate 2.2-10, m / l

Salicylhydroxamic acid 6.5

 ten

g

m

/ l

Ratio of reagents 1:30 Sulfuric acid 0, m / l Llikvot part of the analyzed solution containing 0.05-0.50 mg

NITRILTRIMET1ShfOSFONOPO1 acid, software

Placed in a heat-resistant glass with a capacity of 100 MP, diluted to 20 ml with distilled sugar, 1 p1 1; - (GK) T 2 ML

acid solution, 1.7 ml .5

five

0

five

0

five

0

five

0

five

 And paqTBOpa ammonium vanadate and boil for 5-10 minutes.

After cooling, the solution is transferred to a 50 ml volumetric flask, 5 MP of 1% salicylichydroxamic acid solution in glacial acetic acid is added, made up to the mark with distilled water, mixed, and after 5 min the optical density is measured. violet color of the solution on a photoelectric calorimeter with a green light effector (wavelength of 540 nm) in a cuvette with an absorbing layer thickness of 30 mm relative to distilled water.

The content of nitripotrimethylphosphonic acid is determined according to the calibration curve.

To construct the calibration graph, standard solutions were prepared containing 0.05-0.50 mg nitrile trimethylphosphonic acid in the sample, diluted to 20 ml with distilled water, and then proceeded in the same way as with the analyzed water.

Take j3.

Ammonium Vanadate 2.2 -10, m / l

Salicylhydroxamic acid 6.5 10-, m / l

The ratio of reagents 1:30

Perchloric acid 0,008, m / l

An aliquot portion of the test solution containing 0.1-2.0 mg of hydroxyethylidene diphosphonic (AEOF) acid was placed in a 100-MP heat-resistant glass, diluted to 20 ml with distilled water, 1% O, I M. was added. Perchloric acid was dissolved , 1.7 ml of a 3-10 M ammonium vanadate solution and boil for 5-10 minutes,

After cooling, the solution is transferred to a 50 N volumetric flask, 5 ml of a solution of salicyl hydroxamic acid in glacial acetic acid is added, made up to the mark with distilled water, mixed and after 5 min the optical density is measured. the color of the solution on a photoelectric colorimeter with a green light filter (the length of the probe is 340 nm) in a cuvette with a thickness of 30 mm thick of this layer relative to the bottom of the pressed substrate.

The content of hydroxytilideide (5 phonic acid is found on the t-irradiation schedule.

For construction of the schedule schedule, scaling solutions are prepared.

313960 If-.4

containing 0.1–2.0 mg of oxysulfide density of the solution, o tl and h and h - of d-phosphonic acid in the sample, decreasing in n ft so that, with the aim of gush, melt up to 20 MP with distilled water The determination selectivities, aiaa, and further proceed in the same way as with the analyzed sample are preliminarily treated with 1. treated water. The ammonium vanadate is heated and heated at a pH of 1.5-2.7 and the optical density of the solution is measured in the presence of acid at

The method of quantitative determination of the Q ratio of the concentrations of vanadate of amphosphore containing complexones in catomoni and silicyl hydroxamic acid (to fresh water by optical 1:30 - 1:50.

Comparative results of determination of NTF and OEOF in the presence of phosphate

Claims (1)

Invention Formula