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Commission Regulation (EC) No 152/2009Show full title
Commission Regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed (Text with EEA relevance)
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- Revised 16/11/20202.10 MB
- Revised 24/05/20171.85 MB
- Revised 26/04/20171.62 MB
- Revised 17/07/20142.16 MB
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- Revised 12/02/20132.46 MB
- Revised 18/04/20122.15 MB
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O.DETERMINATION OF CARBONATESU.K.
1.Purpose and ScopeU.K.
This method makes it possible to determine the amount of carbonates, conventionally expressed as calcium carbonate, in most feed.
However in certain cases (for example, with iron carbonate) a special method must be used.
2.PrincipleU.K.
The carbonates are decomposed in hydrochloric acid; the carbon dioxide released is collected in a graduated tube, and its volume compared with that released under the same conditions by a known quantity of calcium carbonate.
3.ReagentsU.K.
3.1.Hydrochloric acid, density 1,1 g/ml.U.K.
3.2.Calcium carbonate.U.K.
3.3.Sulphuric acid, approximately 0,05 mol/litre, coloured with methyl red.U.K.
4.ApparatusU.K.
Scheibler-Dietrich apparatus (see diagram) or equivalent apparatus.
5.ProcedureU.K.
According to the sample's carbonate content, weigh a portion of the sample as shown below:
0,5 g for products containing from 50 % to 100 % of carbonates, expressed as calcium carbonate,
1 g for products containing from 40 % to 50 % of carbonates, expressed as calcium carbonate,
2 to 3 g for other products.
Place the portion of the sample in the special flask (4) of the apparatus, fitted with a small tube of unbreakable material containing 10 ml of hydrochloric acid (3.1), and connect the flask to the apparatus. Turn the three-way cock (5) so that the tube (1) connects with the outside. Using the mobile tube (2), which is filled with coloured sulphuric acid (3.3) and connected to the graduated tube (1), bring the level of the liquid up to the zero mark. Turn the cock (5) in order to connect up tubes (1) and (3) and check that the level is at zero.
Run the hydrochloric acid (3.1) slowly over the portion of the sample, tilting the flask (4). Make the pressure equal by lowering the tube (2). Shake the flask (4) until the release of carbon dioxide has stopped completely.
Restore pressure by bringing the liquid back to the same level in tubes (1) and (2). After a few minutes, when the volume of gas has become constant, take the reading.
Carry out a control test in the same conditions on 0,5 g of calcium carbonate (3.2).
6.Calculation of resultsU.K.
The content of carbonates, expressed as calcium carbonate, is calculated by using the formula:
where:
X
=
% (w/w) of carbonates in the sample, expressed as calcium carbonate
V
=
ml of CO2 released by the portion of the sample.
V1
=
ml of CO2 released by 0,5 g of CaCO3.
m
=
weight, in grammes, of the portion of the sample.
7.ObservationsU.K.
7.1.When the portion of the sample weighs more than 2 g, first place 15 ml of distilled water in the flask (4) and mix before beginning the test. Use the same volume of water for the control test.U.K.
7.2.If the apparatus used has a different volume from that of the Scheibler-Dietrich apparatus, the portions taken from the sample and from the control substance and the calculation of the results must be adapted accordingly.U.K.
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