BS 4325-1-1978 Methods for analysis of oilseed residues - Determination of moisture and volatile matter content《油料种子残留物分析方法 第1部分 水分及挥发物含量测定》.pdf

1、BRITISH STANDARD BS 4325-1: 1978 Methods for Analysis of oilseed residues Part 1: Determination of moisture and volatile matter content UDC 633.85:665.3.002.68:543.81BS4325-1:1978 This British Standard, having been prepared under the directionof the Oil and Fats Standards Committee, was published un

2、der the authority ofthe Executive Board on 29 December1978 BSI 10-1999 First published July 1968 First revision December 1978 The following BSI references relate to the work on this standard: Committee reference OFC/24 Draft for approval 78/50358 ISBN 0 580 10471 0 Cooperating organizations The Oils

3、 and Fats Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Chemical Industries Association Chemical Society, Analytical Division* Department of Industry, La

4、boratory of the Government Chemist* Greater London Council Lard Association Margarine and Shortening Manufacturers Association* Overseas Development Administration Tropical Products Institute* Royal Institute of Public Health and Hygiene Seed Crushers and Oil Processors Association* Soap and Deterge

5、nt Industry Association* United Kingdom Renderers Association Ltd. 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: Association of Fatty Acid Distillers Britis

6、h Food Manufacturing Industries Research Association British Resin Manufacturers Association Co-operative Wholesale Society Ltd. Federation of Gelatine and Glue Manufacturers Limited Federation of Oils, Seeds and Fats Association Ltd. Ministry of Agriculture Fisheries and Food National Linseed Oil P

7、rocessors Association Oil and Colour Chemists Association Rubber Growers Association Society of Chemical Industry United Kingdom Glycerine Producers Association Amendments issued since publication Amd. No. Date of issue CommentsBS4325-1:1978 BSI 10-1999 i Contents Page Cooperating organizations Insi

8、de front cover Foreword ii 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Principle 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 2 8 Notes on procedure 2 9 Test report 2BS4325-1:1978 ii BSI 10-1999 Foreword This Part of BS4325, which was prepared under the direction of t

9、he Oils and Fats Standards Committee, constitutes the first revision of BS4325-1:1968. It is identical with ISO771 “Oilseed residues Determination of moisture and volatile matter content”, except for changes in clauses1, 2, 6.1.1, and 9. In clauses1 and9 the words “International Standard” have been

10、deleted and replaced by “British Standard”. Clause2 and the sampling instructions given in6.1.1 have been altered because the ISO text refers to a sampling standard which is not yet available. The text of the International Standard has been used as the basis of this British Standard; therefore certa

11、in conventions are not identical with those normally used in British Standards; attention is especially drawn to the following. 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. Important note. Attentio

12、n is drawn to Statutory Instrument1973 No1521 (Agriculture. The Fertilisers and Feeding Stuffs Regulations1973) and to Statutory Instrument1976 No840 (Agriculture. The Fertilisers and Feeding Stuffs (Amendment) Regulations 1976), which control the sale of oilseed residues and compound cakes or meals

13、 intended for animal feeding purposes in the UnitedKingdom and prescribe methods for determining specified analytical characteristics. Where differences exist between these methods and those given in this British Standard the latter may be used only for purposes which do not fall within the scope of

14、 the Statutory Instruments. Additional information. A sieve complying with the requirements of BS410 “Specification for test sieves” will satisfy the requirement in5.3. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsib

15、le 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, pagesi andii, pages1 and2 and a back cover. This standard has been updated (see copyright dat

16、e) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4325-1:1978 BSI 10-1999 1 NOTEThose parts of the text which differ from ISO 771 are indicated by a vertical line in the margin. Otherwise this standard is identical with ISO771. 1 S

17、cope and field of application This British Standard specifies a method for the determination of the moisture and volatile matter content of residues (excluding compounded products) obtained by the extraction of oil from oilseeds by pressure or solvent. 2 References NOTEAn International Standard, ISO

18、5500 “Oilseed residues Sampling”, is in course of preparation. It is intended to publish a British Standard dealing with sampling of oilseed residues at a later date. Until such time, preparation of the contract sample should be in accordance with6.1.1. 3 Definition moisture and volatile matter cont

19、ent the loss in mass measured under the operating conditions specified below the moisture and volatile matter content is expressed as a percentage by mass 4 Principle Drying of a test portion at103 2 C in an oven at atmospheric pressure, until practically constant mass is reached. 5 Apparatus 5.1 An

