1、STD-BSI BS EN 1217b-ENGL 1778 = Lb24bb7 070881b 217 BS EN 12 176:1998 BRITISH STANDARD The European Standard EN 121761998 has the status of a British Standard ICs 13.030.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Characterization of sludge - Determination of pH value S
2、TD-BSI BS EN LZL7b-ENGL 1998 Lb29bbS 0708837 153 BS EN 121761998 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1998 0 BSI 1998 ISBN O 680 29142 1 Na
3、tional foreword This British Standard is the English language version of EN 121761998. The UK participation in its preparation was entrusted to Technical Commiee EW5, Sludge characterization, which has the responsibility to: - aid enquirers to understand the te* - present to the responsible European
4、 committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cro
5、ss-references The Britkh Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Internationa,l Standards Correspondence Index“, or by using the “Findn facility of the BSI Standards Electron
6、ic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Usem of British Stan- 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 c
7、omprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. Amendments issued since publication AmdNo. ID - urban wastewater collecting systems; - urban wastewater treaiment plants; - treating industrial wastewater similar to urban wastewate
8、r (as defined in Directive 91/271 EEC); - water supply treatment plants; - water distribution systems; - but excluding hazardous sludges from industry This method is applicable to the determination of pH values of sludges which include liquid, pastelike or solid matter. If the sludge sample is suffi
9、ciently liquid, direct measurement should be made. If the sludge sample contains reiatively high percentages of solids the measurement should be carried out after dilution with water. - night soil; 2 Normative references This European Standard incorporates by dated or undated reference, provisions f
10、rom other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendment to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendm
11、ent or revision. For undated references the latest edition of the publication referred to applies. prEN 12880, Characterization of sludges - Deternainuton of dry residue and water conlent. IS0 3696, Water for anaiytical laboratory use - Specfkation and test methods. IS0 105231994, Water quality - De
12、termination of pH. Page 3 EN 121761998 3 Definitions For the purpose of this standard the following definitons apply: 3.1 pH-value the pH value of an aqueous solution is theoretically a function of the electromotive force of a measuring cell (e.g. a glass electrode and a calomel electxode) which is
13、defined by the equation given in annex A of IS0 105231994. The pratical pH scale refers to exactly specified buffer solutions 3.2 standard buffer solutions solutions of certain concentrations of pure substances or mixtures thereof with defined pH values 4 Principle A suitable aqueous suspension of t
14、he solid or paste-like sludge is prepared and the pH value of the suspension is determined potentiometrically In liquid samples the measurement is made directly 5 Interferences Substances present at their normal concentration in these types of samples do not cause significant interference. The pH va
15、lue of suspensions is dependent, to a considerable extent, on the carbon dioxide equilibrium. Therefore manipulation after the sampiing of liquid sludge and after the preparation of suspensions should be kept to a minimum. If oil or grease is visible in the sample, it should be removed by filtsation
16、 through a pad of cotton wool (8.9) prior to carrying out the measurement. The presence of sulfides or arsenic may poison the glass interface of the electrode. Electrodes with a low “alkali error” should be used for the measurement of sludges expected to be of a high NOTE 1 Glass electrodes normally
17、 respond tn sodium ions at pH values above 9. This may cause errors in the measurement of the pH values of samples such as lime conditioned sludges. NOTE 2 A film may form on the surface of the pHelectrodes due to oil and grease. This may lead to enors in the measuring results. Inorganic film-formin
18、g substances may also interfere if not removed from the pHelectrodes between determinations. NOTE 3 If sludge samples are taken from a digester, digester gas may escape causing changes in the carbon dioxide content, which may lead to errors in the measured results. PH. O BSI 1998 STD-BSI BS EN 1217b
