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GOST 20996.5-82

GOST 33729-2016 GOST 20996.3-2016 GOST 31921-2012 GOST 33730-2016 GOST 12342-2015 GOST 19738-2015 GOST 28595-2015 GOST 28058-2015 GOST 20996.11-2015 GOST 9816.5-2014 GOST 20996.12-2014 GOST 20996.7-2014 GOST P 56306-2014 GOST P 56308-2014 GOST 20996.1-2014 GOST 20996.2-2014 GOST 20996.0-2014 GOST 16273.1-2014 GOST 9816.0-2014 GOST 9816.4-2014 GOST P 56142-2014 STATE STANDARD P 54493-2011 GOST 13498-2010 STATE STANDARD P 54335-2011 GOST 13462-2010 STATE STANDARD P 54313-2011 GOST P 53372-2009 GOST P 53197-2008 GOST P 53196-2008 GOST P 52955-2008 GOST P 50429.9-92 GOST 6836-2002 GOST 6835-2002 GOST 18337-95 GOST 13637.9-93 GOST 13637.8-93 GOST 13637.7-93 GOST 13637.6-93 GOST 13637.5-93 GOST 13637.4-93 GOST 13637.3-93 GOST 13637.2-93 GOST 13637.1-93 GOST 13637.0-93 STATE STANDARD 13099-2006 GOST 13098-2006 GOST 10297-94 GOST 12562.1-82 GOST 12564.2-83 GOST 16321.2-70 GOST 4658-73 GOST 12227.1-76 GOST 16274.0-77 GOST 16274.1-77 GOST 22519.5-77 GOST 22720.4-77 GOST 22519.4-77 GOST 22720.2-77 GOST 22519.6-77 GOST 13462-79 GOST 23862.24-79 GOST 23862.35-79 GOST 23862.15-79 GOST 23862.29-79 GOST 24392-80 GOST 20997.5-81 GOST 24977.1-81 GOST 25278.8-82 GOST 20996.11-82 GOST 25278.5-82 GOST 1367.7-83 GOST 26239.9-84 GOST 26473.1-85 GOST 16273.1-85 GOST 26473.2-85 GOST 26473.6-85 GOST 25278.15-87 GOST 12223.1-76 GOST 12645.7-77 GOST 12645.1-77 GOST 12645.6-77 GOST 22720.3-77 GOST 12645.4-77 GOST 22519.7-77 GOST 22519.2-77 GOST 22519.0-77 GOST 12645.5-77 GOST 22517-77 GOST 12645.2-77 GOST 16274.9-77 GOST 16274.5-77 GOST 22720.0-77 GOST 22519.3-77 GOST 12560.1-78 GOST 12558.1-78 GOST 12561.2-78 GOST 12228.2-78 GOST 18385.4-79 GOST 23862.30-79 GOST 18385.3-79 GOST 23862.6-79 GOST 23862.0-79 GOST 23685-79 GOST 23862.31-79 GOST 23862.18-79 GOST 23862.7-79 GOST 23862.1-79 GOST 23862.20-79 GOST 23862.26-79 GOST 23862.23-79 GOST 23862.33-79 GOST 23862.10-79 GOST 23862.8-79 GOST 23862.2-79 GOST 23862.9-79 GOST 23862.12-79 GOST 23862.13-79 GOST 23862.14-79 GOST 12225-80 GOST 16099-80 GOST 16153-80 GOST 20997.2-81 GOST 20997.3-81 GOST 24977.2-81 GOST 24977.3-81 GOST 20996.4-82 GOST 14338.2-82 GOST 25278.10-82 GOST 20996.7-82 GOST 25278.4-82 GOST 12556.1-82 GOST 14339.1-82 GOST 25278.9-82 GOST 25278.1-82 GOST 20996.9-82 GOST 12554.1-83 GOST 1367.4-83 GOST 12555.1-83 GOST 1367.6-83 GOST 1367.3-83 GOST 1367.9-83 GOST 1367.10-83 GOST 12554.2-83 GOST 26239.4-84 GOST 9816.2-84 GOST 26473.9-85 GOST 26473.0-85 GOST 12645.11-86 GOST 12645.12-86 GOST 8775.3-87 GOST 27973.0-88 GOST 18904.8-89 GOST 18904.6-89 GOST 18385.0-89 GOST 14339.5-91 GOST 14339.3-91 GOST 29103-91 GOST 16321.1-70 GOST 16883.2-71 GOST 16882.1-71 GOST 12223.0-76 GOST 12552.2-77 GOST 12645.3-77 GOST 16274.2-77 GOST 16274.10-77 GOST 12552.1-77 GOST 22720.1-77 GOST 16274.4-77 GOST 16274.7-77 GOST 12228.1-78 GOST 12561.1-78 GOST 12558.2-78 GOST 12224.1-78 GOST 23862.22-79 GOST 23862.21-79 GOST 23687.2-79 GOST 23862.25-79 GOST 23862.19-79 GOST 23862.4-79 GOST 18385.1-79 GOST 23687.1-79 GOST 23862.34-79 GOST 23862.17-79 GOST 23862.27-79 GOST 17614-80 GOST 12340-81 GOST 31291-2005 GOST 20997.1-81 GOST 20997.4-81 GOST 20996.2-82 GOST 12551.2-82 GOST 12559.1-82 GOST 1089-82 GOST 12550.1-82 GOST 20996.5-82 GOST 20996.3-82 GOST 12550.2-82 GOST 20996.8-82 GOST 14338.4-82 GOST 25278.12-82 GOST 25278.11-82 GOST 12551.1-82 GOST 25278.3-82 GOST 20996.6-82 GOST 25278.6-82 GOST 14338.1-82 GOST 14339.4-82 GOST 20996.10-82 GOST 20996.1-82 GOST 12645.9-83 GOST 12563.2-83 GOST 19709.1-83 GOST 1367.11-83 GOST 1367.0-83 GOST 19709.2-83 GOST 12645.0-83 GOST 12555.2-83 GOST 1367.1-83 GOST 9816.3-84 GOST 9816.4-84 GOST 9816.1-84 GOST 9816.0-84 GOST 26468-85 GOST 26473.11-85 GOST 26473.12-85 GOST 26473.5-85 GOST 26473.7-85 GOST 16273.0-85 GOST 26473.3-85 GOST 26473.8-85 GOST 26473.13-85 GOST 25278.13-87 GOST 25278.14-87 GOST 8775.1-87 GOST 25278.17-87 GOST 18904.1-89 GOST 18904.0-89 STATE STANDARD P 51572-2000 GOST 14316-91 GOST P 51704-2001 GOST 16883.1-71 GOST 16882.2-71 GOST 16883.3-71 GOST 8774-75 GOST 12227.0-76 GOST 12797-77 GOST 16274.3-77 GOST 12553.1-77 GOST 12553.2-77 GOST 16274.6-77 GOST 22519.1-77 GOST 16274.8-77 GOST 12560.2-78 GOST 23862.11-79 GOST 23862.36-79 GOST 23862.3-79 GOST 23862.5-79 GOST 18385.2-79 GOST 23862.28-79 GOST 16100-79 GOST 23862.16-79 GOST 23862.32-79 GOST 20997.0-81 GOST 14339.2-82 GOST 12562.2-82 GOST 25278.7-82 GOST 20996.12-82 GOST 12645.8-82 GOST 20996.0-82 GOST 12556.2-82 GOST 25278.2-82 GOST 12564.1-83 GOST 1367.5-83 GOST 25948-83 GOST 1367.8-83 GOST 1367.2-83 GOST 12563.1-83 GOST 9816.5-84 GOST 26473.4-85 GOST 26473.10-85 GOST 12645.10-86 GOST 8775.2-87 GOST 25278.16-87 GOST 8775.0-87 GOST 8775.4-87 GOST 12645.13-87 GOST 27973.3-88 GOST 27973.1-88 GOST 27973.2-88 GOST 18385.6-89 GOST 18385.7-89 GOST 28058-89 GOST 18385.5-89 GOST 10928-90 GOST 14338.3-91 GOST 10298-79 GOST P 51784-2001 GOST 15527-2004 GOST 28595-90 GOST 28353.1-89 GOST 28353.0-89 GOST 28353.2-89 GOST 28353.3-89 STATE STANDARD P 52599-2006

