ImageVerifierCode 换一换
格式:PDF , 页数:18 ,大小:657.61KB ,
资源ID:585955      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-585955.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(BS ISO 1952-2008 Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid《固体矿物燃料 稀释盐酸中可萃取金属的测定》.pdf)为本站会员(李朗)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

BS ISO 1952-2008 Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid《固体矿物燃料 稀释盐酸中可萃取金属的测定》.pdf

1、BS ISO 1952:2008ICS 73.040; 75.160.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDSolid mineral fuels Determination ofextractable metals indilute hydrochloricacidThis British Standardwas published underthe authority of theStandards Policy andStrategy Committe

2、e on 30September 2008 BSI 2008ISBN 978 0 580 57040 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 1952:2008National forewordThis British Standard is the UK implementation of ISO 1952:2008.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mi

3、neral fuels.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immu

4、nityfrom legal obligations.BS ISO 1952:2008Reference numberISO 1952:2008(E)ISO 2008INTERNATIONAL STANDARD ISO1952Second edition2008-09-01Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid Combustibles minraux solides Dtermination des mtaux extractibles dans lacide ch

5、lorhydrique dilu BS ISO 1952:2008ISO 1952:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer

6、performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create th

7、is PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Cent

8、ral Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission

9、 in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS

10、 ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents and materials . 1 5 Apparatus 4 6 Preparation of the test sample 4 7 Procedure 4 8 Expression of results . 5 9 Precision 6 10 Test

11、report . 6 BS ISO 1952:2008ISO 1952:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO t

12、echnical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates clos

13、ely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draf

14、t International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this docum

15、ent may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1952 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5, Methods of analysis. This second edition cancels and replaces the first edition (I

16、SO 1952:1976), which has been technically revised. BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved vIntroduction Sodium, potassium, calcium, iron and magnesium are commonly present in solid mineral fuel. They can contribute significantly to coal-utilization problems, such as boiler-tub

17、e fouling and ash disposal; they also affect product quality and gaseous emissions from combustion processes. Research indicates that the amounts of alkaline and earth-alkaline metals extractable with dilute hydrochloric acid are more closely related to the fouling/slagging properties of solid miner

18、al fuel than are the total amounts of the metals. BS ISO 1952:2008BS ISO 1952:2008INTERNATIONAL STANDARD ISO 1952:2008(E) ISO 2008 All rights reserved 1Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid 1 Scope This International Standard describes the extraction fro

19、m solid mineral fuels by dilute hydrochloric acid and determination of extractable sodium, potassium, calcium, iron and magnesium. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F

20、or undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use Specification and test methods ISO 5068-2, Brown coals and lignites Determination of moisture content Part 2: Indirect gravimetric method for moistur

21、e in the analysis sample ISO 5069-2, Brown coals and lignites Principles of sampling Part 2: Sample preparation for determination of moisture content and for general analysis ISO 5725-6:1994, Accuracy (trueness and precision) of measurement methods and results Part 6: Use in practice of accuracy val

22、ues ISO 11722, Solid mineral fuels Hard coal Determination of moisture in the general analysis test sample by drying in nitrogen ISO 13909-4, Hard coal and coke Mechanical sampling Part 4: Coal Preparation of test samples 3 Principle A portion of the sample is extracted with hot, dilute hydrochloric

23、 acid after wetting of the solid mineral fuel with alcohol. All forms of sodium, potassium, magnesium, calcium, iron that are exchangeable or extractable with the hydrochloric acid are extracted from the coal. After removal of the residual solid mineral fuel by filtration, the concentrations of the

24、elements in the filtrate are determined by atomic absorption spectrometry. The concentrations of the elements may also be determined by ICP-OES if the instrument has been validated for the quantification in an appropriate manner. 4 Reagents and materials Use analytical reagent grade chemicals. Other

