Methods for chemical analysis of aluminium and aluminium alloys—Part 18:Determination of chromium content
全国有色金属标准化技术委员会(SAC/TC 243)
GB/T 20975的本部分规定了萃取分离-二苯基碳酰二肼分光光度法、火焰原子吸收光谱法、过硫酸铵氧化-硫酸亚铁铵滴定法测定铝及铝合金中铬含量，水浸取-二苯基碳酰二肼分光光度法测定铝及铝合金中六价铬含量。
本部分适用于铝及铝合金中铬含量和铝及铝合金中六价铬含量的仲裁测定。萃取分离-二苯基碳酰二肼分光光度法测定铬测定范围:0.000 1%～0.60%；火焰原子吸收光谱法测定铬测定范围:0.010%～0.60%；过硫酸铵氧化-硫酸亚铁铵滴定法测定铬测定范围:2.00%～23.00%；水浸取-二苯基碳酰二肼分光光度法测定六价铬测定范围:0.000 1%～0.10%。
注: 铬质量分数为0.010%～0.60%时，采用萃取分离-二苯基碳酰二肼分光光度法为仲裁方法。
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