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12049 : 1997
The European Standard EN 12049 : 1996 has the status of a
British Standard
ICS 65.080
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
Solid fertilizers and liming
materials Ð
Determination of moisture
content Ð
Gravimetric method by drying
under reduced pressure
Confirmed June 2011
Trang 2BS EN 12049 : 1997
This British Standard, having
been prepared under the
direction of the Sector Board for
Materials and Chemicals, was
published under the authority of
the Standards Board and comes
into effect on
15 June 1997
BSI 1997
The following BSI references
relate to the work on this
standard:
Committee reference CII/37
Amendments issued since publication
Committees responsible for this British Standard
The preparation of this British Standard was entrusted to Technical Committee CII/37, Fertilizers and related chemicals, upon which the following bodies were represented:
Association of Public Analysts British Aggregate Construction Materials Industries British Coal Corporation
Chemical Industries' Association Consumers' Association
Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd
Horticultural Trades Association Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food Water Services Association of England and Wales
Trang 3BS EN 12049 : 1997
Contents
Page
Method
Annexes
Trang 4BS EN 12049 : 1997
National foreword
This British Standard has been prepared by Technical Committee CII/37 and is the
English language version of EN 12049 : 1996 Solid fertilizers and liming materials Ð
Determination of moisture content Ð Gravimetric method by drying under reduced pressure, published by the European Committee for Standardization (CEN) It
supersedes BS 5551 : Subsection 4.4.1 : 1993, which is withdrawn
EN 12049 was produced as a result of international disucssion in which the United Kingdom took an active part It was derived by CEN from ISO 8189 : 1992 published by the International Organization for Standardization (ISO)
Cross-reference
Publication referred to Corresponding British Standard
EN 1482 : 1996 BS EN 1482 : 1996 Sampling of solid fertilizers and liming
materials
Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover
Trang 5European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈr Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
1996 All rights of reproduction and communication in any form and by any means reserved to CEN and its members
Ref No EN 12049 : 1996 E
ICS 65.080
Descriptors: Fertilizers, tests, determination, humidity, gravimetric analysis
English version
Solid fertilizers and liming materials Ð Determination of moisture content Ð Gravimetric method by drying under reduced pressure
(ISO 8189 : 1992 modified)
Engrais solides et amendements calciques et/ou
magneÂsiens Ð DeÂtermination de la teneur en eau
Ð MetÂhode gravimeÂtrique par seÂchage sous
pression reÂduite
(ISO 8189 : 1992 modifieÂe)
Feste DuÈngemittel und Calcium-/Magnesium-Bodenverbesserungsmittel Ð Bestimmung des Feuchtegehaltes Ð Gravimetrisches Verfahren durch Trocknung unter reduziertem Druck (ISO 8189 : 1992 modifiziert)
This European Standard was approved by CEN on 1996-03-06 CEN members are
bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
conditions for giving this European Standard the status of a national standard
without any alteration
Up-to-date lists and bibliographical references concerning such national standards
may be obtained on application to the Central Secretariat or to any CEN member
This European Standard exists in three official versions (English, French, German)
A version in any other language made by translation under the responsibility of a
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions
CEN members are the national standards bodies of Austria, Belgium, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom
Trang 6Page 2
EN 12049 : 1996
Foreword
The text of the International Standard from technical
committee ISO/TC 134, Fertilizers and soil
conditioners, of the International Organization for
Standardization (ISO) has been taken over as a
European Standard by the Technical Committee
CEN/TC 260, Fertilizers and liming materials, the
secretariat of which is held by AFNOR
This European Standard shall be given the status of a
national standard, either by publication of an identical
text or by endorsement, at the latest by March 1997,
and conflicting national standards shall be withdrawn
at the latest by March 1997
In accordance with the CEN/CENELEC Internal
Regulations, the following countries are bound to
implement this European Standard: Austria, Belgium,
Denmark, Finland, France, Germany, Greece, Iceland,
Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland, United Kingdom
Endorsement notice
The text of International Standard ISO 8189 : 1992 was
approved by CEN as a European Standard with agreed
common modifications as given below
± The title and scope have been extended to include
liming materials
± In the list of fertilizers to which the method is not
applicable the reference to magnesium sulfate has
been amended to `magnesium sulfate containing one
to seven molecules of water of crystallization for
each molecule of magnesium sulfate'
± In clause 2 and clause 6, the reference to
ISO 8358 : 1991 has been replaced by EN 1482 :
1996
± In clause 9, a requirement to include the method
of sampling and sample preparation in the test
report has been added
± A bibliography has been added as an informative
annex ZA
The common modifications have been inserted in the
text of the reference document and indicated by a
vertical line in the margin
Trang 7Page 3
EN 12049 : 1996
BSI 1997
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1 Scope
This European Standard specifies a gravimetric
method, by drying under reduced pressure, for the
determination of the moisture content of fertilizers and
liming materials
The method is not applicable to fertilizers and liming
materials containing the following:
± calcium nitrate;
± calcium hydroxide;
± calcium sulfate containing less than two molecules
of water of crystallization for each molecule of
calcium sulfate;
± magnesium sulfate containing one to seven
molecules of water of crystallization for each
molecule of magnesium sulfate;
± salts which effloresce readily at ambient
temperatures or those which absorb water
(desiccants)
2 Normative reference
This European Standard incorporates by dated or
undated reference, provisions from other publications
These normative references are cited at the
appropriate places in the text and the publications are
listed hereafter For dated references, subsequent
amendments to or revisions of any of these
publications apply to this European Standard only
when incorporated in it by amendment or revision For
undated references the latest edition of the publication
referred to applies
EN 1482 :
1996
Sampling of solid fertilizers and liming materials
3 Principle
Drying a test portion at a pressure of 66 3 103Pa and a
temperature of 25 ÊC for 24 h and determination of the
resulting loss in mass
4 Material
4.1 Silica gel desiccant, self-indicating, particle
size 2 mm to 5 mm
Activate the silica gel, immediately prior to use, by
placing about 100 g in the evaporating basin (5.4) and
transferring the basin to the oven (5.5), set at 105 ÊC
for 2 h Transfer the basin with its contents to a
desiccator and allow to cool to ambient temperature
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5 Apparatus
Ordinary laboratory apparatus and, in particular, the following:
5.1 Weighing bottle, 70 mm to 80 mm diameter, fitted
with a stopper
5.2 Vacuum desiccator, internal diameter
about 200 mm, containing silica gel desiccant (4.1).
