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ÖNORM EN 1233:1996-11

Действует
Water quality - Determination of chromium - Atomic absorption spectrometric methods
This European Standard specifies two methods for the determination of chromium in water by atomic absorption spectrometry. The two methods are covered in separate clauses as follows: Clause 3: Determination of chromium by flame atomic absorption spectrometry;
Clause 4: Determination of chromium by electrothermal atomization atomic absorption spectrometry.
Clause 3 is applicable to the analysis of water and waste water when the concentration range is between 0,5 mg/l and 20 mg/l of chromium. When the concentration is below 0,5 mg/l the determination can be carried out after carefully evaporating an acidified sample to small volume, taking care to avoid the formation of a precipitate.
WARNING: The use of evaporation will increase the effect of interfering substances and therefore for concentrations below 0,1 mg/l the method in clause 4 is given. Clause 4 is applicable to the analysis of water and waste water when the concentration range is between 5 ug/l and 100 ug/l of chromium by injecting a sample volume of 20 ul. It is applicable to the determination of higher concentrations by using a smaller sample volume.
Diese ÖNORM beschreibt zwei Verfahren für die Bestimmung von Chrom in Wasser mittels Atomabsorptions-Spektrometrie. Verfahren A behandelt die Bestimmung von Chrom mittels Flammen-Atomabsorptions-Spektrometrie, Verfahren B mittels AAS nach elektrothermischer Atomisierung (Graphitrohr- technik). Verfahren A ist für den Bereich zwischen 0,5 mg/l und 20 mg/l geeignet, Verfahren B für den Bereich von 5 mg/l bis 100 mg/l.
ICS
13.060.50 Examination of water for chemical substances / Исследование воды для определения содержания химических веществ