欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    BS 3907-13-1972 Methods for the analysis of magnesium and magnesium alloys - Determination of tin in magnesium and magnesium alloys (photometric method)《镁和镁合金分析方法 第13部分 锡含量测定(光度测量法.pdf

    • 资源ID:543976       资源大小:358.90KB        全文页数:8页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    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)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、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。

    BS 3907-13-1972 Methods for the analysis of magnesium and magnesium alloys - Determination of tin in magnesium and magnesium alloys (photometric method)《镁和镁合金分析方法 第13部分 锡含量测定(光度测量法.pdf

    1、BRITISH STANDARD BS3907-13: 1972 Method for The determination of tin in magnesium and magnesium alloys (Photometric method) Methods for the analysis of magnesium and magnesium alloysBS3907-13:1972 This BritishStandard, having been approved by the Non-ferrous Metals Industry Standards Committee, was

    2、published under the authorityofthe Executive Boardon 14September1972 BSI12-1999 The following BSI references relate to the work on this standard: Committee references NFE/23 andNFE/23/4 Draft for comment71/40317 ISBN 0 580 07247 9 Co-operating organizations The Non-ferrous Metals Industry Standards

    3、Committee, under whose supervision this BritishStandard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Aluminium Federation Association of Bronze and Brass Founders British Bronze and Brass Ingot Manufacturers Associat

    4、ion British Lead Manufacturers Association British Non-ferrous Metals Federation British Non-ferrous Metals Federation High Conductivity Copper Group British Non-ferrous Metals Research Association* Copper Development Association Department of Trade and Industry (Marine Division) Electric Cable Make

    5、rs Confederation Institute of British Foundrymen Institute of Metals Institution of Mechanical Engineers (Automobile Division) Institution of Mining and Metallurgy Institution of Production Engineers Institution of Structural Engineers Lead Development Association Light Metal Founders Association Lo

    6、ndon Metal Exchange Magnesium Industry Council* Ministry of Defence (Army)* Ministry of Defence (Navy) National Brassfoundry Association Non-ferrous Metal Stockists* Post Office Royal Institute of British Architects Society of Motor Manufacturers and Traders Ltd.* Tin Research Institute Zinc Develop

    7、ment Association Individual manufacturers The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of thisBritishStandard: Department of Trad

    8、e and Industry Department of Trade and Industry Laboratory of the Government Chemist Institute of Sheet Metal Engineering Individual analysts Amendments issued since publication Amd. No. Date CommentsBS3907-13:1972 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii

    9、 1 Introduction 1 2 Apparatus 1 3 Solutions required 1 4 Sampling 1 5 Procedure 1 6 Calibration 2 7 Notes 2BS3907-13:1972 ii BSI 12-1999 Foreword This standard makes reference to the following BritishStandards: BS1499, Sampling non-ferrous metals. BS3978, Water for laboratory use. This method for th

    10、e photometric determination of tin in magnesium and magnesium alloys is the thirteenth of a series which will form a complete BritishStandard under the collective title “Methods for the analysis of magnesium and magnesium alloys” each being published as a separate part. Other methods in the series a

    11、re as follows: Part1: Aluminium (gravimetric method); Part2: Iron (photometric 1 : 10 phenanthroline method); Part3: Copper (photometric method); Part4: Manganese (photometric periodate method); Part5: Manganese (photometric periodate method) (low contents); Part6: Zirconium (photometric method); Pa

    12、rt7: Nickel (photometric method); Part8: Total rare earths (gravimetric method); Part9: Zinc (ion-exchange-volumetric EDTA method); Part10: Manganese in magnesium alloys containing zirconium, rare earths or thorium (photometric method); Part11: Silicon in magnesium and magnesium alloys; Part12: Alum

    13、inium in magnesium and magnesium alloys (photometricmethod). The preparation of this series of methods has been authorized by the Non-Ferrous Metals Industry Standards Committee as part of a general programme for the standardization of methods for the sampling and analysis of non-ferrous metals. The

    14、 methods have been found to give reliable and reproducible results and while in some instances they may appear to be lengthy, it should be appreciated that they are primarily intended as “referee” methods to be used in cases of dispute. A British Standard does not purport to include all the necessar

    15、y provisions of a contract. Users of 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, pagesi andii, pages1 and

    16、2 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.BS3907-13:1972 BSI 12-1999 1 1 Introduction 1.1 Principle. Tin as the tin-quercetin complex isseparated into isobu

    17、tyl methyl ketone(4-methylpentan2-one) and the determination is completed photometrically. 1.2 Range. The method is recommended for tin contents up to0.08%. 1.3 Reproducibility. Experiments have been carried out independently by a number of analysts using this method. The degree of reproducibility t

    18、hat can be expected is shown by the following analysis of the results obtained. 2 Apparatus 2.1 Class A volumetric glassware complying with theappropriate BritishStandards shall be used throughout. 2.2 Any instrument suitable for measuring the optical density of the solution at a wavelength of440nm

    19、may be used with a1cm cell. Alternatively, when a filter photometer of the balanced two-cell type is used, the following conditions have been found suitable: Mercury vapour lamp; Ilford601 or equivalent filter; 1cm cell. 3 Solutions required All reagents shall be of the highest purity obtainable and

    20、 either distilled or demineralized water complying with BS3978 1)shall be used throughout. Solutions shall be freshly prepared and where necessary filtered. Standard tin (1mlN 0.05mg of tin). Dissolve0.5g of high purity tin by warming with a mixture of10ml of sulphuric acid(50%) and10ml of nitricaci

    21、d(50%). When the sample has dissolved evaporate to fumes of sulphuric acid. Allow to cool, add190ml of sulphuric acid(50%) transfer to a1litre volumetric flask, dilute to the mark and mix. Transfer10ml of this solution to a100ml volumetric flask, dilute to the mark with sulphuric acid(10%) and mix.

