ISO 9174-1998 水质 铬的测定 原子吸收光谱法

标准号：ISO 9174-1998
中文标准名称：水质 铬的测定 原子吸收光谱法
英文标准名称：Water quality - Determination of chromium - Atomic absorption spectrometric methods
标准类型：P40
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：P40
国际标准分类号：13.060.50
适用范围：This International 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. NOTE 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 μg/l and 100μg/l of chromium by injecting a sample volume of 20 μl It is applicable to the determination of higher concentrations by using a smaller sample volume.