Drinking water (parameter) detection

Trichloromethane is the same as the test method for carbon tetrachloride in Chapter 1 of GB/T 5750.8-2006. 2. Tribromomethane is the same as the inspection method for carbon tetrachloride in Chapter 1 of GB/T5750.8-2006. 3 Dichlorobromomethane is the same as the test method for carbon tetrachloride in Chapter 1 of GB/T 5750.8-2006. 4-Chlorodioxane is the same as the test method for carbon tetrachloride in Chapter 1 of GB/T5750.8-2006. 5 Dichloromethane 5.1 Scope of headspace gas chromatography 5.1.1 This standard specifies the use of headspace gas chromatography for the determination of dichloromethane, 1,1-dichloroethane, and 1,2-dichloroethane in drinking water and its source water. This method is applicable to the determination of dichloromethane, 1,1-dichloroethane, and 1,2-dichloroethane in drinking water and its source water. The minimum detection mass concentration for this method is 9 ug/L of dichloromethane, 8 ug/L of 1,1-dichloroethane, and 13 ug/L of 1,2-dichloroethane. Under the operating conditions of this method, other halogenated compounds do not interfere. 5.1.2 Principle: In a sealed headspace bottle, volatile halogenated molecules escape from the liquid phase into the gas in the upper space of the liquid surface. At a certain temperature, the halogenated molecules reach dynamic equilibrium between the gas and liquid phases. At this time, the concentration of halogenated molecules in the gas phase is proportional to its concentration in the liquid phase. By measuring the concentration of halogenated molecules in the gas phase, the mass concentration of halogenated molecules in the water sample can be calculated. 5.1.3 Reagents and materials 5.1.3.1 Carrier gas and auxiliary gas 5.1.3.1.1 Carrier gas: high-purity nitrogen (99.999%). 5.1.3.1.2 Gas: Pure hydrogen (> 99.6%). 5.1.3.1.3 Auxiliary gas: Oil free compressed air, purified through a purification tube containing 0.5 nm molecular sieve. 5.1.3.2 Reagents used in the preparation of standard samples and reagents 5.1.3.2.1 Pure water (fresh deionized water). 5.1.3.2.2 Chromatographic standard substances (chromatographically pure): dichloromethane, 1,1-dichloroethane, and 1,2-dichloroethane. 5.1.3.3 Reagents and materials used for preparing chromatographic columns 5.1.3.3.1 Chromatographic columns and fillers can be found in 5.1.4.1.3. 5.1.3.3.2 Solvent used for coating the fixing solution: trichloromethane+butanol (1:1). 5.1.4 Instrument 5.1.4.1 Gas chromatograph

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms

3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

BAIJIAN testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Our Competitive Edge:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

4. Free initial testing, with no testing fees charged

5. Self service order delivery for free on-site sampling

6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China