25、 grades can be used, provided it is documented that the reagent is of sufficiently high purity to permit its use without adversely affecting the accuracy of the determination. BS ISO 1952:2008ISO 1952:2008(E) 2 ISO 2008 All rights reserved4.1 Water, high-purity deionized water as defined in ISO 3696

26、, or as defined by the equivalent national standard. 4.2 Ethanol. 4.3 Hydrochloric acid (HCl). 4.4 Hydrochloric acid, concentrated, 20= 1,19 g/ml. 4.5 Hydrochloric acid solution, prepared by mixing 1 part concentrated hydrochloric acid (4.4) with 1 part deionized water (4.1). DANGER The addition of

27、the strong acid, HCl, to water liberates a significant amount of heat and can cause a violent reaction. 4.6 Nitric acid (HNO3), concentrated, 20= 1,42 g/ml. 4.7 Lanthanum oxide (La2O3). 4.8 Lanthanum solution. Dissolve 23,4 g of La2O3(4.7) in 350 mL of deionized water (4.1). Slowly add 50 mL of conc

28、entrated nitric acid. Stir until solution is completely mixed, transfer to a 1 l volumetric flask, dilute to the mark with water. DANGER The addition of the strong acid, HNO3, to water liberates a significant amount of heat and can cause a violent reaction. NOTE The lanthanum solution is used as an

29、ionization suppressant during calcium determination. It is possible to use other commonly used ionization suppressants, e.g. cesium, as a alternative. 4.9 Magnesium perchlorate, anhydrous, 2,0 mm +0,7 mm, used as a desiccant. DANGER Regeneration of magnesium perchlorate by oven drying should not be

30、attempted because of the risk of explosion. Magnesium perchlorate is a strong oxidant, and should be kept away from organic materials such as oils, greases and organic solvents. 4.10 Stock solutions 4.10.1 Sodium chloride (NaCl). 4.10.2 Sodium solution, 1 000 mg/L. Dissolve 2,542 g of sodium chlorid

31、e (4.10.1) (previously dried at 110 C for 1 h) in 200 mL of deionized water (4.1), stir until solution is completely mixed, transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.3 Potassium chloride (KCl). 4.10.4 Potassium solution, 1 000 mg/L. Dissolve 1,907 g of potassium chlorid

32、e (4.10.3) (previously dried at 110 C for 1 h) in 200 ml of water (4.1), transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.5 Calcium carbonate (CaCO3). 4.10.6 Calcium carbonate solution, 1 000 mg/L. Dissolve 2,497 g of calcium carbonate (4.10.5) (previously dried at 110 C for 1

33、 h) in a solution containing 10 ml of concentrated hydrochloric acid (4.4) and 200 ml of deionized water (4.1), stir until solution is BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved 3completely mixed. Bring to a gentle boil to remove excess carbon dioxide. Cool the solution, transfer

34、to a 1 l volumetric flask, dilute to the mark with water. 4.10.7 Magnesium oxide. 4.10.8 Magnesium solution, 1 000 mg/L. Place 1,658 g of magnesium oxide (4.10.7) (previously heated at 1 000 C for 1 h) in solution containing 10 ml of concentrated hydrochloric acid (4.4) and 200 ml of deionized water

35、 (4.1), stir until solution is completely mixed. Warm until dissolved, cool, transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.9 Iron, minimum purity 99,8 % Fe. 4.10.10 Iron solution, 1 000 mg/L. Place 1,000 g of pure iron (4.10.9) in a solution containing 20 ml of concentrated

36、 hydrochloric acid (4.4) and 20 ml of deionized water (4.1), stir until solution is completely mixed. Heat to boiling and gently simmer until dissolved. Cool, transfer to a 1 l volumetric flask, dilute to the mark with deionized water. 4.10.11 Commercial stock solutions, optional, certified stock so

37、lutions with a concentration of the ion of interest of 1 000 mg/l that can be used as an alternative to preparing stock solutions. 4.11 Calibration solutions, prepared with the volumes of reagents given in Table 1. Prepare calibration solution A, by adding 40 ml of lanthanum solution (4.8) and 32 ml