5.3 Vacuum pump, fitted with a pressure gauge.
5.4 Evaporating basin, internal diameter
about 100 mm
5.5 Oven, capable of being controlled at (105±2) ÊC.
6 Preparation of test sample
Prepare the test sample, without grinding, in accordance with EN 1482
If necessary, quickly crush (not grind) the material in a mortar Mix all the material and immediately take the
test portion (7.1).
NOTE 1 It is advisable to crush the material in an atmosphere of relative humidity 40 % to 60 %.
7 Procedure
7.1 Test portion
Remove the stopper from the weighing bottle (5.1) and heat both for 2 h in the oven (5.5) set at 105 ÊC Cool
in the desiccator (5.2) After cooling to room
temperature, fit the stopper and weigh to the nearest 0,001 g Weigh, to the nearest 0,001 g, about 10 g
of the test sample into the prepared weighing bottle, with the stopper placed alongside
7.2 Determination
Place the unstoppered weighing bottle (5.1) containing
the test portion, and the stopper, adjacent to each
other, in the desiccator (5.2) containing the freshly activated silica gel (4.1).
Using the vacuum pump (5.3), reduce the pressure in
the desiccator to an absolute pressure of (66±1,3) 3
103Pa [(500±10) mmHg] and maintain at this pressure for 24 h, at a temperature of (25±3) ÊC.
Warning Before use, it is essential to check that the
vacuum desiccator is free from defects It should be placed behind a safety screen before applying a vacuum and should not be removed until atmospheric pressure has been restored
Allow the pressure inside the desiccator to return to that of the atmosphere by gradually admitting air which has been dried by passage through the activated
silica gel (4.1) Open the desiccator, quickly restopper
the weighing bottle and weigh the bottle, stopper and contents to the nearest 0,001 g
Trang 8Page 4
EN 12049 : 1996
8 Expression of results
The moisture content of the fertilizer, expressed as a
percentage by mass, is given by the formula:
3 100
m02 m1
m0
where:
m0 is the mass, in grams, of the test portion before
drying;
m1 is the mass, in grams of the test portion after
drying
Round the result, the mean of at least two
determinations, to 0,1 % (m/m).
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9 Test report
The test report shall include the following information: a) a reference to this European Standard;
b) the method of sampling and sample preparation; c) the results and the method of expression used; d) all information necessary for the complete identification of the sample;
e) any unusual features noted during the determination;
f) any operation not included in this European Standard or in the European Standard to which reference is made, or regarded as optional
Trang 9Page 5
EN 12049 : 1996
BSI 1997
Annex A (informative)
Precision
A.1 General
The precision data were determined from an
experiment conducted in 1979 involving 21 laboratories
using one sample of each of five different types of
fertilizer Since it is not certain whether these data are
valid for all fertilizers to which this international
standard applies, they are included for information
only
A.2 Repeatability
The difference between two single test results obtained
from identical test material by one analyst using the
same apparatus within a short time-interval should
exceed the repeatability limit, r, given by the following
equation, on average not more than once in 20 cases in
the normal and correct operation of the method
r = 0,1√m
where:
m is the arithmetic mean of the two test results
(i.e two determinations)
A.3 Reproducibility
The difference between two single and independent
test results found by two analysts working in different
laboratories using identical test material should exceed
the reproducibility limit, R, given by the following
equation, on average not more than once in 20 cases in
the normal and correct operation of the method
R = 0,4√M
where:
M is the arithmetic mean of the two test results
(i.e two determinations)
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Annex ZA (informative) Bibliography
ISO 3963 : 1977 Fertilizers ± Sampling from a
conveyor by stopping the belt
ISO 7742 : 1988 Solid fertilizers ± Reduction of
samples
ISO 8633 : 1992 Solid fertilizers Ð Simple
sampling method for small lots
Trang 11 BSI 1997
BS EN 12049 : 1997
List of references
See national foreword
Trang 12389 Chiswick High Road
London
W4 4AL
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