Document Type : Full research article

Authors

• Keivan Shayesteh ¹
• K. Karimi ²
• Nabiollah Sepehri ³
• Zohreh Mozafari ⁴

¹ گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

² PhD Student, Dept. of Chemical Engineering, Faculty of Engineering,University of Mohaghegh Ardabili, Ardabil, Iran

³ Expert in Charge of Chemical and Device Laboratories, Shiraz Water and Wastewater Company, Shiraz, Iran

⁴ Quality Monitoring and Control Director, Shiraz Water and Wastewater Company, Shiraz, Iran

Abstract

In water chlorination for removing pathogens, trihalomethanes (THMs) are among the significant carcinogenic by-products of drinking water chlorination. The conventional measurement means for these compounds is a GC device with an ECD detector (GC-ECD) or GC/MS. A GC-ECD or a GC/MS is utilized for analyzing THMs at the microgram per liter scale. Purchasing an ECD detector is not easy or cost-effective. This article introduces a new concentration method using the Head Space technique in a GC-FID device for measuring the concentration of THMs. In this method, four compounds, chloroform (CHCl3), di-bromochloromethane (CHClBr2), bromodichloromethane (CHCl2Br) and bromoform (CHBr3), are plotted on a 5-point calibration chart after being measured on a microgram per liter scale. This method, designed in a laboratory, can be used to measure concentrations and analyze data in the laboratories of water and wastewater, environment, petroleum and petrochemistry, etc. High accuracy of the method (µg/L) is the main feature of this method. Here, the design method and advantages of this method are presented with diagrams and tables.

Keywords

• Measurement accuracy
• Concentration method
• Water distribution network
• Head Space technique
• Electron Capture Detector (GC-ECD)