Water quality - Determination of alkyl mercury - Purge trap/gas chromatography-cold atomic fluorescence spectrometry - Warning: The derivatization reagents and standard substances used in the experiment are toxic compounds, and the reagent preparation and sample pre-treatment process should be carried out in a fume hood; Wear protective equipment as required during operation to avoid contact with skin and clothing. 1. Scope of application: This standard specifies the purge and trap/gas chromatography-cold atomic fluorescence spectrometry method for the determination of alkyl mercury in water. This standard is applicable to the determination of alkyl mercury (methyl mercury, ethyl mercury) in surface water, groundwater, domestic sewage, industrial wastewater, and seawater. When the sampling volume is 45 ml, the detection limits for both methyl and ethyl mercury methods are 0.02 ng/L, and the lower limit for determination is 0.08 ng/L. 2 Normative References: This standard references the following documents or their clauses. For undated references, their valid versions are applicable to this standard. HJ442 Technical Specification for Environmental Monitoring of Coastal Waters H/T 91 Technical Specification for Surface Water and Sewage Monitoring H/T 164 Technical Specification for Groundwater Environmental Monitoring 3 Method and Principle: After distillation, the alkyl mercury in the distillate is derived from sodium tetrapropylborate to generate volatile methyl propyl mercury and ethyl propyl mercury. After purging and trapping, thermal desorption, and gas chromatography separation, it is then high-temperature decomposed into mercury vapor and detected using a cold atomic fluorescence mercury analyzer. Qualitative analysis based on retention time and quantitative analysis using external standard method

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