GOST 20996.5−82 Selenium technical. Method for the determination of organic substances (with Amendments No. 1, 2)


GOST 20996.5−82*

Group B59

INTERSTATE STANDARD

SELENIUM TECHNICAL

Method for the determination of organic substances

Selenium.
Method of organic materials determination

AXTU 1709

Date of introduction 1983−07−01

Resolution of the USSR State Committee on standards of 22 June 1982, N 2481 date of introduction is established 01.07.83

Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

* PUBLISHING (may 2000) with amendment No. 1, approved in December 1987 (IUS 3−88)


The Change N 2, approved and promulgated by the Order of Rosstandart from 26.11.2014 No. 1761-St c 01.09.2015

Change No. 2 made by the manufacturer of the database in the text IUS N 3, 2015


This standard specifies the gravimetric method for the determination of organic matter (mass fraction of organic matter 0,01−0,35%).

The method is based on dissolution of organic impurities in ether or carbon tetrachloride, removing the excess solvent by heating and subsequent weighing of the sediment organic matter.

(Changed edition, Rev. N 1).

1. GENERAL REQUIREMENTS

1.1. General requirements for method of analysis according to GOST 20996.0−82.

1A. NORMATIVE REFERENCES



This standard uses the regulatory references to the following international standards:

GOST 1770−74 laboratory Glassware measuring glass. Cylinders, beakers, flasks, test tubes. General specifications

GOST 20288−74 Reagents. The carbon tetrachloride. Specifications

GOST 20996.0−82 Selenium technical. General requirements for methods of analysis

GOST 24104−2001* laboratory Scales. General technical requirements
_______________
* On the territory of the Russian Federation GOST R 53228−2008 «Scales non-automatic actions. Part 1. Metrological and technical requirements. Test».


