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1、DRAFT FOR DEVELOPMENT DD ENV 1250-2:1995 Wood preservatives Methods of measuring losses of active ingredients and other preservative ingredients from treated timber Part 2: Laboratory method for obtaining samples for analysis to measure losses by leaching into water or synthetic sea water Licensed C
2、opy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 1250-2:1995 This Draft for Development, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the auth
3、ority of the Standards Board and comes into effect on 15 May 1995 BSI 02-2000 The following BSI references relate to the work on this Draft for Development: Committee reference B/515 Draft announced in BSI News, May 1995 ISBN 0 580 23930 6 Committees responsible for this Draft for Development The Un
4、ited Kingdom participation in the preparation of this Draft for Development was entrusted to Technical Committee B/515, Wood preservation, upon which the following bodies were represented: British Wood Preserving and Damp-proofing Association Chemical Industries Association Creosote Council Departme
5、nt of the Environment (Building Research Establishment) Electricity Industry in United Kingdom Institute of Wood Science National House-building Council Timber Research and Development Association Timber Trade Federation The following bodies were also represented in the drafting of the prestandard,
6、through subcommittees and panels: Association of Consulting Scientists Imperial College of Science and Technology Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy,
7、 (c) BSI DD ENV 1250-2:1995 BSI 02-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of ENV 1250-23 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontr
8、olled Copy, (c) BSI DD ENV 1250-2:1995 ii BSI 02-2000 National foreword This Part of DD ENV 1250 has been prepared by Technical Committee B/515 and is the English language version of ENV 1250-2:1994 Wood preservatives Methods for measuring losses of active ingredients and other preservative ingredie
9、nts from treated timber Part 2: Laboratory method for obtaining samples for analysis to measure losses by leaching into water or synthetic sea water, published by the European Committee for Standardization (CEN). ENV 1250-2 was produced as a result of international discussion in which the United Kin
10、gdom participated. DD ENV 1250 consists of the following Parts: Part 1: Laboratory method for obtaining samples for analysis to measure losses by evaporation to air; Part 2: Laboratory method for obtaining samples for analysis to measure losses by leaching into water or synthetic sea water. The proc
11、edures described in this Draft for Development are intended to be carried out by appropriately qualified and experienced persons or other suitably trained and/or supervised personnel. Normal safety precautions should be used throughout the use of the methods. This publication is not to be regarded a
12、s a British Standard It is being issued in the Draft for Development series of publications and is of a provisional nature because there is at present insufficient experience in the use of the test method. It should be applied on this provisional basis, so that information and experience of its prac
13、tical application may be obtained and reported to the responsible CEN Technical Committee. Users of this Draft for Development are invited to comment on its technical content, ease of use and any ambiguities or anomalies. These comments will be taken into account when preparing the UK national respo
14、nse to CEN on the question of whether the ENV can be converted to an EN. Comments should be sent in writing to the Secretary of BSI Technical Committee B/515 at BSI, 389 Chiswick High Road, London, W4 4AL, quoting this Draft for Development, the relevant clause number and a proposed revision, within
15、 2 years of the issue of this Draft for Development. Cross-references Publication referred toCorresponding British Standard ISO 3696:1987BS 3978:1987 Specification for water for laboratory use EN 335-1:1992BS EN 335-1 Hazard classes of wood and wood based products against biological attack Part 1:19
16、92 Classification of hazard classes Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ENV title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Th
17、is will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 1250-2 December 1994 ICS 71.1
18、00.50 Descriptors: Wood, wood preservatives, prevention, measurements, losses, chemical compounds, water, sea water, laboratory tests, samples, procedure English Version Wood preservatives Methods for measuring losses of active ingredients and other preservative ingredients from treated timber Part
19、2: Laboratory method for obtaining samples for analysis to measure losses by leaching into water or synthetic sea water Produits de prservation du bois Mesurage des pertes de matires actives et dautres composants du produit de prservation partir de bois trait Partie 2: Mthode de laboratoire pour obt
20、enir des chantillons pour analyse pour mesurer les pertes aprs dlavage leau ou leau de mer synthtique Holzschutzmittel Verfahren zur Bestimmung der Abgabe von Wirkstoffen und anderer Schutzmittelbestandteile aus behandeltem Holz Teil 2: Laboratoriumsverfahren, um Analysenproben zur Bestimmung der Ab
21、gabe durch Auswaschung in Wasser oder knstilichem Meerwasser zu erhalten This European Prestandard (ENV) was approved by CEN on 1994-09-28 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three years. After two years the members of CEN
22、 will be requested to submit their comments, particularly on the question whether the ENV can be converted into an European Standard (EN). CEN members are required to announce the existance of this ENV in the same way as for and EN and to make the ENV available promptly at national level in an appro
23、priate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greec
24、e, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reser
25、ved to CEN members Ref. No. ENV 1250-2:1994 E Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1250-2:1994 2 BSI 02-2000 Foreword This European Prestandard was drawn up by the WG 11, Fixation of biocides, of
26、 CEN/TC 38, Durability of wood and wood based products, the secretariat of which is held by AFNOR. In accordance with the CEN/CENELEC Internal Regulations the following countries are bound to announce this European Prestandard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ir
