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The European Standard EN 12048 : 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
Confirmed June 2011
Trang 2BS EN 12048 : 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
Draft for comment 91/52766 DC
ISBN 0 580 27410 1
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 3 BSI 1997 i
Contents
Page
Method
Annexes
Trang 4ii BSI 1997
BS EN 12048 : 1997
National foreword
This British Standard has been prepared by Technical Committee CII/37 and is the
English language version of EN 12048 : 1996 Solid fertilizers and liming materials Ð
Determination of moisture content Ð Gravimetric method by drying at (105±2) ÊC (ISO 8190 : 1992 modified), published by the European Committee for
Standardization (CEN) It supersedes BS 5551 : Subsection 4.4.2 : 1993, which is withdrawn
EN 12048 was produced as a result of international discussion in which the United Kingdom took an active part
Cross-references
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 4, 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 12048 : 1996 E
ICS 65.080
Descriptors: Fertilizers, tests, drying, determination, humidity, gravimetric analysis
English version
Solid fertilizers and liming materials Ð Determination of moisture content Ð Gravimetric method by drying at (105 ± 2) ÊC
(ISO 8190 : 1992 modified) Engrais solides et amendements calciques et/ou
magneÂsiens Ð DeÂtermination de la teneur en eau
Ð MeÂthode gravimeÂtrique par seÂchage aÁ
(105±2) ÊC
(ISO 8190 : 1992 modifieÂe)
Feste DuÈngemittel und Calcium-/Magnesium-Bodenverbesserungsmittel Ð Bestimmung des Feuchtegehaltes Ð Gravimetrisches Verfahren durch Trocknung bei (105±2) ÊC
(ISO 8190 : 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 12048 : 1996
BSI 1997
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 8190 : 1992 was
approved by CEN as a European Standard with agreed
common modifications as given below
± The title and scope of the standard have been
extended to include liming materials
± 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 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 7 BSI 1997
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1 Scope
This European Standard specifies a gravimetric
method, by drying at (105±2) ÊC, for the
determination of the moisture content of fertilizers and
liming materials
The method is applicable to siliceous and carbonic
liming materials and the following phosphatic
fertilizers:
± superphosphates;
± natural phosphates;
± ground rock phosphates;
± partially solubilized rock phosphates
The method is not applicable to hydrated or burnt
lime, and to ammonium compounds or magnesium
sulfates
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 (105±2) ÊC for 5 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 (5.3) and
transferring the basin to the oven (5.4), set at 105 ÊC,
for 2 h Transfer the basin with its contents to a
desiccator and allow to cool to ambient temperature
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 Evaporating basin, internal diameter
about 100 mm
5.4 Oven, capable of being controlled at (105±2) ÊC.
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6 Preparation of the 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
Dry the weighing bottle (5.1) in the oven (5.4), set
at 105 ÊC, for 2 h Allow to cool to ambient temperature
in a desiccator Weigh to the nearest 0,001 g about 10 g
of the test sample into the tared weighing bottle
7.2 Determination
Place the unstoppered weighing bottle (5.1) containing the test portion, and the stopper, in the oven (5.4), set
at 105 ÊC, for 5 h Transfer the weighing bottle and the
stopper to the desiccator (5.2) and allow to cool to
ambient temperature Open the desiccator, quickly restopper the weighing bottle and weigh the bottle and its contents to the nearest 0,001 g
8 Expression of results
The moisture content of the fertilizer or of the liming material, 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).
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 8Page 4
EN 12048 : 1996
BSI 1997
Annex A (informative)
Precision
A.1 General
The following precision data were determined from an
experiment conducted in 1982 involving 21 laboratories
using one sample of each of the following fertilizers:
ammonium sulfate; natural phosphate;
superphosphate 18 % (granular and also powdered)
The method used employed the grinding and sieving of
the sample whereas the published method involves
crushing, and therefore these data 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 = 0,15√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 = 0,6√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 Simple sampling method for small
lots
Trang 9 BSI 1997
List of references
See national foreword
Trang 10389 Chiswick High Road
London
W4 4AL
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