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1、INTERNATIONAL STANDARD IS0 1841-2 First edition 1996-07-01 Meat and meat products - Determination of chloride content - Part 2: Potentiometric method Viande et produits 2 base de viande - D range at least + 700 mV, e.g. digital type. 5.6 Pipette, o If capacity 50 ml. 5.7 Analytica accuracy of VI is
2、the volume, in millilitres, of the silver ni- trate solution (4.3) used in the determination (8.4); V2 is the volume, in millilitres, of the silver ni- trate solution (4.3) used in the blank test (8.5); C is the concentration, in moles per litre, of the silver nitrate solution (4.3); ml is the mass,
3、 in grams, of the test solution (8.2.2); m is the mass, in grams, of the test portion; Report the result to the nearest 0,l % (m/m). 10 Precision The precision of the method has been established by an interlaboratory test (see reference 1511, carried out in accordance with IS0 5725. For the values o
4、btained for the repeatability limit, I-, and the reproducibility limit, R, a probability level of 95 % holds. 10.1 Repeatability The absolute difference between two independent single test results, obtained using the same method on identical test material in the same laboratory by the same operator
5、using the same equipment within a short interval of time, should not be greater than the repeatability limit r as calculated using the following equation: where age bY 41 is the mean of both results, as a percent- mass. 10.2 Reproducibility The absolute difference between two single test re- sults,
6、obtained using the same method on identical test material in different laboratories with different operators using different equipment, should not be greater than the reproducibility limit R as calculated by the following equation: R= 0,005+0,066Wcl - where wcI is the mean of both results, as a perc
7、ent- age bY mass. 11 Test report The test report shall specify: - the method in accordance with which sampling was carried out, if known; the method used; the test result(s) obtained; and - if the repeatability has been checked, the final quoted result obtained. It shall also mention all operating d
8、etails not specified in this part of IS0 1841, or regarded as optional, together with details of any incidents which may have influenced the test result(s). The test report shall include all information necessary for the complete identification of the sample. Copyright International Organization for
9、 Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:06:45 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1841=2:1996(E) Annex A (informative) Bibliography I ISO3100-1:1991, Meat and meat p
10、roducts - Sampling and preparation of test samples - Part 7: Sampling. Z IS0 5725:1986, Precision of test methods - De- termination of repeatability and reproducibility for a standard test method by inter-laboratory tests (now withdrawn) was used to obtain the precision results. 3 Codex Alimentarius
11、 Committee FAO/WHO. Re- port of the 9th Session of the Codex Committee on Methods of Analysis and Sampling. Determi- nation of Total Chlorides, Potentiometric Method, 141 151 Appendix II. Food and Agricultural Organization of the United Nations, 1975, Rome, Italy. BRAMMELL, W.S., Collaborative study
12、 of a poten- tiometric titration method for determining sodium chloride in foods. J. Assoc. Off. Anal. Chem., 57, 1974, pp. 1209-I 216. BELJAARS, P.R and HORWITZ, W., Comparison of the Volhard and potentiometric methods for the determination of chloride in meat products: Col- laborative study. J. As
13、soc. Off. Anal. Chem., 68, 1985, pp. 480-484. 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:06:45 MDTNo reproduction or networking permitted without license from IHS -,-,-
14、 This page intentionally left blank Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:06:45 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1841=2:
15、1996(E) ICS 67.120.10 Descriptors: agricultural products, animal products, food products, meat, meat products, chemical analysis, determination of content, chlorides, potentiometric methods. Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:06:45 MDTNo reproduction or networking permitted without license from IHS -,-,-
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