38、 of hydrochloric acid solution (4.5) to a 1 l volumetric flask. Add 1 ml of each stock solution and stir until the solution is completely mixed. Dilute to the mark with water. Prepare calibration solutions B, C, D, E and the calibration BLANK in the same way as calibration solution A using the volum

39、es of each stock solution shown in Table 1. Additional calibration solutions within the range of those described here may be prepared in the same manner, in order to increase the number of points on the calibration graph. This can be necessary because of the wide ranges of analyte concentrations lik

40、ely to be encountered, and also because of the variations in spectrometer responses. The calibration solutions should be stored in screw-top polyethylene bottles. They should be discarded after three months. Table 1 Volumes of reagents for calibration solutions Calibration solution Concentration of

41、calibration solution mg/l Volume of stock solution ml Volume of lanthanum solution ml Volume of hydrochloric acid solution ml A 1 1 40 32 B 2 2 40 32 C 3 3 40 32 D 4 4 40 32 E 5 5 40 32 BLANK 0 0 40 32 4.12 Filter paper, medium-textured filter paper. BS ISO 1952:2008ISO 1952:2008(E) 4 ISO 2008 All r

42、ights reserved5 Apparatus 5.1 Dispensers for reagents, with the following capacities: 5.1.1 for ethanol 5 ml, graduated. 5.1.2 for hydrochloric acid 10 ml, graduated to fit on top of the hydrochloric acid container. 5.1.3 for lanthanum solution 10 ml. 5.2 Hotplate. 5.3 Atomic absorption spectrometer

43、. 5.4 Desiccator, with desiccant. 5.5 Plastic bottles, polyethylene or polypropylene with screw caps, giving an airtight seal, for storage of all solutions. Condition the bottles before use, by filling with nitric acid (4.6) diluted 1 + 9. Allow to stand for at least 48 h. Rinse the bottles thorough

44、ly with water. 5.6 Glassware, 250 ml beaker and 250 ml volumetric flask. 6 Preparation of the test sample The sample shall be the general test sample prepared in accordance with ISO 13909-4 or ISO 5069-2. 7 Procedure 7.1 Preparation of test portion Weigh approximately 1,5 g of the test sample to the

45、 nearest 2 mg into a 250 mL glass beaker. Concurrently, determine moisture in accordance with ISO 5068-2 or ISO 11722. 7.2 Preparation of test solution Add 4 ml of ethanol to a glass beaker. Make a paste of the solid mineral fuel, stirring with a glass rod until the sample is thoroughly wetted. Do n

46、ot remove the stirring rod. Add 50 ml of deionized water to the beaker. Add 8 ml of the hydrochloric acid solution (4.5) to the beaker. Bring the solution to a boil. Heat at just below boiling for 15 min on a hotplate. Cover with a watch glass. Heat at just below boiling for a further 45 min. Care s

47、hould be taken to maintain the volume in the beaker at approximately 50 ml with deionized water throughout the digestion. Cool, without swirling. NOTE This procedure ensures that all of the ethanol is removed. Filter the sample by decantation into a 250 ml volumetric flask through a filter paper. Ri

48、nse the beaker and stirring rod with hot hydrochloric acid solution, taking care to transfer all the contents onto the filter paper. Rinse the filter paper three times with about 20 ml portions of hot, hydrochloric acid solution. Cool the flask, then add 10 ml of lanthanum solution to the flask. Mak

49、e the flask up to volume with deionized water and mix thoroughly. A blank test solution, which contains all the analytical reagents present in the test solution, shall be prepared by the same procedure as the test solution. BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved 57.3 Analysis of test solutions The atomic absorption spectrometer shall be prepared for operation in accordance with the manufacturers instructions. Recommended gases and wavelengths are given in Table 2. Table 2 Re

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1