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1、STD-IS0 793i.I-ENGL 1998 = q85L903 0753779 997 INTERNATIONAL STANDARD IS0 7934 First edition AMENDMENT 1 1989-08-01 1998-07-01 Stationary source emissions - Determination of the mass concentration of sulfur dioxide - Hydrogen peroxide/barium perch I or a ten h or i n method AMENDMENT 1 missions de s
2、ources fixes - Dtermination de la concentration en masse de dioxyde de soufre - Mthode au peroxyde dhydrogne/perchlorate de baryum/Thorin AMENDEMENT 1 This material is reproduced from is0 documents under International Organization for Standardization (ISO) Copyright License number IHS/ICC/1996. Not
3、for resale. No part of these IS0 documents may be reproduced in any form, electronic retrieval system or otheiwise, except as allowed in the copyright law of the country of use, or with the prior written consent of IS0 (Case postale 56,1211 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHS orthe IS
4、0 Licensors members. Reference number IS0 7934:1989/Amd.l:1998(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without lice
5、nse from IHS -,-,- STD-IS0 773Li-ENGL 1998 LiA5L903 0753780 b0S iie: IS0 7934:1989/Amd.l:1998(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally car
6、ried out through IS0 technical 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
7、. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires
8、approval by at least 75 % of the member bodies casting a vote. Amendment 1 to International Standard IS0 7934:1989 was prepared by Technical Committee ISOTTC 146, Air quality, Subcommittee SC 1, Stationary source emissions. o IS0 1998 All rights reserved. Unless otherwise specified, no part of this
9、publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-121 1 Genve 20 Switzerland Internet centraliso.ch
10、 X.400 c=ch; a40Onet; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted with
11、out license from IHS -,-,- STDmISO 7934-ENGL 1998 = q853703 0753783 5Li5 IS0 IS0 7934:1989/Amd.l:1998(E) Introduction Comparative measurements of the mass concentration of sulfur dioxide (both in laboratory and under field conditions) using IS0 7934, the method described in IS0 11632 and the UV-inst
12、rumental method in IS0 7935 have shown that significantly lower values in the range of 5 YO to 10 Yo are obtained with the method in IS0 7934. Investigations have revealed that the difference disappears when using potassium hydroxide instead of sodium hydroxide to adjust the pH of the absorption sol
13、ution before analysis. Therefore new subclauses 4.4 and 6.7 replace those of IS0 7934:1989. Also, for practical reasons, the male and female cones in the particle filter shown in figure 1 have been changed. . 111 Copyright International Organization for Standardization Provided by IHS under license
14、with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- 8 IS0 STDmISO 7934-ENGL 1978 M 4851903 0753782 481 IS0 7934:1989/Amd.l:1998(E) Stationary source emissions - Determination of the mass
15、 concentration of sulfur dioxide - Hydrogen peroxide/barium perchlorate/Thorin method AMENDMENT 1 Page 2 Replace existing subclause 4.4 with the following: 4.4 Potassium hydroxide, standard volumetric solution c(K0H) = 0,l mol/l. Page 3 Replace existing subclause 6.7 with the following: 6.7 Adjust t
16、he pH of the combined sample solution, using the pH meter (5.2), to pH 3,5 by adding the appropriate volume of the standard volumetric potassium hydroxide solution (4.4) or the standard volumetric perchloric acid solution (4.5) as required to the combined sample solution. Transfer the resultant comb
17、ined sample solution into a one-mark volumetric flask of suitable nominal capacity (see table 1) NOTE - The volumes of the treated joint sample solutions in table 1 may be exceeded in cases with waste gases containing high moisture contents. In such cases, a larger volumetric flask will be needed. M
18、ake up to the mark with water and mix well. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- STD
19、DISO 7934-ENGL 1998 D 4851703 0753783 318 IS0 7934:1989/Amd.l:1998(E) Page 6 Replace existing figure 1 with the following new figure 1. Dimensions in millimetres s 19 , I .2 S 191 Key 1 Quattzwool, about 0,5 g to 0,8 g, packed progressively 2 Perforated plate or sintered filter Figure 1 - Example of
20、 a particle filter 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 773Lt-ENGL 1778 48
21、51703 0753784 25i IS0 7934:1989/Amd.l:1998(E) ICs 13.040.40 Descriptors: air, quality, air pollution, exhaust emissions, chemical analysis, determination of content, sulphur dioxide. Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with IS
22、O Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- I N TE R NAT I O NA L STANDARD IS0 7934 First edition 1989-0841 Stationary source emissions - Determination of the mass concentration of sulf
23、ur dioxide - Hydrogen peroxide/barium perchloratelThorin method missions de sources fixes - Dtermination de ia concentration en masse de dioxyde de soufre - Mthode au peroxyde dhydrogneiperchlorate de baryum/ Thorin Reference number IS0 7934 : 1989 (EI t Copyright International Organization for Stan
24、dardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7934 : 1989 (E) Foreword IS0 (the International Organization for Standardization) is a w
25、orldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented
26、on that committee. International organizations, govern- mental and non-governmental, in liaison with ICO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards ad
27、opted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 7934
28、was prepared by Technical Committee ISO/TC 146, Air quality. .- o IS0 1989 All rights reserved. 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 in writing from the publisher. Int
