1、BRITISH STANDARD BS 5551-4.2.1: 1978 ISO 5316:1977 Fertilizers Part 4: Chemical analysis Section 4.2 Determination of phosphorus Subsection 4.2.1: Extraction of water-soluble phosphates ISO title: Fertilizers Extraction of water-soluble phosphates UDC 631.8:543.06:543.847BS5551-4.2.1:1978 This Briti
2、sh Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Executive Boardon 31January1978 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/37 Draft for comment 76/51155 DC ISB
3、N 0 580 09979 2 Cooperating organizations The Chemicals Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Fatty Acid Distillers British Tar I
4、ndustry Association Chemical Industries Association* Chemical Society, Analytical Division Department of Health and Social Security Department of Industry, Chemicals and Textiles Division Department of Industry, Laboratory of the Government Chemist* Fertiliser Manufacturers Association Ltd.* Hydroca
5、rbon Solvents Association Institution of Gas Engineers Ministry of Agriculture, Fisheries and Food* Ministry of Defence National Sulphuric Acid Association Paintmakers Association of Great Britain Ltd. Royal Institute of Public Health and Hygiene Soap and Detergent Industry Association Standardizati
6、on of Tar Products Tests Committee The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Agrochemicals Association Institute of Trading Standards Administra
7、tion Amendments issued since publication Amd. No. Date of issue CommentsBS5551-4.2.1:1978 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope and field of application 1 2 Reference 1 3 Principle 1 4 Reagent 1 5 Apparatus 1 6 Sampling 1 7 Procedure 1
8、Publications referred to Inside back coverBS5551-4.2.1:1978 ii BSI 10-1999 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 and chemical testing for f
9、ertilizers. For some years the United Kingdom has participated in the standardization of methods of analysing fertilizers through Subcommittee4, Chemical analysis, of Technical Committee134, Fertilizers and soil conditioners, of the International Organization for Standardization (ISO). As internatio
10、nal agreement is reached on the methods, it is proposed to publish them as Sections of BS5551. The standard is to be published in4 Parts, each Part being subdivided into Sections and, where appropriate, Subsections. The four main Parts are: Part 1: Terminology and labelling; Part 2: Sampling; Part 3
11、: 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 phosphorus; Section 4.3: Determination of potassium; Section 4.4: Determination of water; Section 4.5: Determination of other
12、 constituents. This Subsection of Part4 is identical with ISO5316 “Fertilizers Extraction of water-soluble phosphates”. Terminology and conventions. The text of the International Standard has been accepted as suitable for publication, without deviation, as a British Standard. Certain terminology and
13、 conventions are used, however, that are not identical with those used in British Standards. Attention is therefore drawn to the following. Where the words “International Standard”, relating to this publication, appear, they should be interpreted as “British Standard”. The comma has been used as a d
14、ecimal marker. In British Standards it is current practice to use a full point (a full stop on the baseline) as the decimal marker. Cross references. For the following reference to another International Standard that is given in the text, there is an equivalent British Standard; this is given below.
15、 Additional information. With reference to clause4, water complying with the requirements of BS 3978 is suitable. A British 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 Bri
16、tish Standard does not of itself confer immunity from legal obligations. Reference to International Standard Equivalent British Standard ISO Sampling aFertilizers BS 5551-2.1 Principles of sampling a a In course of preparation. Summary of pages This document comprises a front cover, an inside front
17、cover, pages i and ii, pages 1 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.BS5551-4.2.1:1978 BSI 10-1999 1 1 Scope and field of appl
18、ication This International Standard specifies a method for the extraction of water-soluble phosphorus(V) oxide from fertilizers. It is applicable to all fertilizers for which the determination of water-soluble phosphorus(V) oxide content is required. 2 Reference ISO . . ., Fertilizers Sampling 1) .
19、3 Principle Dissolution in water of the phosphorus(V) oxide in a test portion by shaking, using a rotary shaker under specified conditions. 4 Reagent Distilled water, or deionized water of equivalent purity. 5 Apparatus Ordinary laboratory apparatus and in particular 5.1 Wide-necked one-mark volumet
20、ric flask (for example Stohmann flask), of capacity500ml. 5.2 Rotary shaker, capable of being controlled at a rotational frequency of35to40min 1 . 6 Sampling See ISO . . . 7 Procedure 7.1 Test portion Weigh, to the nearest0,001g, about5g of the laboratory sample and place in the volumetric flask(5.1
21、). 7.2 Extraction Add400ml of the water (clause4) at between20and25 C. Shake gently by hand to disperse particulate matter and to prevent the test portion sticking to the sides of the flask. Place the flask on the shaker (5.2), controlled at35to40min 1 , and shake for30min. Dilute to the mark with t
22、he water, mix carefully by hand shaking, and filter through a dry folded filter paper of medium speed, free from phosphate, collecting the filtrate in a dry receiver clean and free from phosphate. Reject the first50ml of filtrate. 1) In preparation.2 blankBS5551-4.2.1:1978 BSI 10-1999 Publications r
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