19、-ENGL 1778 1b2qbb7 0708823 b8q Page 4 EN i2176A998 6Hazards Samples of sewage sludge are liable to ferment Do not store them in the open laboratmy If samples must be stored, then store them at (O to 4) “C. When handling a stored sample wear gloves, face and eye protection and sutcient body protectio
20、n to guard against bottles bursting. Use bottle carriers. The gas evolved is usuaily fiammable so ail equipment in the vicinity should be flame-proof and sources of ignition absent. Bursting glass bottles can produce micrwxganhn contamuiated shrapnel. Plastic bottles can also burst and produce a haz
21、ardous spray and aerosol. Ensure that ail spdlages are cleared up. Do not handle broken There is also a danger of hydrogen sulfide formation during storage. Cap loosely to avoid pressure build-up. Sludge usuaily contains harmful organisms. Cleanliness is essential Keep sludge away from food and eati
22、ng. Protect all cuts. glas directly 7 Reagents Anaytical grade reagents shail be used 7.1 Water For the preparation of standard buffer solutions (see 3.2) freshiy distilled or deionised water freshiy taken hm a column according to EO 3696, Grade 3 shall be used It shail be free from carbon dioxide a
23、nd have a conductivity of 5 2 Ncm. 7.2 Stadd buffr solutions These shall be in accordance with IS0 10523 and annexA (normative). Such solutions are available commerce. 7.4 Acetone, (CH3COCH3). 7.3 Ethanol, (CH$HzOH), 70 % VN 8 Apparatus %perature compensated input mistance 2 1012 R readable to at le
24、ast pH = Q,05, slope correction in mV4H 8.2 Glass - all information necessary for complete identifmition of the sludge sample; - details of sample pretrea4nent and preparation; - resuits of the determination according to clause 11; - any details not specified in this European standard or which are o
25、ptionai and any other factors which may have afected the resulb. * rn * O ES1 1998 Page 6 EN i21761998 F Borax 9,464 9,395 9,332 9,276 9,225 9,180 9) 139 9,102 9,068 9,038 9,011 Annex A (normative) Primary pH-stanaard reference solutions (according to IS0 10623) I sodium carbonatelsodium hydrogen ca
26、rbonate 10,317 10,245 10,179 10,118 10,062 10,012 9,966 9,926 9,889 9,856 9,828 Table A.1- DH values of standard buffer solutions 0,027 Temperature OC 0,016 0,029 0,020 0,029 O 5 10 15 20 25 30 35 40 45 50 + 0,049 + 0,052 + 0,080 + 0,Ol Buffer due + 0,079 B Potassium hydrogen tartrate - - - - - 3,55
27、7 3,552 3,549 3,547 3,547 3,549 Primary pH-s C Potassium hydrogen phthalate) 4,000 3,998 3,997 3,998 4,001 4,005 4,011 4,018 4,027 4,038 4,050 ndard buffer soi D Phosphate APHm Preparation of the standard solutions. Aways use wahr free from carbon dioxide and B Potassium hydrogen tartsate, saturated
28、 at (25 f 2) OC; C: Potassium hydrogen phthalate, b = 0,05 morn, Dissolve 10,21 g of Ca (COOH) (COOK), that has been dried for 2 h at (120 f 5) OC, in water at (25 f 2) OC and bring to volume with water in a 1 1 volumetric flask D Disodium hydrogen phosphate, b = 0,025 mom and potassium dihydrogen p
29、hosphate, b = 0,025 mom. Dissolve 4,45 g of N%“04 e2 H20 (or 3,515 g of Na2Hpo4) and 3,40 g of KH2PO4 in water at (25 f 2) OC and bring to volume with wateE The anhydrous sai6 are dried for 2 h at (120 f 5) OC; F: Sodium tetraborate (borax), b = 0,Ol moM. Dissolve 3,81 g of NeB407 el0 HzO in water a
30、t (25 * 2) OC and bring to 1 1 with wateq I: Sodium carbonate, b = 0,025 moM, and sodium hydrogen carbonate, 0 = 0,025 moM. Dissolve 2,640 g of N%CO3, that has been dried for 90 min at (250 f 5) OC and 2,092 g of NaEIC&, that has been dried for 2 days f 2 h over a molecular sieve, in water and bring
31、 to 1 1 with water. Annex B (informative) Bibliographid references 11 2 NI? X 31-117:1994, wit6 du sol - &*t?miWtiOn du PH DIN 19263, PH-mmt - Glass &mdes 3 5 DIN 19264, pH-mmt - Rqfhmce &- DIN 19266, pH-mt - Slandaml hffi Solutions BS 1647-2, SfxztiOn for r&mnce ualue sta&d solutions and operationa
32、l e standard solutions IS0 103Nk1994, Soil mitg - &temL.ination Of pH 4 6 O BSI 1998 STD-BSI BS EN 1217b-ENGL 1998 9 1b24bb9 0708824 393 W BS EN 12 1761998 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent donal body responsible for preparing British
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