期刊论文

中文

分析科学学报

1006-6144

2007

23

5

598-600

10.3969/j.issn.1006-6144.2007.05.027

(2003C15):衡阳师范学院校科研和教改项目

本校为第一机构

研究了在表面活性剂吐温-80存在下,镧(Ⅲ)与4,5-二溴邻硝基苯基荧光酮(DBONPF)的高灵敏显色反应,并建立了测定镧(Ⅲ)的新方法.实验发现,在pH=10.3 NH4Cl-NH3缓冲溶液中,镧(Ⅲ)与4,5-二溴邻硝基苯基荧光酮形成紫色络合物,络合物的最大吸收波长为594.0 nm,表观摩尔吸光系数ε=2.31×105 L\5mol-1\5cm-1.镧(Ⅲ)的浓度在0～35 μg/25mL的范围内符合比耳定律.本法用于铜合金试样中微量镧的测定,结果令人满意.

In the presence of surfactant tween-80, the photometric properties of color reaction of 4,5-Dibromo-2-nitro-phenylfuorone （DBONPF） with La（ Ⅲ ） were studied. Based on this fact, a new method was established for the determination of La（ Ⅲ）. The experimental results showed that La（ Ⅲ） reacted with DBONPF to form a micelle complex with a maximum absorption at 594.0 nm in a pH 10.3 NH4Cl- NH3 buffer solution. The apparent molar absorptivity of the complex was 2.31 × 10^5 L. mol^-1 . cm^-1. Beer＇s law was obeyed in the range of 0-35 μg...