1、BS ISO 1952:2008ICS 73.040; 75.160.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDSolid mineral fuels Determination ofextractable metals indilute hydrochloricacidThis British Standardwas published underthe authority of theStandards Policy andStrategy Committe
2、e on 30September 2008 BSI 2008ISBN 978 0 580 57040 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 1952:2008National forewordThis British Standard is the UK implementation of ISO 1952:2008.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mi
3、neral fuels.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immu
4、nityfrom legal obligations.BS ISO 1952:2008Reference numberISO 1952:2008(E)ISO 2008INTERNATIONAL STANDARD ISO1952Second edition2008-09-01Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid Combustibles minraux solides Dtermination des mtaux extractibles dans lacide ch
5、lorhydrique dilu BS ISO 1952:2008ISO 1952:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer
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8、ral Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, 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
9、 in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS
10、 ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents and materials . 1 5 Apparatus 4 6 Preparation of the test sample 4 7 Procedure 4 8 Expression of results . 5 9 Precision 6 10 Test
11、report . 6 BS ISO 1952:2008ISO 1952:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO t
12、echnical 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. ISO collaborates clos
13、ely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draf
14、t International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this docum
15、ent may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1952 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5, Methods of analysis. This second edition cancels and replaces the first edition (I
16、SO 1952:1976), which has been technically revised. BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved vIntroduction Sodium, potassium, calcium, iron and magnesium are commonly present in solid mineral fuel. They can contribute significantly to coal-utilization problems, such as boiler-tub
17、e fouling and ash disposal; they also affect product quality and gaseous emissions from combustion processes. Research indicates that the amounts of alkaline and earth-alkaline metals extractable with dilute hydrochloric acid are more closely related to the fouling/slagging properties of solid miner
18、al fuel than are the total amounts of the metals. BS ISO 1952:2008BS ISO 1952:2008INTERNATIONAL STANDARD ISO 1952:2008(E) ISO 2008 All rights reserved 1Solid mineral fuels Determination of extractable metals in dilute hydrochloric acid 1 Scope This International Standard describes the extraction fro
19、m solid mineral fuels by dilute hydrochloric acid and determination of extractable sodium, potassium, calcium, iron and magnesium. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
20、or undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use Specification and test methods ISO 5068-2, Brown coals and lignites Determination of moisture content Part 2: Indirect gravimetric method for moistur
21、e in the analysis sample ISO 5069-2, Brown coals and lignites Principles of sampling Part 2: Sample preparation for determination of moisture content and for general analysis ISO 5725-6:1994, Accuracy (trueness and precision) of measurement methods and results Part 6: Use in practice of accuracy val
22、ues ISO 11722, Solid mineral fuels Hard coal Determination of moisture in the general analysis test sample by drying in nitrogen ISO 13909-4, Hard coal and coke Mechanical sampling Part 4: Coal Preparation of test samples 3 Principle A portion of the sample is extracted with hot, dilute hydrochloric
23、 acid after wetting of the solid mineral fuel with alcohol. All forms of sodium, potassium, magnesium, calcium, iron that are exchangeable or extractable with the hydrochloric acid are extracted from the coal. After removal of the residual solid mineral fuel by filtration, the concentrations of the
24、elements in the filtrate are determined by atomic absorption spectrometry. The concentrations of the elements may also be determined by ICP-OES if the instrument has been validated for the quantification in an appropriate manner. 4 Reagents and materials Use analytical reagent grade chemicals. Other
25、 grades can be used, provided it is documented that the reagent is of sufficiently high purity to permit its use without adversely affecting the accuracy of the determination. BS ISO 1952:2008ISO 1952:2008(E) 2 ISO 2008 All rights reserved4.1 Water, high-purity deionized water as defined in ISO 3696
26、, or as defined by the equivalent national standard. 4.2 Ethanol. 4.3 Hydrochloric acid (HCl). 4.4 Hydrochloric acid, concentrated, 20= 1,19 g/ml. 4.5 Hydrochloric acid solution, prepared by mixing 1 part concentrated hydrochloric acid (4.4) with 1 part deionized water (4.1). DANGER The addition of
27、the strong acid, HCl, to water liberates a significant amount of heat and can cause a violent reaction. 4.6 Nitric acid (HNO3), concentrated, 20= 1,42 g/ml. 4.7 Lanthanum oxide (La2O3). 4.8 Lanthanum solution. Dissolve 23,4 g of La2O3(4.7) in 350 mL of deionized water (4.1). Slowly add 50 mL of conc
28、entrated nitric acid. Stir until solution is completely mixed, transfer to a 1 l volumetric flask, dilute to the mark with water. DANGER The addition of the strong acid, HNO3, to water liberates a significant amount of heat and can cause a violent reaction. NOTE The lanthanum solution is used as an
29、ionization suppressant during calcium determination. It is possible to use other commonly used ionization suppressants, e.g. cesium, as a alternative. 4.9 Magnesium perchlorate, anhydrous, 2,0 mm +0,7 mm, used as a desiccant. DANGER Regeneration of magnesium perchlorate by oven drying should not be
