水中甲醛的动力学分光光度测定法  

Determination of Formaldehyde in Water Sample by Kinetic Spectrophotometry

作　　者：陈宁生[1] 张磊[1] 尹鹏程[1] 

机构地区：[1]安徽工程科技学院生化工程系,安徽合肥241000

出　　处：《环境与健康杂志》2005年第3期215-216,共2页Journal of Environment and Health

基　　金：安徽省科技厅资助项目;安徽省教育厅自然科学基金资助项目(2004KJ043)

摘　　要：目的研究水中甲醛的动力学分光光度测定法。方法在磷酸介质中,微量甲醛对溴酸钾氧化甲基橙褪色有显著的催化作用,用分光光度法测定反应速度与其量的变化关系,从而测定甲醛的含量。结果该方法的线性范围为0.13～3.00μg/ml,检出限为4.7×10-5mg/ml,相对标准偏差为1.5%～3.3%,回收率为97.3～102.0%。结论该方法简便、快速,灵敏度较高,可用于水样中微量甲醛的测定。Objective To establish a new kinetic spectrophotometry for determination of formaldehyde in water sample. Methods Micro formaldehyde could sensitively catalyze the discoloring reaction of methyl orange oxidized by potassium bromated in dilute H3PO4 medium, the relationship between the reaction speed and the content of formaldehyde could be determinated by spectrophotometry, then the content of formaldehyde could be determinated. Results The optimum condition and kinetic paramneters were investigated and showed in the present paper in detail. The calibration curve showed linearity in the range of 0.13-3.0 μg/ml and the limit of detection was 4.7×10-5 mg/ml. The RSDs ranged from 1.5% to 3.3%.The recovery rates ranged from 97.3% to 102.0%. Conclusion The mothed was simple, rapid and more sensitive, can be used for the determination of micro amounts of formaldehyde in water sample with satisfied results.

关 键 词：水 甲醛 分光光度法 

分 类 号：O657.3[理学—分析化学]