ImageVerifierCode 换一换
格式:PDF , 页数:3 ,大小:65.15KB ,
资源ID:521811      下载积分:5000 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-521811.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(ASTM D6191-1997(2014) 5065 Standard Test Method for Measurement of Evolved Formaldehyde from Water Reducible Air-Dry Coatings《由可水减的空气干燥涂层离析的甲醛的测量的标准试验方法》.pdf)为本站会员(dealItalian200)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!

ASTM D6191-1997(2014) 5065 Standard Test Method for Measurement of Evolved Formaldehyde from Water Reducible Air-Dry Coatings《由可水减的空气干燥涂层离析的甲醛的测量的标准试验方法》.pdf

1、Designation: D6191 97 (Reapproved 2014)Standard Test Method forMeasurement of Evolved Formaldehyde from WaterReducible Air-Dry Coatings1This standard is issued under the fixed designation D6191; the number immediately following the designation indicates the year oforiginal adoption or, in the case o

2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method may be used to measure the amount offormaldehyde evolved from air-dry water r

3、educible coatingsutilizing latices, resin emulsions, or water reducible alkyds.The results may be used to define the “free” formaldehydeevolved from a sample under controlled laboratory conditions.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its us

4、e. It is theresponsibility 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.2. Referenced Documents2.1 ASTM Standards:2D2194 Test Method for Concentration of FormaldehydeSolutions3. Summary of T

5、est Method3.1 A sample of water reducible coating is placed on thewalls of a test tube with a drawdown rod and purged withnitrogen. The evolved formaldehyde is collected in deionizedwater with tandem impingers and measured colorimetricallyusing acetylacetone at 412 nm.4. Significance and Use4.1 This

6、 test method measures the amount of formaldehydethat is released from a coating under laboratory conditions. Theamount of formaldehyde available for release from a coatingmay vary depending on composition, and may decrease as thesample ages.4.2 This test method may be used for typical air dried pain

7、tswhere water is the major volatile material. The useful range isestimated to be from 10 ppm to 1000 ppm formaldehyde in thesample.4.3 Significant amounts of other volatile aldehydes, such asacetaldehyde, are reported to cause an interference with thedetermination of formaldehyde. This limitation is

8、 not expectedto cause a problem for most common water reducible coatings.4.4 Samples containing organic solvents as the major vola-tile component have not been evaluated and are not expected tobe compatible with this test method.5. Apparatus5.1 Formaldehyde Collection Apparatus, assembled using aflo

9、wmeter to control the nitrogen flow at ; 1.0 L/min, a 25 by200 mm outside diameter long glass test tube, and two 30-mLmidget impingers. Connections are made with glass tubesthrough a No. 4 two-hole rubber stopper and clear flexibletubing (see Fig. 1).5.2 Drawdown Bar, stainless steel No. 22 wire-wou

10、nd6.4-mm rod.5.3 Glass Sample Bottles, (;2 oz), capable of holding30-mL solution.5.4 Spectrophotometer, capable of measuring the absor-bance of solutions at 412 nm with a minimum sample light pathof 10 mm.6. Reagents6.1 Acetylacetone SolutionDissolve 150 6 0.1 g ammo-nium acetate in ;600 mL deionize

11、d water in a 1-L volumetricflask. Add 3.0-mL glacial acetic acid and 2.0-mL acetylacetone(2,4 pentanedione) and dilute to volume.6.2 Formaldehyde SolutionUse 37 % in methanol/water,commercial stock standard solution. If a commercially cali-brated 37 % standard solution is not being used, the concen-

12、tration of formaldehyde may determined in accordance withTest Method D2194. Then, the actual concentrations of theworking calibrations standards are to be calculated using themeasured value. (WarningFormaldehyde, acetylacetone,and the other reagents used in this test method are toxic or1This test me

13、thod is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved July 1, 2014. Published July 2014. Originally approvedin 1

14、997. Last previous edition approved in 2008 as D6191 97 (2008)1. DOI:10.1520/D6191-97R14.2For 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 standards Document Summ

15、ary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1hazardous. Exposure to these materials should be minimized.Consult the suppliers Material Safety Data Sheet for specifichazard information.)6.3 Formaldehyde C