30、attempted because of the risk of explosion. Magnesium perchlorate is a strong oxidant, and should be kept away from organic materials such as oils, greases and organic solvents. 4.10 Stock solutions 4.10.1 Sodium chloride (NaCl). 4.10.2 Sodium solution, 1 000 mg/L. Dissolve 2,542 g of sodium chlorid
31、e (4.10.1) (previously dried at 110 C for 1 h) in 200 mL of deionized water (4.1), stir until solution is completely mixed, transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.3 Potassium chloride (KCl). 4.10.4 Potassium solution, 1 000 mg/L. Dissolve 1,907 g of potassium chlorid
32、e (4.10.3) (previously dried at 110 C for 1 h) in 200 ml of water (4.1), transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.5 Calcium carbonate (CaCO3). 4.10.6 Calcium carbonate solution, 1 000 mg/L. Dissolve 2,497 g of calcium carbonate (4.10.5) (previously dried at 110 C for 1
33、 h) in a solution containing 10 ml of concentrated hydrochloric acid (4.4) and 200 ml of deionized water (4.1), stir until solution is BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved 3completely mixed. Bring to a gentle boil to remove excess carbon dioxide. Cool the solution, transfer
34、to a 1 l volumetric flask, dilute to the mark with water. 4.10.7 Magnesium oxide. 4.10.8 Magnesium solution, 1 000 mg/L. Place 1,658 g of magnesium oxide (4.10.7) (previously heated at 1 000 C for 1 h) in solution containing 10 ml of concentrated hydrochloric acid (4.4) and 200 ml of deionized water
35、 (4.1), stir until solution is completely mixed. Warm until dissolved, cool, transfer to a 1 l volumetric flask, dilute to the mark with water. 4.10.9 Iron, minimum purity 99,8 % Fe. 4.10.10 Iron solution, 1 000 mg/L. Place 1,000 g of pure iron (4.10.9) in a solution containing 20 ml of concentrated
36、 hydrochloric acid (4.4) and 20 ml of deionized water (4.1), stir until solution is completely mixed. Heat to boiling and gently simmer until dissolved. Cool, transfer to a 1 l volumetric flask, dilute to the mark with deionized water. 4.10.11 Commercial stock solutions, optional, certified stock so
37、lutions with a concentration of the ion of interest of 1 000 mg/l that can be used as an alternative to preparing stock solutions. 4.11 Calibration solutions, prepared with the volumes of reagents given in Table 1. Prepare calibration solution A, by adding 40 ml of lanthanum solution (4.8) and 32 ml
38、 of hydrochloric acid solution (4.5) to a 1 l volumetric flask. Add 1 ml of each stock solution and stir until the solution is completely mixed. Dilute to the mark with water. Prepare calibration solutions B, C, D, E and the calibration BLANK in the same way as calibration solution A using the volum
39、es of each stock solution shown in Table 1. Additional calibration solutions within the range of those described here may be prepared in the same manner, in order to increase the number of points on the calibration graph. This can be necessary because of the wide ranges of analyte concentrations lik
40、ely to be encountered, and also because of the variations in spectrometer responses. The calibration solutions should be stored in screw-top polyethylene bottles. They should be discarded after three months. Table 1 Volumes of reagents for calibration solutions Calibration solution Concentration of
41、calibration solution mg/l Volume of stock solution ml Volume of lanthanum solution ml Volume of hydrochloric acid solution ml A 1 1 40 32 B 2 2 40 32 C 3 3 40 32 D 4 4 40 32 E 5 5 40 32 BLANK 0 0 40 32 4.12 Filter paper, medium-textured filter paper. BS ISO 1952:2008ISO 1952:2008(E) 4 ISO 2008 All r
42、ights reserved5 Apparatus 5.1 Dispensers for reagents, with the following capacities: 5.1.1 for ethanol 5 ml, graduated. 5.1.2 for hydrochloric acid 10 ml, graduated to fit on top of the hydrochloric acid container. 5.1.3 for lanthanum solution 10 ml. 5.2 Hotplate. 5.3 Atomic absorption spectrometer
43、. 5.4 Desiccator, with desiccant. 5.5 Plastic bottles, polyethylene or polypropylene with screw caps, giving an airtight seal, for storage of all solutions. Condition the bottles before use, by filling with nitric acid (4.6) diluted 1 + 9. Allow to stand for at least 48 h. Rinse the bottles thorough
44、ly with water. 5.6 Glassware, 250 ml beaker and 250 ml volumetric flask. 6 Preparation of the test sample The sample shall be the general test sample prepared in accordance with ISO 13909-4 or ISO 5069-2. 7 Procedure 7.1 Preparation of test portion Weigh approximately 1,5 g of the test sample to the
45、 nearest 2 mg into a 250 mL glass beaker. Concurrently, determine moisture in accordance with ISO 5068-2 or ISO 11722. 7.2 Preparation of test solution Add 4 ml of ethanol to a glass beaker. Make a paste of the solid mineral fuel, stirring with a glass rod until the sample is thoroughly wetted. Do n
46、ot remove the stirring rod. Add 50 ml of deionized water to the beaker. Add 8 ml of the hydrochloric acid solution (4.5) to the beaker. Bring the solution to a boil. Heat at just below boiling for 15 min on a hotplate. Cover with a watch glass. Heat at just below boiling for a further 45 min. Care s
47、hould be taken to maintain the volume in the beaker at approximately 50 ml with deionized water throughout the digestion. Cool, without swirling. NOTE This procedure ensures that all of the ethanol is removed. Filter the sample by decantation into a 250 ml volumetric flask through a filter paper. Ri
48、nse the beaker and stirring rod with hot hydrochloric acid solution, taking care to transfer all the contents onto the filter paper. Rinse the filter paper three times with about 20 ml portions of hot, hydrochloric acid solution. Cool the flask, then add 10 ml of lanthanum solution to the flask. Mak
49、e the flask up to volume with deionized water and mix thoroughly. A blank test solution, which contains all the analytical reagents present in the test solution, shall be prepared by the same procedure as the test solution. BS ISO 1952:2008ISO 1952:2008(E) ISO 2008 All rights reserved 57.3 Analysis of test solutions The atomic absorption spectrometer shall be prepared for operation in accordance with the manufacturers instructions. Recommended gases and wavelengths are given in Table 2. Table 2 Re
