Full of useful information! Did you get the special session on new drinking water hygiene standards for disinfection by-products and element indicators?

On the afternoon of June 9th, the [Interpretation of the new standard for drinking water GB 5749 - Special session on disinfection by-products and element indicators co-sponsored by Tongju Media, Environmental Protection Online, and PerkinElmer 】The online live broadcast forum started on time. From researchers Zhang Lan, director of the Water Quality and Health Monitoring Office of the Institute of Disease Control and Prevention, Liu Li, technical supporter of ICP-MS for PerkinElmer’s inorganic production line, and Ma Jiping, deputy director of the School of Environmental and Municipal Engineering of Qingdao University of Technology, director of the campus analysis and testing center Participated in this online forum and provided relevant interpretations of the content of the new GB 5749 standard. The whole live broadcast was exciting and full of useful information. What rich content did the experts share? Come and follow the editor to review it!

Click on the picture or scan the QR code to review the live broadcast

"Disinfection by-products in drinking water Control Requirements and Detection Technology"

Researcher Zhang Lan, Director of the Water Quality and Health Monitoring Office of the China Institute of Disease Control and Prevention, gave a speech titled "Control Requirements and Detection Technology for Disinfection By-Products in Drinking Water" The report introduced the significance and methods of disinfection of drinking water, the control requirements for disinfection by-products, and the detection methods of disinfection by-products.

Researcher Zhang Lan introduced that the new standards have gradually strengthened the control requirements for disinfection by-products, which is reflected in: the transition from pure biological risk control Pay equal attention to biological risk control and chemical risk control (lowering the high limit of residual chlorine); implement sanitary license management for disinfectants and disinfection equipment; also include trihalomethanes and haloacetic acids into routine indicators, and increase chlorine for subsodium disinfection The requirements for acid salt detection have been refined, and the requirements for the determination of by-products of compound chlorine dioxide have been refined; the new standard also added new DBPs such as NDMA and iodoacetic acid to the appendix.

For the detection method of halogenated hydrocarbons, one of the disinfection by-products, the new standard adds headspace capillary column gas chromatography method-ECD detector and purge and trap gas chromatography mass spectrometry to the original basis. Researcher Zhang Lan introduced the detection methods and precautions in detail;

For the detection of haloacetic acid, the new standard adds ion chromatography-conductivity on the basis of liquid-liquid extraction derivatization gas chromatography. Two methods: detector and high performance liquid chromatography tandem mass spectrometry;

The new standard for the detection of p-chlorophenol is based on the original derivative gas chromatography ECD detector and SPME gas chromatography-ECD On the basis of the detector, SPE GC chromatography is added.

Finally, regarding the development trend of disinfection by-product detection methods, researcher Zhang Lan believes that disinfection by-product detection methods are moving towards high-throughput, high-sensitivity, combined with mass spectrometry and pre-treatment technology. As well as the development in the direction of automation and green environmental protection.

　《Application of ICP-MS Technology in Analysis of Total Elements and Speciation in Water Quality》

　PerkinElmer Inorganic Production Line ICP- MS technical support Liu Li introduced the application of ICP-MS technology in water quality testing. Liu Li started from the changes in GB 5749 and GB 5750 and introduced the updated content of GB5749 compared with the old version. The water quality indicators of the new standard have been adjusted by 106 items. There are 97 items, and the water quality reference indicators have increased from 28 to 55. Liu Li then introduced PerkinElmer's unique solutions for ICP-MS technology in analyzing the total amount and form of elements in water quality, such as intelligent electronic dilution technology. Subsequently, Liu Li introduced the biggest change in elemental analysis of GB 5750 - the addition of elemental form analysis methods. PerkinElmer also has a wealth of solutions in elemental form analysis. NexION series ICP-MS provides extraordinary stability, excellent anti-interference performance and excellent acquisition speed; comprehensive HPLC/GC ICP-MS solutions to meet the challenges of various elemental form analysis; integrated workstation, software is easy to use, functional Powerful and easy to implement daily detection of morphological analysis.

"Analysis of water quality sample pretreatment technology in GB 5749-2022"< br />

Ma Jiping, deputy dean of the School of Environmental and Municipal Engineering of Qingdao University of Technology and director of the school's analysis and testing center, mainly introduced the new GB 5749The standard covers water quality sample pre-treatment technology for heavy metals, organic matter and speciation analysis, focusing on sample pre-treatment technology for the determination of organic matter such as disinfection by-products in water. Director Ma’s report was detailed and full of knowledge. The editor summarized the key points as follows:

Sample pretreatment technology for volatile organic compounds analysis in water↑

Sample pretreatment technology for the analysis of semi-volatile and non-volatile organic compounds in water↑

Subsequently, Director Ma introduced respectively It provides sample pretreatment technology for the determination of volatile organic compounds such as disinfection by-products in water (volatile halogenated hydrocarbons, nitrosamines, odor substances), and sample pretreatment technology for the determination of different forms of metals in water (methylmercury and ethylmercury). , sample pretreatment technology for the determination of new pollutants in water (perfluorinated compounds, PPCPs, pesticides) and other details.

Three experts delivered a detailed interpretation of the new standards through live broadcast. The two-hour time was so short but yet rewarding. Friends who missed the live broadcast, please click on the live broadcast link to review it!