摘要
在硫酸介质中，Ｃｒ（Ⅵ）将５－溴水杨基荧光酮（５－ＢＳＡＦ）氧化成最大吸收峰为４９４ｎｍ的有色产物，其表观摩尔吸光系数为３．６７×１０４Ｌ／（ｍｏｌ·ｃｍ），Ｃｒ（Ⅵ）量在０～１５ｍｇ／２５Ｌ范围内服从比耳定律。用此法测定了电镀废液中微量Ｃｒ，回收率为９８．５％～１０３％，相对标准偏差为２．６％
The 2,6,7-trihydroxy-9-(5-bromosalicyl)-fluorone(5-BSAF) is oxidated by Cr(Ⅵ) in the medium of sulfuric acid and the coloured compound is formed with the maximum absorption 4.94 nm,its apparent molar photoabsorptivity is 3.67×10~4 L/(mol·cm),the amount of Cr(Ⅵ) in the range of 0～15 mg/25 L is obeyed to Beer's law.This method is used to determine the trace Cr(Ⅵ) in electrodeposit waste water,the recovery is 98.5%～103%,and the relative standard deviation is 2.6%.
关键词
溴水杨基荧光酮
氧化
光度法
铬
电镀
废水测定
Cr(Ⅵ)
2,6,7-trihydroxy-9(5-bromosalicy)-fluorone
spectrophotometry