    22、Standard tin (1ml N 0.01mg of tin). Transfer20ml of standard tin solution(1mlN 0.05mg of tin) to a100ml volumetric flask, dilute to the mark with sulphuric acid(10%) and mix. Ascorbic acid (2% w/v), Dissolve2g of ascorbic acid in water, dilute to100ml and mix. This solution should be prepared immedi

    23、ately before use. Quercetin (0.1% w/v). Dissolve0.2g of quercetin(3,3,4,5,7 pentahydroxyflavone) in60ml of ethanol(95%), heating gently to dissolve. Cool, add5ml of hydrochloric acid (sp.gr.1.161.18), dilute to200ml with ethanol(95%) and mix. Filter if necessary. Nitric acid (50%v/v). Dilute500ml of

    24、 nitric acid (sp. gr.1.42) to1litre and mix. Sulphuric acid (50%v/v). To400ml of water, add cautiously500ml of sulphuric acid (sp. gr.1.84), mix. Cool, dilute to1litre and mix. Sulphuric acid (10%v/v). To400ml of water, add cautiously100ml of sulphuric acid (sp. gr.1.84), mix. Cool, dilute to1litre

    25、and mix. Sulphuric acid (5% v/v). To400ml of water, add cautiously50ml of sulphuric acid (sp. gr.1.84), mix, cool, dilute to1litre and mix. Thiourea (5%w/v). Dissolve5g of thiourea in90ml of warm water (about60 C). Cool, dilute to100ml and mix. Filter if necessary. This solution should be prepared i

    26、mmediately before use. 4 Sampling Recommended methods of obtaining a suitable sample for the analytical procedure given below are described in BS1499 “Sampling non-ferrous metals”. 5 Procedure 5.1 Proceed as follows. (Note7.1). 5.1.1 For tin contents less than0.008%. Weigh1g of sample and transfer t

    27、o a250ml conical beaker. Add20ml of water then10ml of sulphuric acid(50%). When the reaction has subsided allow to cool. 5.1.2 For tin contents0.008 to0.08%. Weigh1g of sample and transfer to a250ml conical beaker. Add20ml of water then10ml of sulphuric acid(50%). When the reaction has subsided, coo

    28、l, transfer to a250ml volumetric flask, dilute to the mark and mix. Transfer by means of a pipette25ml of this solution to a250ml conical beaker, then add5ml of sulphuric acid(50%). Tin content Standard deviation % 0.005 0.029 0.081 0.00029 0.0023 0.0034 1) BS3978, “Water for laboratory use”.BS3907-

    29、13:1972 2 BSI 12-1999 5.2 Add the following freshly prepared mixture: 5ml of ascorbic acid solution(2%); 20ml of thiourea solution(5%); 20ml of quercetin solution(0.1%). Allow to stand for15minutes then transfer to a separating funnel, washing the beaker with15ml of isobutyl methyl ketone and transf

    30、erring this to the separating funnel. Shake for one minute. Allow the layers to separate and discard the aqueous layer. 5.3 Add25ml of sulphuric acid(5%) to the separating funnel and shake for30seconds, allow the layers to separate and discard the aqueous layer. 5.4 Dry the stem of the separating fu

    31、nnel with filter paper then transfer the organic layer to a25ml volumetric flask. Wash the separating funnel with5ml of ethanol(95%) and add the washings to the flask. Dilute to the mark with ethanol(95%) and mix. 5.5 Measure the optical density of the solution using the conditions specified under A

    32、pparatus using a mixture of equal volumes of ethanol(95%) and isobutyl methyl ketone as the reference solution. 6 Calibration 6.1 Proceed as follows. (Note7.1). 6.1.1 For tin contents less than0.008%. To five250ml conical beakers add the following quantities (Note7.2): 6.1.2 For tin contents0.008 to

    33、0.08%. To four250ml volumetric flasks transfer by means of a pipette the following quantities: (Note7.2) Dilute to the mark and mix. Transfer by means of a pipette25ml of each solution to a series of250ml conical beakers and add the following (Note7.2): 6.2 Continue from paragraph5.2 of the Procedur

    34、e. 6.3 Measure the optical density using the conditions specified under Apparatus and prepare a calibration graph by plotting the optical density against the equivalent percentage of tin. 7 Notes 7.1 The calibration should be carried out at the same time as the test. 7.2 These quantities have been c

    35、hosen so that each solution has a volume of30ml and contains5.0ml of sulphuric acid(50%). Standard tin solution Tin equivalent Sulphuric acid(50%) Water (1mlN 0.01mg of tin) ml 0 2 4 6 8 % 0 0.002 0.004 0.006 0.008 ml 5.0 4.6 4.2 3.8 3.4 ml 25.0 23.4 21.8 20.2 18.6 Standard tin solution Sulphuric ac

    36、id(50%) (1ml N 0.05mg of tin) ml 0 5 10 15 ml 5 5 5 5 Tin equivalent Sulphuric acid(50%) Water % 0 0.025 0.050 0.075 ml 4.5 4.4 4.3 4.2 ml 0.5 0.6 0.7 0.8blankBS3907-13: 1972 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for

    37、preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editi

    38、ons. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the insi

    39、de front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addre

    40、ssed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of i

    41、nformation on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089

    42、967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BS

    43、I publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electr

    44、onic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.


    注意事项

    本文(BS 3907-13-1972 Methods for the analysis of magnesium and magnesium alloys - Determination of tin in magnesium and magnesium alloys (photometric method)《镁和镁合金分析方法 第13部分 锡含量测定(光度测量法.pdf)为本站会员(wealthynice100)主动上传,麦多课文档分享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档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    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 

    收起
    展开