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本文选取固氮蓝藻分离富集Cr(Ⅵ)/Cr(Ⅲ),用石墨炉原子吸收光谱法测定。结果表明该方法对10mL试样,测定Cr(Ⅵ)的检测限为0.1μg·L-1、变异系数为3.2%,在0—45μg·L-1范围内线性关系好;测定Cr(Ⅲ)的检测限为0.3μg·L-1、变异系数3.7%,在0—40μg·L-1范围内线性关系好。方法选择性高、富集率高。测定矿泉水、海水及自来水中的铬,获得满意结果。
In this paper, the separation and enrichment of Cr (Ⅵ) / Cr (Ⅲ) by nitrogen fixation cyanobacteria were studied by graphite furnace atomic absorption spectrometry. The results showed that the detection limit of Cr (Ⅵ) for 10 mL sample was 0.1 μg · L-1 with a coefficient of variation of 3.2% and the linearity was good in the range of 0-45 μg · L-1. Cr The detection limit of (Ⅲ) was 0.3μg · L-1, with a coefficient of variation of 3.7%. The linearity was good in the range of 0-40μg · L-1. The method has high selectivity and high enrichment rate. Determination of mineral water, seawater and tap water chromium, satisfactory results.