20、alytical balance 5.2 Mechanical mill, easy to clean and allowing the residues to be ground, without heating and without appreciable change in the moisture, volatile matter and oil content, to particles passing completely through the sieve (5.3). 5.3 Sieve, with apertures of diameter1mm. 5.4 Flat-bot

21、tomed vessel, of metal resistant to attack under the test conditions, provided with a well fitting lid and allowing the test portion to be spread to about 0,2 g/cm 2(for example diameter of vessel 50 to 70 mm, height about 30 mm). Glass vessels with ground closures may also be used. 5.5 Electric ove

22、n, with thermostatic control and good natural ventilation, capable of being regulated so that the temperature of the air and of the shelves in the neighbourhood of the test portions lies between101 and 105 C in normal operation. 5.6 Desiccator, containing an efficient desiccant and provided with a m

23、etal plate which allows vessels(5.4) to cool rapidly. 6 Procedure Make all weighings to the nearest0,001g. 6.1 Preparation of the test sample 6.1.1 It is essential to ensure that the contract sample is fully representative of the material under test. (See also note to clause2.) 6.1.2 Grind the contr

24、act sample, if necessary, in the previously well cleaned mechanical mill (5.2). First, use about one-twentieth of the sample to complete the cleaning of the mill, and reject these grindings; then grind the rest, collect the grindings, mix carefully and carry out the analysis without delay. 6.2 Test

25、portion 6.2.1 Weigh the vessel (5.4) with its lid, after leaving it open for at least 30 min in the desiccator(5.6) to laboratory temperature. 6.2.2 Weigh into the vessel about5g of the test sample (6.1.2), spread this uniformly over the whole base of the vessel, close the vessel with its lid and re

26、-weigh. Carry out these operations as quickly as possible, in order to avoid any appreciable change in moisture content. 6.3 Determination Place the vessel containing the test portion in the oven (5.5), which has previously been set to operate at 103 2 C, and take off the lid (8.1). After 2 h, recko

27、ned from the time when the temperature returns to 103 2 C, and take off the lid (8.1). Close the oven. After 2 h, reckoned from the time when the temperature returns to 103 C, open the oven, replace the lid on the vessel before removal from the oven and transfer to the desiccator. As soon as the ves

28、sel has cooled to laboratory temperature, weigh it. Return the vessel, with the lid removed, to the oven. After 1 h, repeat the operations of closing the vessel, allowing to cool, and weighing. If the difference between the two weighings is equal to or less than 0,005g, regard the determination as f

29、inished. If not, subject the portion to successive 1 h periods in the oven, until the difference between two successive weighings is equal to or less than0,005g (see 8.2 and 8.3). Carry out two determinations on the same test sample.BS4325-1:1978 2 BSI 10-1999 7 Expression of results 7.1 Method of c

30、alculation and formula The moisture and volatile matter content, U as a percentage by mass of the sample, is given by the formula where Take as the result the arithmetic mean of the two determinations, provided that the requirement concerning repeatability (see7.2) is satisfied. Otherwise, repeat th

31、e determination on two other test portions. If this time the difference again exceeds0,2g per100g of sample, take as the result the arithmetic mean of the four determinations carried out, provided that the maximum difference between the individual results does not exceed0,5g per100g of sample. Expre

32、ss the result to one decimal place. 7.2 Repeatability The difference between the results of two determinations carried out simultaneously or in rapid succession by the same analyst should not exceed0,2g of moisture and volatile matter per100g of sample. 8 Notes on procedure 8.1 If several vessels ar

33、e in the oven together, arrange them in such a way that air can circulate freely between them. 8.2 During the drying, do not add other test portions. 8.3 For test oilseed residues, a single 4 h period in the oven at 103 2 C gives equivalent results, but it is the responsibility of the analyst to con

34、firm this in each particular case. 9 Test report The test report shall show the method used and the result obtained. It shall also mention any operating conditions not specified in this British Standard, or regarded as optional, as well as any circumstances that may have influenced the result. The r

35、eport shall include all details required for complete identification of the sample. m 0 is the mass, in grams, of the vessel; m 1 is the mass, in grams, of the vessel and test portion before drying; m 2 is the mass, in grams, of the vessel and test portion after drying. U m 1 m 2 m 1 m 0 -100 =3 bla

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