间接法测定工业废水中微量苯酚  

INDIRECT PHOTOMETRIC DETERMINATION OF PHENOL IN INDUSTRIAL WASTE WATER

作　　者：赵才[1] 

机构地区：[1]河北科技大学理学院,石家庄050018

出　　处：《理化检验（化学分册）》2004年第11期657-658,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究了用吸光光度法间接测定微量苯酚的方法。在KBrO3和KBr溶液中,以淀粉 碘化钾为显色剂,最大吸收波长为590nm,线性范围为0.10～2.00mg·L-1,回收率为92%～110%,NH+4、Ca2+、Fe3+等不干扰测定。该法用于测定工业废水中痕量苯酚,结果满意。Phenol in the sample is separated from some co-existing metal ions and phenylamine by distillation, and an appropriate aliquot of the distillate is taken for the photometric determination. In a dilute hydrochloric acid solution of 0.08mol·L^(-1), phenol is brominated by bromine which is liberated quantitatively by the raction of KBrO3 with bromide. The excess of bromine is reacted with iodide to give free iodine, which forms a blue colored complex with starch. The absorbance of the blue colored solution is measured at its λ(max) (590nm). The color intensity decreases with the increase of the concentration of phenol, and a linear relationship keeps in the range 0.10～2.00mg·L^(-1) of phenol. Recoveries from 92%～110% are obtained. In the analysis of waste water sample by this method, the results are satisfactory.

关 键 词：间接光度测定 苯酚 溴化 碘 淀粉显色 废水 

分 类 号：O657.32[理学—分析化学]