ISO-78-4-1983.pdf
《ISO-78-4-1983.pdf》由会员分享,可在线阅读,更多相关《ISO-78-4-1983.pdf(7页珍藏版)》请在三一文库上搜索。
1、International Standard ( 7814 0 N 4 4g!i!i INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON*MEXUlYHAPOHAR OPrAHH3AUHR l-l0 CTAH for the other clauses, see IS0 78/2. The aim in elaborating this part of IS0 78 has been to provide editors with a guide which can be used wherever possible. Where this stand
2、ard layout cannot be followed exactly, it will be for editors to modify the recommended layout, adapting it to analytical demands. In particular, the description of certain determinations will not require the inclusion of all the clauses or sub-clauses provided in the layout, while in other cases ex
3、tra clauses or sub-clauses may occasionally be needed. Consequently, the only inflexible rules are the following : a) use the terminology given in IS0 6955; b) where possible and justifiable, include the clauses and sub-clauses indicated in the layout, and arrange them in the sequence indicated (it
4、is possible and even advisable to rear- range them where strictly following the plan would lead to sub-clauses having little meaning); c) only ignore instructions given in this part of IS0 78 if they are not applicable. 2 Introduction This clause can usefully make reference to IS0 6!356 and speciall
5、y to its annex about safety, and to IS0 6955 for the cor- rect nomenclature. 3 Field of application This clause shall contain exact indications on the field of application of the method (definition of products to which the method is applicable, limit of content for which the method is valid). In add
6、ition to these indications it is necessary to report the interfering constituents as well as their contents which give interferences (see sub-clause 5.2 of IS0 6955) or the inter- ferences of other origin which render inapplicable the specified procedure. This clause should also indicate any special
7、 cases and the clauses in which they will be dealt with. 4 References This clause must contain a complete list of all documents or International Standards which are indispensable for the appli- cation of the specified method of analysis. NOTE - This list shall not include technical documents which a
8、re merely used as references in the preparation of the method; such documents can be mentioned in the clause ( Bibliography D. 5 Principle This clause should indicate concisely the essential steps of the method (preferably using substantive phrases), excluding details relating to the procedure. It s
9、hall thus, on the one hand contain the physical and chemical principles of preparations (e.g. : ashing, solution preparation, extraction, separation, addition of complexing agents and spectrochemical buffers) preceding the stage corresponding to the atomic absorption spectrometry and, on the other,
10、the characteristics of this stage. With regard to this last statement, it shall mention: a) the type of atomizers (see clause 2 of IS0 6555); b) the wavelength(s) of the line(s) used; c) the type of detection and correction of non-specific at- tenuation; d) the type of method (see sub-clause 6.1 of
11、IS0 69551, namely : I) direct method of determination, 2) determination by the bracketing technique, 3) (analyte) addition technique, 4) reference-element technique, 5) indirect method. 6 Reagents This clause, set out in accordance with the details given in IS0 78/2, shall indicate in particular how
12、 the standard solution for the members of the set of calibration solutions shall be prepared. The quality of reagents should be precisely indicated and also, where necessary, the processes of checking and purification. 7 Apparatus It is not necessary to include in this list ordinary laboratory appar
13、atus required to carry out the method. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:42:09 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 78
14、/4-1983 (El On the other hand, it should define the particular equipment and for the spectrometer it should indicate a) the source(s) emitting the characteristic lines; b) the type and the characteristics of the atomizer (type of burner, type of gases, etc.); c) the maximum permissible spectral band
15、width for the wavelengths of the spectral line(s) and the necessity or not of a device for correcting random fluctuations; d) other special devices. Where necessary, include a reference to IS0 6956 with regard to the performances which may be required and for checking the condition of the equipment.
16、 8 Procedure It should be remembered that the layout that is the subject of this part of IS0 78 should not be regarded as universally ap- plicable. In some circumstances, preliminary tests should be foreseen designed, for example, to detect or correct non- specific attenuation (see IS0 6956). It is
17、then for the editor to decide how the corresponding sub-clauses should be inserted between the sub-clauses provided for in the layout, how to make the text understood and how best to carry out the method. The following is the only inflexible rule : as far as possible, in- clude each time all the sub
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 78 1983
链接地址:https://www.31doc.com/p-3779904.html