| 李文,汪楷健,杨守波,林立慧,罗学科.基于超声-ORP原理的快速COD检测法研究[J].,2015,34(5):398-404 |
| 基于超声-ORP原理的快速COD检测法研究 |
| Rapid COD detection method based on ultrasound assisted sample digestion and titration with ORP monitored |
| 投稿时间：2015-03-18 修订日期：2015-08-26 |
| 中文摘要: |
| 针对传统水质化学需氧量(COD)在线检测方法检测稳定性差、易受环境影响等缺陷,为提高水质COD在线检测效率和稳定性,本文基于超声化学原理和氧化还原电位法(ORP),提出一种在超声波辅助消解(UASD)作用下基于ORP法的COD检测方法：UASD-ORP法。通过超声波辐照下空化气泡微射流的加强传质、表面自由基活化等特效作用消解待测水样,结合ORP监测溶液的宏观氧化-还原性,保证COD检测中后续滴定过程的准确性、稳定性。实验表明,经该方法检测标准邻苯二甲酸氢钾(KHP)溶液的COD值同国标法测得的COD值非常接近,相对误差在-6.0%~-3.0%之间；对污水样品实地测试中,该方法测得的COD值与标准方法测得的COD值的准确度在-10%~-1.5%之间。应用UASD-ORP法完成COD检测周期在15min~20min,且测量值重复性≤3%。实验验证了该方法具有可行性,可以用于开发在线检测技术。 |
| 英文摘要: |
| The detection results of the Chemical Oxygen Demand(COD) get from traditional detection method is widely inaccurate, unstable, and easily affected by the environment. In order to improve theSefficiency and theSstability of COD online detection results, this paper proposes a new method of COD detection method: UASD-ORP method based on ORP method which is assisted with the method ofSultrasonic wave assistedSdigestionS(UASD) method. It is based on theSprinciple ofSultrasonicSchemistrySand redox potentialS(ORP) method. Through the strengtheningSmass transfer of cavitation bubble’sSmicro jet under the irradiation of ultrasonic, surface free radical activation and other effects to digest the water sample, combined with the macroscopicSoxidation-reduction character of ORP monitoringSsolution, it contributed to the accuracy,Sstability of CODSdetectionSin the subsequentStitrationSprocess. Experiments show that the measured COD value of the standard KHP solution by that method is very close to the value by the national standard method and the relative errorSis between in the -6.0% ~ -3.0%; the accuracy of the measured COD value by the mentioned method above and the value by the standard method in practical detection applicationSofSwaste waterSsamples is between -10.0% to -1.5%.The process of COD detection in the use of UASD-ORP method is between 15min and 20min and the repeatability error Sis ≤3%.The experiments show that the method is significant,and can used to develop COD online determination technology. |
| DOI： |
| 中文关键词: COD检测 超声辅助消解 ORP监测滴定法 |
| 英文关键词: COD determination ultrasonic assisted digestion titration based on ORP |
| 基金项目: |
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