16、alibration StandardsPrepare a 100-ppm stock solution by diluting 25 uL of the 37 % formaldehydesolution to 100 mL with deionized water. Dilute this interme-diate stock solution to prepare at least 5 calibration standards.Pipeting 0.5, 3, 5, 7 and 10 mL aliquots of the stock solutioninto 100-mL volum

17、etric flasks and diluting with deionizedwater will prepare calibration standards of 0.5, 3, 5, 7 and 10ppm formaldehyde.7. Calibration7.1 Prepare a series of at least 5 standards (6.3) plus a blankby adding 5 mL of the formaldehyde calibration standards or 5mL deionized water into test tubes. Proces

18、s the standard alongwith the samples as described in 8.5 to 8.6.7.2 Construct a calibration curve by plotting the absorbanceof the calibration standards versus concentration of formalde-hyde (ppm). Prepare a new calibration curve with every batchof samples being analyzed.8. Procedure8.1 Assemble the

19、 collection apparatus as shown in Fig. 1.The ;1.0 L/min. flow rate should be determined by timing theflow with a bubble tube. If the impingers are not accuratelygraduated, pipet 15-mL deionized water into the impingertubes and mark the level for future reference.8.2 Place about 1 to 1.5 g of the liq

20、uid sample into a taredtest tube and evenly spread the sample on the walls with a No.22 drawdown rod. The bottom couple of inches of the test tubewill not be coated and the top ;12 in. of the tube should bewiped free of coating with a paper towel to avoid having painton the stopper. Quickly weigh th

21、e coated test tube and recordthe weight of the liquid sample.8.3 Without delay, connect the test tube to the apparatuscontaining 15-mL deionized water in each impinger and purgewith nitrogen at ;1.0 L/min for 2 h.8.4 With the nitrogen flowing, remove the impinger tubefrom the No. 2 impinger. If the

22、sampling liquid is less than theoriginal 15 mL volume, restore the volume to 15 mL whilerinsing the impinger tube with deionized water. Disconnect theNo. 1 impinger in the series and rinse the impinger tube withdeionized water in order to restore the volume to 15 mL. Pourthe No. 1 impinger solution,

23、 which should contain most of theformaldehyde, into a ;2-oz. bottle. Use the No. 2 impingersolution to wash the No. 1 impinger tube and mix the combinedsolutions in the sealed bottle.8.5 Pipet 5 mL of the impinger solution (or a dilutedsolution) into a ;20-mL glass test tube and add 5 mL of theacety

24、lacetone solution. Mix the prepared test solutions and heatthe test tubes in a 40 6 0.5C water bath for 30 min.8.6 Remove the test tubes from the water bath and let standfor 30 min to cool. Measure the absorbance at 412 nm with aspectrophotometer using a 1-cm cell and deionized water as thereference

25、.8.7 From the calibration curve, determine the concentrationof the combined impinger solution. If the concentration of thetest solution is greater that the highest standard, make appro-priate dilutions of the impinger solution and repeat 8.5 to 8.6with freshly prepared standards. Some analysts may p

26、refer toprepare dilutions initially rather than repeat the standardpreparation process.9. Calculation9.1 Calculate the amount of formaldehyde that is evolvedfrom the sample as follows:ppm Formaldehyde 5C 330 3DW(1)where:C = concentration from calibration curve (8.7),30 = volume (mL) of water in the

27、impingers,D = dilution factor if diluted, andW = sample weight, g.10. Report10.1 Report the concentration of evolved formaldehydefrom the sample as parts per million rounded to two significantdigits.11. Precision and Bias11.1 RepeatabilityTo be determined.11.2 ReproducibilityTo be determined.11.3 Bi

28、asThe bias can not be determined since no validstable reference material is available.12. Keywords12.1 air-dry water reducible coatings; evolved formalde-hydeFIG. 1 Formaldehyde Collection ApparatusD6191 97 (2014)2ASTM International takes no position respecting the validity of any patent rights asse

29、rted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by

30、 the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will recei

31、ve careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Inter

32、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 97 (2014)3

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