ImageVerifierCode 换一换
格式:PDF , 页数:10 ,大小:113.87KB ,
资源ID:181258      下载积分:11 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
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   
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【https://www.wnwk.com/docdown/181258.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: QQ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(ASTM_D_2667_-_95_2008.pdf)为本站会员(益****师)主动上传,蜗牛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,请立即通知蜗牛文库(发送邮件至admin@wnwk.com或直接QQ联系客服),我们立即给予删除!

ASTM_D_2667_-_95_2008.pdf

1、Designation:D266795(Reapproved 2008)Standard Test Method forBiodegradability of Alkylbenzene Sulfonates1This standard is issued under the fixed designation D2667;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi

2、on.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method2covers the determination of the degr

3、eeof biodegradability of alkylbenzene sulfonates.It serves as anindex of the suitability of the sulfonate for general use as asurfactant.1.2 In general,this test method distinguishes between sul-fonates in which the alkyl side chains are linear and those inwhich they are branched,since the former ar

4、e more readilybiodegradable.If the alkylbenzene sulfonate in fully formu-lated products is to be examined,it must be extracted using themethod noted in Annex A1.(See Appendix X1 for data.)1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is the

5、responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Material SafetyData Sheets are available for reagents and materials.Reviewthem for hazards prior to usage.2.Referenced Documents2.

6、1 ASTM Standards:3E1298 Guide for Determination of Purity,Impurities,andContaminants in Biological Drug ProductsD2330 Test Method for Methylene Blue Active Substances(Withdrawn 2011)4E1625 Test Method for Determining Biodegradability ofOrganic Chemicals in Semi-Continuous Activated Sludge(SCAS)3.Sum

7、mary of Test Method3.1 The sample is first subjected to a presumptive test basedon shake culture.When necessary,the sample may be sub-jected to a confirming test based on semicontinuous treatmentwith activated sludge.3.2 In the presumptive test,microorganisms are inoculatedinto a flask that contains

8、 a chemically defined microbial growthmedium(basal medium)and the surfactant to be tested.Aeration is accomplished by continuous shaking of the flask.Following two adaptive transfers,biodegradation is determinedby measuring the reduction in surfactant content during the testperiod.3.3 In the confirm

9、ing test,activated sludge obtained from asewage treatment plant is used.The sludge,the surfactant to betested,and a synthetic sewage used as an energy source for thesludge microorganisms are all placed in a specially designedaeration chamber.The mixture is aerated for 23 h,allowed tosettle,and the s

10、upernatant material removed.The sludgeremaining in the aeration chamber is then brought back tovolume with fresh surfactant and synthetic sewage and thecycle repeated.Biodegradation is determined by the reductionin surfactant content during each cycle.4.Significance and Use4.1 This test method is de

11、signed to determine whether thesulfonate tested will be removed sufficiently by usual methodsof sewage treatment for the effluent to be safely discharged tothe environment without further treatment.4.2 If the surfactant reduction in the presumptive test equalsor exceeds 90%,the material is considere

12、d to be adequatelybiodegradable without further testing.4.3 If the surfactant reduction in the presumptive test isbetween 80 and 90%,the material should be subjected to theconfirming test.4.4 If the surfactant reduction in the presumptive test isbelow 80%,the material is considered inadequately biod

13、e-gradable.1This test method is under the jurisdiction of ASTM Committee E47 onBiological Effects and Environmental Fateand is the direct responsibility ofSubcommittee E47.04 on Environmental Fate and Transport of Biologicals andChemicals.Current edition approved Feb.1,2008.Published April 2008.Orig

14、inallyapproved in 1967.Last previous edition approved in 2001 as D2667 95(2001).DOI:10.1520/D2667-95R08.2This test method is based on“AProcedure and Standards for the Determinationof the Biodegradability of Alkyl Benzene Sulfonate and Linear Alkylate Sulfonate”by the Committee on Biodegradation Test

15、 Methods of the Soap and the DetergentAssociation,Journal of the Americal Oil Chemists Society,Vol 42,1965,p.986.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the stan

16、dards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information14.5 If it is necessary to run the confirming test,the surfactantreduction in this test must be at least

copyright@ 2008-2023 wnwk.com网站版权所有

经营许可证编号:浙ICP备2024059924号-2