GOST 25336−82 Glassware and equipment laboratory glass. The types, basic parameters and dimensions

GOST ISO 5725−6-2002** Accuracy (trueness and precision) of methods and measurement results. Part 6. The use of precision values in practice
_______________
** On the territory of the Russian Federation GOST R ISO 5725−6-2002 «Accuracy (trueness and precision) of methods and measurement results. Part 6. The use of precision values in practice».


Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or published annually by the information sign «National standards» published as on January 1 of the current year and related information published monthly indexes published in the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.


Section 1A (Introduced later, Rev. N 2).

1B. CHARACTERISTICS OF INDICATORS OF MEASUREMENT ACCURACY



A measure of the accuracy of measuring the mass fraction of organic substances corresponds to the characteristics given in table 1 (if ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of 0.95).

Limit values of repeatability and reproducibility of measurements for a confidence probability ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of 0.95 is given in table 1.


Table 1

Percentage

       
Measurement range of mass fraction of organic substances

The accuracy rate of ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)

Limits (absolute values)
   

repeatability ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)(ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)2)

reproducibility ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)

From 0.010 to 0.050 incl. 0,009 0,008
0,010
SV. 0,050 «0,10 « 0,03 0,02
0,04
«0,10» 0,35 « 0,06 0,05
0,08
«0,35 0,07 0,08
0,10


Section 1B (Introduced later, Rev. N 2).

2. MEASUREMENT MEANS, AUXILIARY DEVICES, MATERIALS, SOLUTIONS


When performing measurements using the following measuring instruments and auxiliary devices:

— laboratory drying oven with thermostatic control, ensuring the heating temperature up to 250 °C;

— the stove is electric with a closed heating element for temperature up to 400 °C;

— special laboratory scales of accuracy class according to GOST 24104;

cylinders measuring stoppered 2−50−2 according GOST 1770;

— glasses-1−100 TCS according to GOST 25336;

— dryer 1−100 GOST 25336;

— bath water;

filters obestochennye [1] or similar.

When taking measurements, use the following products and solutions:

— carbon tetrachloride according to GOST 20288;

— diethyl ether medical.

Notes:

1. Allowed the use of other measuring instruments of the approved type, auxiliary devices and materials, technical and metrological characteristics are not inferior to mentioned above.

2. Allowed the use of reagents produced by other normative documents, provided that their metrological characteristics of the measurement results given in the measurement technique.

(Changed edition, Rev. N 2).

3. ANALYSIS

Selena weighed weighing 5 or 10 grams (depending on the mass fraction of organic substances) is placed in a measuring cylinder with a glass stopper with a capacity of 50 cmГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2), flow 30−40 cmГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of ether or carbon tetrachloride and shaken intensively for 5 min.

After separation the organic layer was filtered through a loose folded filter into a previously dried and weighed glass with a capacity of 100 cmГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2), wash the cylinder and filter with 2−3 servings 3−5 cmГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of solvent.

Then the beaker placed in a water bath and carefully evaporate the solution to dryness.

The glass is placed in a drying Cabinet and dried residue for 20−30 min at 100−105 °C.

After cooling, weigh the beaker with the residue. Drying the residue and weighing of the glass is continued until obtaining constant weight.

4. PROCESSING OF THE RESULTS

4.1. Mass share of organic substances (ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)) in percent is calculated by the formula

ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2),


where ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)is the mass of the glass residue, g;

ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2) — the mass of the glass without residue, g;

ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2) — weight of selenium,

4.2. The measurement results take the arithmetic mean of two parallel definitions, provided that the absolute difference between them in terms of repeatability does not exceed the values (with confidence probability ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of 0.95) limit of repeatability ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)in table 1.

If the difference between the highest and lowest results of parallel measurements exceeds the limit value of the frequency of occurrence, perform the procedure described in GOST ISO 5725−6 (paragraph 5.2.2.1).

(Changed the wording. Izm. N 1, 2).

4.3. The absolute value allowable discrepancies between the two measurement results obtained in different laboratories, should not exceed the limit values for the reproducibility given in table 1 (at confidence probability ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)of 0.95). At default of this condition can be used the procedure set out in GOST ISO 5725−6.

(Added, Rev. N 2).

BIBLIOGRAPHY

     
[1]

Specifications
THAT 264221−001−05015242−07*ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)

Obestochennye filters (white, red, blue tape)

_______________
* Valid on the territory of the Russian Federation.

ГОСТ 20996.5-82 Селен технический. Метод определения органических веществ (с Изменениями N 1, 2)The one mentioned here, are not given. For additional information, please refer to the link. — Note the manufacturer’s database.

Bibliography (added, Rev. N 2).