ISO 16968:2015 pdf download

ISO 16968:2015 pdf download.Solid biofuels — Determination of minor elements
1 Scope
This International Standard is intended for the determination of the minor elements Arsenic, Cadmium, Cobalt, Chromium, Copper, Mercury, Manganese, Molybdenum, Nickel, Lead, Antimony, Vanadium, and Zinc in all solid biofuels. Further, it describes methods for sample decomposition and suggests suitable instrumental methods for the determination of the elements of interest in the digests. The determination of other elements such as Selenium, Tin, and Thallium is also possible with the method described in this International Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11885, Water quality — Determination of selected elements by inductively coupled plasma optical emission spectrometry (ICP-OES)
ISO 16559, Solid biofuels — Terminology, definitions and descriptions
ISO 16993, Solid biofuels — Conversion of analytical results from one basis to another
ISO 17294-2, Water quality — Application of inductively coupled plasma mass spectrometry (ICP-MS) —Part 2: Determination of 62 elements
ISO 17378-2:2014, Water quality — Determination of arsenic and antimony — Part 2: Method using hydride generation atomic absorption spectrometry (HG-AAS)
ISO 18134-3 1) , Solid biofuels — Determination of moisture content — Oven dry method — Part 3: Moisture in general analysis simple
EN 14780, Solid Biofuels — Sample preparation
EN 12338, Water quality — Determination of mercury — Enrichment methods by amalgamation
8 Preparation of the test sample
The test sample is the general analysis test sample with a nominal top size of 1 mm or less, prepared in accordance with EN 14780. For the milling of the sample, special attention shall be taken to the risk of contamination from the inner materials of the mill. These materials shall be chosen depending on the elements to be determined. If, for example, chromium and nickel have to be determined with a high accuracy at low levels, stainless steel materials should be avoided for the parts of the mill having contact with the sample, using, for example, tungsten carbide or titanium instead. Due to the higher abrasion rate, the use of high-speed mills should in general be avoided. The results are to be calculated on a dry basis. Therefore, the moisture content of the test sample shall be determined as described in ISO 18134-3.