29、ernational Organization for Standardization Case postale 56 o CH-1211 Genve 20 o Switzerland Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo
30、 reproduction or networking permitted without license from IHS -,-,- I N TE R NATI O N AL STAN DAR D IS0 7934 : 1989 (E) Stationary source emissions - Determination of the mass concentration of sulfur dioxide - Hydrogen peroxde/barium perchlorate/Thorin method 1 Scope This International Standard spe
31、cifies a hydrogen per- oxide/barium perchlorate/Thorin 11 method for the determi- nation of the mass concentration of sulfur dioxide emitted from combustion facilities and technical processes with negligible amounts of sulfur trioxide and sulfuric acid. It is applicable from a minimum of 30 mg/m3 su
32、lfur dioxide by reference to sampling periods of normally 30 min. At mass concentrations of sulfur dioxide greater than 2 o00 mg/m3, the volume of the waste gas under investigation passed through the sampling train is 30 litres. Substances, which, if contained in the waste gas under in- vestigation
33、and thus in the waste gas sample, are known to have an effect on the titration reading, are given in 7.4. Infor- mation on performance characteristics is given in 8.2. At mass concentrations of sulfur dioxide less than 30 mg/m3, a sampling period greater than that specified in this International Sta
34、ndard is used. - . . All concentrations are based on dry gas at a temperature of 273,l K and a pressure of 101,3 kPa. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publicat
35、ion, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registe
36、rs of currently valid International Stan- dards. IS0 3696 : 1987, Water for analytical laborztory use - Specification and test methods. IS0 6879 ; 1983, Air quality - Performance characteristics and related concepts for air quality measuring methods. 3 Principle Absorption of the sulfur dioxide pres
37、ent in the waste gas sample passing through a hydrogen peroxide solution within a specified period, resulting in the formation of sulfuric acid solution. Adjustment of the pH of the sample solution to pH 3,5 with sodium hydroxide solution or perchloric acid solution as re- quired. Determination of t
38、he mass concentration of sulfate ions present in the treated sample solution by titration with a barium perchlorate solution using Thorin as indicator and calculation of the mass concentration of sulfur dioxide. 4 Reagents During the analysis use only reagents of recognized analytical grade and only
39、 water of at least grade 3 purity according to IS0 3696. WARNING - Use the reagents in accordance with the appropriate health and safety regulations. 4.1 Propan-2-01 CH3CHOH)CH31. 4.2 Absorption solution. Place 100 ml of a 27 YO (m/n7) to 30 % r77/71! solution of hydrogen peroxide (li,O,I into a 1 0
40、00 mf one-mark volumetric flask. Make up to the mark with water and mix well. Prepare this solution on the day of use. 4.3 c(Ba(CIO rinse the electrodes thoroughly before use. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Stan
41、dards 1/9972545001 Not for Resale, 04/21/2007 10:18:48 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 Sampling 6.1 Depending on in which of the ranges given in table 1 the expected mass concentration of sulfur dioxide lies, place, for example by pipette or dispenser, eit
42、her 40 ml of the absorption solution (4.21 into each of the two 100 ml absorbers (5.1.31, or 80 ml of the absorption solution into each of the two 250 ml absorbers (5.1.31. Assemble the absorbers used and the apparatus specified in 5.1.1 to 5.1.2 and 5.1.6 to 5.1.11, to obtain a sampling train in ac
43、cordance with the examples schematically represented in figure 3. Use spherical ground glass joints upstream of the second absorber. 6.2 Plug the intake of the sampling probe (5.1.11, switch on the sampling pump (5.1.7) and leak test the sampling train following normal laboratory practice. 773Y-87 I
44、 4 8 5 1 9 0 3 0077944 3 Is0 7934 : 1989 (E) Carefully release the sampling probe intake plug and switch off the sampling pump. 6.3 Insert the sampling probe into the access hole in the wall of the waste gas flue and place the tip of the sampling probe at the representative measurement point(s) in t
45、he measurement plane of the waste gas flue. Fill the resultant space between the sampling probe and the access hole in the wall of the waste gas flue with an appropriate sealing material such that ambient air does not reach the measurement points) nor waste gas escape to any great degree. 6.4 Take n
46、ecessary measures to stop ambient air entering the waste gas flue through the space between the sampling probe and the heating jacket, thus causing a local cooling of the sampling probe and altering the sample composition. Wrap the particle filter (5.1,2) in the heating bandage (5.1.4). Switch on th
47、e-heating system and adjust the voltage regulator (5.1.5) to give a temperature at each point within the heated zone at which, during the sampling period, the formation of condensate will not be possible. NOTE - The temperature of the heating bandage may be checked with a thermocouple. At the end of
48、 the heating up period (about half an hour) record the reading on the gas meter (5.1.9) and the time, start the sampling pump and adjust the regulating valve (5.1.8) to give the desired waste gas-volume flow rate within the range of 0,03 m3Ih to 0,2 d l h . 6.5 Normally, the sampling period is 30 min. Record the reading on the gas meter thermometer (5.1.111, Bi, and the reading on the barometer (5.1.121. The waste-gas volume flow rate selected shall be approximatel