ISO 15587-2:2002

Standard
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Norwegian title: Water quality — Digestion for the determination of selected elements in water — Part 2: Nitric acid digestion
English title: Water quality — Digestion for the determination of selected elements in water — Part 2: Nitric acid digestion
Item type: Standard
Language: Engelsk
Edition: 1 (2002-02-26)
Number of pages: 17
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Scope: <p>This part of <std std-id="iso:std:iso:15587:en" type="undated"><std-ref>ISO 15587</std-ref></std> specifies a method for extracting trace elements from a water sample using nitric acid as a digestion agent. The method is applicable to all types of waters with a suspended solids concentration of less than 20 g/l and a total organic carbon (TOC) concentration expressed as carbon of less than 5 g/l.</p><p>The nitric acid digestion method is empirical and it might not necessarily release elements completely. However, for most environmental applications the result is fit for purpose.</p><p>Nitric acid digestion is suitable for the release of: Al*, As, B, Ba*, Be*, Ca, Cd, Co, Cr*, Cu, Fe*, Hg, K, Mg*, Mn, Mo, Na, Ni, P, Pb, Se, Sr, Tl, V*, Zn (asterisk indicates a possible lower recovery compared to <italic>aqua regia</italic> digestion method specified in <std std-id="iso:std:iso:15587:-1:en" type="undated"><std-ref>ISO 15587-1</std-ref>, see <xref ref-type="bibr" rid="biblref_1">reference [1]</xref></std>). It is suitable for the release of Ag only if the sample is stabilized immediately after digestion. Nitric acid digestion is not suitable for Sb, Sn and for the digestion of refractory compounds such as SiO<sub>2</sub>, TiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>.</p><p>The method is generic and may be implemented using a wide variety of equipment provided</p><list list-type="bullet"><list-item><label>—</label><p>the digestion composition is unchanged,</p></list-item><list-item><label>—</label><p>the digestion temperature is known, and</p></list-item><list-item><label>—</label><p>the digestion duration is in accordance with this temperature.</p></list-item></list>
Adopted: 2002-02-26
ICS: 13.060.50 - Undersøkelse av kjemikaler i vann