BAIJIAN - Third party testing organization
This standard specifies the method for determining the water content of surfactants. Products with a moisture content (mass fraction) greater than 5% in powder、 slurry、 and liquid form can be distilled using xylene azeotropic distillation. However、 the azeotropic distillation method is not applicable to products containing water-soluble volatiles、 such as those containing ethanol. The Karl Fischer method is an acceptable method for powder、 slurry、 and liquid products with a moisture content (mass fraction) less than 1%. However、 the sample contains alkaline compounds such as silicates、 carbonates、 hydroxides、 and selenates、 which will affect the measured values. Therefore、 the alkaline compounds in the sample should be analyzed before measurement. 2 Normative References: The clauses in the following documents become standard clauses through reference in this standard. For dated reference documents、 all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However、 it is encouraged to reach agreements based on this standard and all parties to study whether new versions of these documents can be used. For undated references、 the latest version of * applies to this standard. GB/T 6372 Surfactants and Detergents、 Sample Separation Methods (GB/T 6372-2006、 ISO 6071980、 IDT) GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-1992、 neq ISO 36961987) 3 Terms and Definitions The following terms and definitions apply to this standard. The amount of free water、 crystalline water、 adsorbed water、 or retained water in the sample is calculated based on the amount of Karl Fischer reagent used and expressed as a mass fraction. Principle 4.1 The water in the Karl Fischer method sample reacts with iodine and sulfur dioxide in the Karl Fischer reagent、 and the Karl Fischer reagent is calibrated with an accurately known amount of water by titration in advance. Calculate the mass fraction of water content based on the amount of reagent used. HzO+I+SO:+3CH、 N → 2C HsN - HI+CH N - so、 HgN - so、+CH、 OH → C、 H、 NH - OSo、 OCH、 4.2 azeotropic distillation method: The water in the sample is azeotropically distilled with boiling xylene or petroleum、 and the water content is expressed as a mass fraction. 5 Reagents and materials 5.1 Distilled water: Grade II water specified in GB/T6682; 5.2 Anhydrous methanol: analytically pure; 5.3 Karl Fischer reagent; Note: If applicable、 pyridine free reagents can be used (indicated in the test report). 5.3.1 Karl Fischer reagent containing pyridine; 5.3.2 Karl Fischer reagent without pyridine; 5.4 Sodium tartrate or oxalic acid: analytically pure
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 problemsinspection and 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 requiredTesting and testing characteristics:
1. The testing industry is fully covered、 meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. 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