1、BRITISH STANDARD BS 5551-3.4: 1987 ISO 5313:1986 Fertilizers Part 3: Physical properties Section 3.4 Method for determination of oil retention of high nitrogen content, straight ammonium nitrate fertilizers ISO title: High nitrogen content, straight ammonium nitrate fertilizers Determination of oil
2、retention UDC 631.8:53.08 + 631.842.4:665.1BS5551-3.4:1987 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 30 November 1987 BSI 10-1999 The following BSI references relat
3、e to the work on this standard: Committee reference CIC/37 Draft for comment 84/52752 DC ISBN 0 580 15822 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC/37, upon which t
4、he following bodies were represented: Association of Public Analysts Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food The following body was also
5、 represented in the drafting of the standard, through sub-committees and panels: British Society of Rheology Amendments issued since publication Amd. No. Date of issue CommentsBS5551-3.4:1987 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1
6、1 Scope and field of application 1 2 References 1 3 Definition 1 4 Principle 1 5 Reagent 1 6 Apparatus 1 7 Preparation of test sample 1 8 Procedure 1 9 Expression of results 2 10 Test report 2 Publications referred to Inside back coverBS5551-3.4:1987 ii BSI 10-1999 National foreword This Section of
7、BS5551 has been prepared under the direction of the Chemicals Standards Committee. For some years the United Kingdom has participated in the standardization of methods for determining physical properties of fertilizers through Subcommittee3, Physical properties, of Technical Committee134, Fertilizer
8、s and soil conditioners, of the International Organization for Standardization (ISO). As international agreement is reached on the methods, it is proposed to publish them as Sections of BS5551. The standard is published in four Parts, each Part being subdivided into Sections and, where appropriate,
9、subsections. The four Parts are: Part 1: Terminology and labelling; Part 2: Sampling; Part 3: Physical properties; Part 4: Chemical analysis. This Section of Part3 is identical withISO5313:1986 “High nitrogen content, straight ammonium nitrate fertilizers Determination of oil retention”. Terminology
10、 and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma h
11、as been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. The symbol “ml” has been used to denote millilitre. In British Standards it is current practice to use the symbol “mL”. In British Standards it is current practice
12、 to use the spelling “sulphur”, etc., instead of “sulfur”, etc. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross references. With reference to the test sieve complying with ISO3310-1:1982 specified in 6.4, a test sieve o
13、f aperture size 500 4m complying with BS410:1986 “Specification for test sieves” is suitable. ISO 8358 is in preparation. Until it is available, guidance on sampling and sample preparation can be found in BS5309 “Methods for sampling chemical products”, Part 1 “Introduction and general principles”,
14、and BS5309-4 “Sampling of solids”. Additional information. This British Standard describes a method of test only and should not be used as a specification defining physical characteristics. Reference to the standard should indicate that the method of test used is in accordance with BS5551-3.4. A Bri
15、tish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fro
16、nt cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5551-3.4:1987 BSI 10-1999 1 0
17、Introduction The porosity of a high nitrogen content, straight ammonium nitrate fertilizer can be measured by means of the determination of the gas oil retention, called by convention oil retention. The method specified in this International Standard is an empirical method, requiring the minimum of
18、apparatus, and gives results with an acceptable level of reproducibility. 1 Scope and field of application This International Standard specifies a method for the determination of the gas oil retention of solid, high nitrogen content, straight ammonium nitrate fertilizers. The method is applicable to
19、 fertilizers which do not contain materials soluble in gas oil and which are prilled or granular. 2 References ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. ISO 8358, Fertilizers Preparation of samples for analysis 1) . 3 Definition oil retention
20、 of a high nitrogen content, straight ammonium nitrate fertilizer the quantity of gas oil retained by the fertilizer determined under the conditions specified it is expressed as a percentage by mass 4 Principle Total immersion of a test portion in gas oil for a specified period, followed by the drai
21、ning away and the removal of surplus gas oil under specified conditions. Measurement of the increase in mass of the test portion. 5 Reagent Gas oil Viscosity: 1,3 to 5,0 mPas (1,6 to 6,0 cSt) at 40 C Density: 0,82 to 0,86 g/ml at 15 C Sulfur content u 1,0 % (m/m) Ash u 0,1 % (m/m) The density of the
22、 gas oil shall be mentioned in the test report. 6 Apparatus Ordinary laboratory apparatus, and 6.1 Balance, capable of weighing to the nearest0,01g. 6.2 Beaker, of capacity 500ml. 6.3 Funnel, of plastics material, preferably with a cylindrical wall at the upper end, diameter approximately 200mm. 6.4
23、 Test sieve, complying with ISO 3310-1, aperture size 0,5mm, fitting into the funnel (6.3). 6.5 Filter paper, rapid filtering grade, crped, soft, of surface density 150g/m 2 . 7 Preparation of test sample Prepare the test sample in accordance with ISO8358. 8 Procedure 8.1 Sieve the test sample using
24、 the test sieve (6.4) to remove particles less than 0,5mm. Weigh, to the nearest 0,01g, approximately 50g of the sieved test sample into the beaker (6.2). Add sufficient of the gas oil (clause 5) to cover the test portion completely and agitate very gently to ensure that all surfaces are covered. Al
25、low the beaker to stand at a temperature of 25 2 C for1h. 8.2 Fit the test sieve (6.4) into the funnel (6.3). Transfer the contents of the beaker quantitatively onto the test sieve. Distribute the fertilizer on the surface of the sieve. Incline the funnel with the test sieve and allow to drain for 1
26、h to remove the majority of the excess gas oil. 8.3 Spread the test portion quantitatively on a double sheet of filter paper (6.5) and cover with a similar double sheet. Remove any excess surface gas oil by gently rolling flat the test portion between the sheets of filter paper. Repeat this operatio
27、n with fresh sheets of filter paper until there are no visible traces of gas oil on them. NOTEThe treatment with filter paper should be performed carefully in order to prevent crushing of granules. 8.4 Weigh the test portion and the gas oil retained by the granules to the nearest 0,01g immediately a
28、fter rolling. 8.5 Carry out two determinations in rapid succession on separate test portions taken from the same test sample. 1) At present at the stage of draft.BS5551-3.4:1987 2 BSI 10-1999 9 Expression of results 9.1 Method of calculation and formula The oil retention, expressed as a percentage b
29、y mass of fertilizer, is given by the formula where Take as the result the arithmetic mean of the two determinations if the requirement concerning repeatability (see9.2) is satisfied. Otherwise, carry out two further determinations. 9.2 Repeatability The difference between the results of two determi
30、nations, obtained simultaneously or in rapid succession by the same analyst, using the same apparatus, on identical test material, under the same operating conditions, should not exceed 0,3where is the arithmetic mean of two determinations, at a confidence level of 95%. 9.3 Reproducibility The diffe
31、rence between the results of two determinations, obtained by different analysts in different laboratories, on identical test material, should not exceed 0,8where is the arithmetic mean of two determinations, at a confidence level of95%. 10 Test report The test report shall include the following part
32、iculars: a) the reference to the method used; b) the identification of the test sample; c) the density of the gas oil; d) the result and the method of expression; e) any unusual features noted during the determination; f) any operation not included in this International Standard or regarded as optio
33、nal. m 1 is the mass, in grams, of the sieved test portion (8.1); m 2 is the mass, in grams, of the test portion and the retained gas oil (8.4). m 2 m 1 m 1 -100 x, x x, xBS5551-3.4:1987 BSI 10-1999 Publications referred to See national foreword.BS 5551-3.4: 1987 ISO 5313:1986 BSI 389 Chiswick High
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