【摘要】 本文拟定了以二安替比林苯乙烯甲烷为显色剂,光度法测定微量铬的方法,显色剂在1.8mol/L磷酸介质中与铬（Ⅵ）生成紫红色络合物,λ_max=540nm,ε₅₄₀=3.77×10⁴,铬含量在0.5—5.5μg,25mL范围内符合比尔定律,常见离子不产生干扰,可用于电镀废水中铬（Ⅵ）和总铬量的测定以及钢铁试样中测定铬。更多还原

【Abstract】 s The determination of micro amounts of chromium (Ⅵ) with diantipyrylstyrylmethane has been investigated. The coloration reaction is high sensitive and selective. Diantipyrylstyrylmethane reacts with chromium(Ⅵ) ions in 1.80 mol/L phosphoric acid medium to form violetred cornplex. The maximum absorption is at 540 nm. The molar absorptivity of the complex is 3.7×10~4. Beer s law is obeyed within theconcentration range of 0.5—5.5μg Cr/25mL.The effects of foreign ions on the determination of chromium (Ⅵ) have been investigated. The method is applicable to determination of chromium(Ⅵ) and total chromium in waste water and steels.更多还原