1、BRITISH STANDARD BS 5551-4.3.2: 1983 ISO 7407:1983 Fertilizers Part 4: Chemical analysis Section 4.3 Determination of potassium Subsection 4.3.2 Preparation of the test solution for determination of acid-soluble potassium content ISO title: Fertilizers Determination of acid-soluble potassium content
2、 Preparation of the test solution UDC 631.8:543.06:546.32BS5551-4.3.2:1983 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Board of BSIandcomes into effect on 30 December1983 BSI 12-1999 The following BSI ref
3、erences relate to the work on this standard: Committee reference CIC/37 Draft for comment 82/51198 DC ISBN 0 580 13635 3 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
4、upon which the following bodies were represented: Association of Public Analysts British Agrochemicals Association Department of Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Institute of Trading Standards Administration Ministry of Agriculture, Fisheries
5、and Food Amendments issued since publication Amd. No. Date of issue CommentsBS5551-4.3.2:1983 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Principle 1 3 Reagent 1 4 Apparatus 1 5 Preparation of the test sample 1 6 Pro
6、cedure 1 7 Test report 1 Publications referred to Inside back coverBS5551-4.3.2:1983 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Chemicals Standards Committee in order to standardize terminology and labelling, sampling and methods of physical a
7、nd chemical testing for fertilizers. For some years the United Kingdom has participated in the standardization of methods of analysing fertilizers through Subcommittee 4, Chemical analysis, of Technical Committee134, Fertilizers and soil conditioners, of the International Organization for Standardiz
8、ation (ISO). As international agreement is reached on the methods, it is proposed to publish them as Sections of BS 5551. The standard is to be published in four Parts, each Part being subdivided into Sections and, where appropriate, Subsections. The four Parts are: Part 1: Terminology and labelling
9、; Part 2: Sampling; Part 3: Physical properties; Part 4: Chemical analysis. Part 4 is to be divided into five Sections as follows: Section 4.1: Determination of nitrogen; Section 4.2: Determination of phosphorous; Section 4.3: Determination of potassium; Section 4.4: Determination of water; Section
10、4.5: Determination of other constituents. This Subsection of Part4 is identical with ISO7407:1983 “Fertilizers Determination of acid-soluble potassium content Preparation of the test solution”. Terminology and conventions. The text of the International Standard has been accepted as suitable for publ
11、ication 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. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Br
12、itish Standard”. The comma has 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. Additional information. 1) This British Standard describes a method of test only and should not be used as a specification defining lim
13、its of purity. Reference to the standard should indicate that the method of test used is in accordance with BS5551-4.3.2. 2) With reference to clause 3, water complying with BS3978 “Water for laboratory use” is suitable. 3) With reference to clause 5 and 6.1, the phrase “pretreatment of test samples
14、” (see clause 5) refers solely to the sampling procedures, such as sample division, used to produce “the prepared test sample” (see 6.1) and has no other significance, e.g. chemical significance. Other International Standards in this series are being prepared describing these sampling procedures and
15、, subject to UK approval, will be published as identical Sections of BS5551-2. Pending publication of these methods, guidance on sampling may be obtained in BS5309 “Methods for sampling chemical products”, Part 1 “Introduction and general principles”, Part3 “Sampling of liquids” and Part 4 “Sampling
16、 of solids”. Cross-reference International Standard Corresponding British Standard ISO 1042:1981 BS 1792:1982 Specification for one-mark volumetric flasks (Identical)BS5551-4.3.2:1983 BSI 12-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of
17、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 front cover, an inside front cover, pages i to iv, pages 1 and 2, an inside back cover and a back
18、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.iv blankBS5551-4.3.2:1983 BSI 12-1999 1 1 Scope and field of application This International Standard specifies the reference me
19、thod for the preparation of test solutions of fertilizers for the subsequent determination of their acid-soluble potassium contents. 2 Principle Boiling of a test portion with dilute hydrochloric acid solution. 3 Reagent Use only reagent of recognized analytical grade and only distilled water or wat
20、er of equivalent purity. 3.1 Hydrochloric acid, solution containing approximately36,5g of HCl per litre. Add 50,0 ml of hydrochloric acid (20= 1,18 g/ml) to about400 ml of water and cool. Dilute the solution with water to 500ml and mix. 4 Apparatus Ordinary laboratory apparatus, and 4.1 Flat-bottome
21、d flask, of capacity 750 ml. 4.2 Reflux condenser 4.3 One-mark volumetric flask, of capacity1000ml, complying with the requirements of ISO1042 1) , class B (maximum permitted error: 0,80ml). 5 Preparation of the test sample Pretreatment of test samples of fertilizers for the determination of potassi
22、um content will form the subject of a future International Standard. 6 Procedure 6.1 Test portion Weigh, to the nearest 0,001 g, 5 g of the prepared test sample (see clause 5). 6.2 Dissolution Transfer the test portion (6.1) to the flask (4.1) with300ml of the hydrochloric acid solution (3.1) and fi
23、t the reflux condenser (4.2) to the flask. Bring to the boil and continue boiling for 30 min. Cool the contents of the flask and transfer to the one-mark volumetric flask (4.3). Dilute to the mark with the hydrochloric acid solution (3.1), mix well and filter into a dry beaker. Discard the first50ml
24、 of filtrate. 7 Test report The test report for the subsequent determination of acid-soluble potassium content shall include the following information relevant to the preparation of the test solution: a) all the information necessary for the complete identification of the sample; b) a reference to t
25、his International Standard; c) any operations not specified in this International Standard, or regarded as optional, as well as any incidents likely to affect the results of the determination of acid-soluble potassium content. 1) ISO 1042, Laboratory glassware One-mark volumetric flasks.2 blankBS555
26、1-4.3.2:1983 BSI 12-1999 Publications referred to See national foreword.BS 5551-4.3.2: 1983 ISO 7407:1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in E
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