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1、INTERNATIONAL STANDARD IS0 8819 Second edition 1993-l o-01 ANSI 1ntemnt Il)ctc see Liquefied petroleum gases - Detection of hydrogen sulfide - Lead acetate method Gaz de p b) if initially there was a distinct yellow coloration that is no longer present after 5 min, report methyl mercaptan present. N
2、OTE 4 In the case of pass-fail data or results from other qualitative tests, no generally accepted method for deter- mining precision is currently available. 6 Test report The test report shall contain at least the following in- formation: a) sufficient details for complete identification of the pro
3、duct tested; b) a reference to this International Standard; c) the result of the test; d) any deviation, by agreement or otherwise, from the procedure specified; e) the date of the test. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Tec
4、hnical Standards 1/9972545001 Not for Resale, 04/27/2007 03:56:44 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8819:1993(E) Annex A (informative) Use of sample cylinders Because of the chemical activity and physical adsorp- tive properties of hydrogen sulfide, it is
5、highly desira- ble to connect the test apparatus directly to the sample source and perform the test on site, rather than transferring sample into a sample cylinder for testing in the laboratory. Experience has demonstrated that the hydrogen sul- fide concentration in liquefied petroleum gas samples
6、collected in scrupulously clean sample cylinders is depleted even though the cylinder is made of stain- less steel. The exact opposite, an increase in hydro- gen sulfide concentration, has been found when samples of liquefied petroleum gas containing no hy- drogen sulfide are transferred into sample
7、 cylinders that have not been properly cleaned and have been in use with samples containing hydrogen sulfide. This indicates that data obtained on samples tested for hydrogen sulfide in the laboratory are unreliable. 4 Copyright International Organization for Standardization Provided by IHS under li
8、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 03:56:44 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8819:1993(E) UDC 665.725:543.272.55 Descriptors: petroleum products, liquefied petroleum gases, chemical analysis, detection, hydrogen sulphide. 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, 04/27/2007 03:56:44 MDTNo reproduction or networking permitted without license from IHS -,-,-