GOST 27225-87

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  ГОСТ 27225-87

GOST 27225−87 calcium Babbits. Method of atomic-absorption determination of magnesium, copper and aluminium (with Change No. 1)

GOST 27225−87

Group B59

INTERSTATE STANDARD

CALCIUM BABBITS

Method of atomic-absorption determination of magnesium, copper and aluminium

Lead-calcium bearing alloys. Determination of magnesium, copper and aluminium. Atomic absorption method

AXTU 1709

Date of introduction 1988−07−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Railways of the USSR

DEVELOPERS

V. F. Baraboshin, PhD. tech. Sciences; V. N. Rodionova (supervisor); V. D. Chernikov, A. V. Velikanov, T. A. Dubrovitskiy

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 24.03.87 N 862

The change in N 1 taken by the Interstate Council for standardization, Metrology and certification (Protocol No. 6 dated 21.10.94)

The adoption voted:

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 2−92 of the Interstate Council for standardization, Metrology and certification (ICS 2−93)

6. REPRINT (June 1999) with amendment No. 1 adopted in March 1996 (IUS 6−96)


This standard establishes the atomic absorption method for the determination of copper (from 0.01 to 0.20%), magnesium (from 0.01 to 0.20%), aluminium (0.02 to 0.20%) in calcium babbits according to GOST 1209.

The method is based on measuring the absorption of light by atoms of the designated components formed during the introduction of the analyzed solution in the flame of air-acetylene or mixture of acetylene with nitrous oxide.

The method used in the differences in assessing the quality of calcium babbits.

1. GENERAL REQUIREMENTS

General requirements for method of analysis according to GOST 25086 with the addition of: sampling and sample preparation — according to GOST 1209.

The numerical value of the result of the analysis must end with a digit of the same rank as that of the normalized indicator of the grade composition is given in GOST 1209.

2. APPARATUS, REAGENTS AND SOLUTIONS

Atomic absorption spectrophotometer.

Lamp with hollow cathode.

Nitric acid according to GOST 4461, diluted 1:1 and 1:3.

Hydrochloric acid according to GOST 3118, diluted 1:1.

Acetylene according to GOST 5457.

Nitrous oxide according to GOST 9293.

Lead according to GOST 3778*.
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* On the territory of the Russian Federation GOST 3778−98. — Note the manufacturer’s database.

Standard lead solution: 10 g of lead dissolved by heating at 60−80 cmof nitric acid (1:1). The solution after cooling is transferred to a volumetric flask with a capacity of 100 cmand top up with water to the mark.

1 cmof the solution contains 0.1 g of lead.

Magnesium GOST 804.

Standard solutions of magnesium

Solution a: 1 g of the magnesium pre-protravnogo and dried, dissolved in 20 cmof nitric acid (1:1). The solution after cooling is transferred into a measuring flask with volume capacity of 1000 cmand topped to the mark with water.

1 cmof the solution contains 0.001 g of magnesium.

Solution B: 10 cmsolution And transferred to a volumetric flask with a capacity of 100 cmand then filled to the mark with water.

1 cmof the solution contains 0.0001 g of magnesium.

Solution: 10 cmof a solution transferred to a volumetric flask with a capacity of 100 cmand then filled to the mark with water.

1 cmof the solution contains 0,00001 g of magnesium.

Copper according to GOST 859*.
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* On the territory of the Russian Federation GOST 859−2001. — Note the manufacturer’s database.

Standard solutions of copper

Solution a: 1 g of copper is dissolved in 20 cmof nitric acid (1:1). The solution is transferred into a measuring flask with volume capacity of 1000 cmand topped to the mark with water.

1 cmof the solution contains 0.001 g of copper.

Solution B: 10 cmsolution And transferred to a volumetric flask with a capacity of 100 cmand then filled to the mark with water.

1 cmof the solution contains 0.0001 g of copper.

Aluminum grade 999 according to GOST 11069*.
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* On the territory of the Russian Federation GOST 11069−2001. — Note the manufacturer’s database.

Standard solutions of aluminium

Solution a: 1 g of aluminium is dissolved in 20 cmof hydrochloric acid (1:1). The solution after cooling is transferred into a measuring flask with volume capacity of 1000 cmand topped to the mark with water.

1 cmof the solution contains 0.001 g of aluminium.

Solution B: 10 cmsolution And transferred to a volumetric flask with a capacity of 100 cmand then filled to the mark with water.

1 cmof the solution contains 0.0001 g of aluminum.

3. ANALYSIS

3.1. A sample of alloy weighing 2 g were placed in a glass with a capacity of 200 cmand dissolved in 40−50 cmof nitric acid (1:3) under low heat. The solution was transferred to a volumetric flask with a capacity of 100 cmand then filled to the mark with water.

For the determination of magnesium and copper take aliquote part of the solution in a volumetric flask with a capacity of 100 cmin accordance with table.1, for the determination of aluminum using the entire solution.

Table 1

3.2. Preparation of the calibration solutions

In a volumetric flask with a capacity of 100 cmpoured aliquote volumes of standard solutions of components listed in the table.2, and topped to the mark with water. For the determination of aluminium in each flask poured with 20 cmof a standard solution of lead.

Table 2

3.3. Measurements

Include the source of resonance radiation and establish supply current (specified on the label of the lamp or in the description of the corresponding device). Derive the analytical line of the designated component. The conditions define the components given in table.3.

Table 3

Sprayed sequentially in the flames of the solutions of the analyzed sample and calibration solutions and record the values of analytical signals.

4. PROCESSING OF THE RESULTS

4.1. Mass fraction of components in the alloy find the calibration schedule, delaying on the x-axis mass fraction of the designated component in the calibration solutions, and the y — axis the corresponding values of the analytical signals.

Mass fraction of a chemical element , %, is calculated by the formula

,

where  — mass fraction of a chemical element, was found in the calibration schedule g;

 — weight aliquote part of the solution,

4.2. Control of accuracy of analysis results

The results of the analysis are considered accurate if they do not exceed the values specified in table.4.

Table 4

4.3. Control the accuracy of the results of the analysis may be performed on standard samples of the enterprise (SOP), approved by GOST 8.315, in accordance with GOST 25086. The error of determination shall not exceed the values given in table.4.

4.1−4.3. (Changed edition, Rev. N 1).