27、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions3 4Principle3 5Agents and equipment4 6Apparatus and equipment4 7Identity and sampling of preservative product4 8Test s
28、pecimens5 9Procedure5 10Information to accompany the samples to be analysed7 Annex A (informative) Bibliography8 Figure 18 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1250-2:1994 BSI 02-20003 Introducti
29、on This part of ENV 1250 describes a procedure for obtaining samples for analysis to measure losses by leaching in water or synthetic sea water of active ingredients and other preservative ingredients from test specimens of wood that have previously been treated with a preservative. It is intended t
30、hat the results of analysis will enable the rate of loss of active ingredients and other ingredients of a wood preservative from treated timber under controlled conditions to be established. It is not intended that the results of analysis be used to make absolute judgements of losses of wood preserv
31、ative ingredients from treated timber in service since the results cannot be related to in-service exposure conditions of wooden components. The methodology is therefore of interest, for example, as part of the development of preservatives. The results are relevant to the preservative only, not to a
32、 combination of preservative and method of application. NOTEEN 84 describes another method involving leaching of treated timber but is not related to this part of ENV 1250. EN 84 is used solely as an accelerated ageing procedure prior to biological testing for efficacy assessment. 1 Scope This part
33、of ENV 1250 describes a procedure for obtaining samples for analysis to measure losses by leaching in water or synthetic sea water of active ingredients and other preservative ingredients from test specimens of wood that have previously been treated with a preservative. 2 Normative references This p
34、art of ENV 1250 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 publicatio
35、ns apply to this part of ENV 1250 only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 599-1:1994, Durability of wood and wood-based products Performance of wood preservatives as determined by biological tests Par
36、t 1: Specifications according to hazard class1). ISO 3696:1987, Water for analytical laboratory use Specification and test methods. 3 Definitions For the purposes of this part of ENV 1250 the following definitions apply: 3.1 active ingredients the individual chemical compound or compounds included i
37、n the wood preservative product to give it specific activity against the respective biological agencies of deterioration 3.2 critical value value equivalent to the highest biological reference value (in grams per square metre or kilograms per cubic metre) obtained from all the biological tests carri
38、ed out in accordance with EN 599-1 for any given hazard class. It is the minimum amount of the product required for effectiveness for that hazard class according to the tests carried out NOTEThe biological reference is the amount of wood preservative product found to be effective in preventing attac
39、k by particular biological agency in a test prescribed in EN 599-1. 3.3 leachate the sample of water collected for analysis from the test vessel at the end of each period of immersion 3.4 other preservative ingredients substance or substances, other than active ingredients, used in the wood preserva
40、tive formulation and which may be deposited in treated wood 3.5 representative sample a sample having its physical or chemical characteristics identical to the volumetric average characteristics of the total volume being sampled 3.6 supplier the sponsor of the test 4 Principle End-sealed preservativ
41、e-treated and untreated timber test specimens are prepared, and subjected to six leaching periods with either water or synthetic sea water. The leachate from each of the six periods is collected for analysis. 1) En course of preparation Licensed Copy: London South Bank University, London South Bank
42、University, Tue Dec 12 05:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1250-2:1994 4 BSI 02-2000 5 Agents and materials 5.1 Water complying with grade 3 of ISO 3696 5.2 Synthetic sea water. The reagents used shall be of recognized analytical quality. The composition of the synthetic sea wate
43、r shall be as follows: 5.3 End-sealant. A substance which, when applied in accordance with the procedures in 9.1.5, prevents penetration of water into, and loss of preservative from the end grain of test specimens under the conditions of the test. It shall be free of any substances present in the pr
44、eservative or which may interfere with analytical methods. NOTE2-component epoxylacquers have been found to be suitable. 6 Apparatus and equipment 6.1 Conditioning chamber, well ventilated and controlled at a temperature of (20 2) C and (65 5) % relative humidity for conditioning the test specimens.
45、 6.2 Vacuum desiccator, fitted with stopcocks 6.3 Vacuum pump fitted with a pressure gauge and capable of maintaining a pressure of 0,7 kPa. 6.4 Weights, of a material that does not react with the preservative solutions under test, to provide ballast for the test specimens. 6.5 Treatment vessels and
46、 covers, of materials that do not react with the preservative under test. 6.6 Water baths, capable of being controlled at (20 2) C in which test vessels (6.7) are placed. NOTELarge beakers containing water have been found suitable. It is most convenient if the magnetic stirrer (6.8) incorporates a h
47、ot-plate when this can be used to maintain the temperature. 6.7 Test vessels and close fitting lids of material that does not react with the preservative under test. NOTE 1Beakers have been found suitable, made of either glass, especially for the organic solvent products, or plastics materials for p
48、roducts that are likely to attack glass have been found suitable. The capacity of the test vessels shall be such that they can contain, in addition to the test specimens, the volume of water specified in 9.3. NOTE 2Vessels 170 mm high and 90 mm diameter have been found suitable. 6.8 Magnetic stirrer
49、, follower and framework (see Figure 1), of materials that do not react with the preservative under test. The framework to be placed inside the test vessels (6.7) to keep the test specimens (see clause 8) out of contact with, and allow free movement of the follower. 6.9 Ballasting device to keep test specimens submerged NOTEA plastic grid has been found to be suitable. 6.10 Vessels, of material that does not react with the preservative under test, to hold leachate for subsequent analysis. 6.11 Ordinary laboratory eq