BAIJIAN - Third party testing organization
This standard specifies the determination of suspended solids in water、 including the subject matter and scope of application. This standard is applicable to surface water、 groundwater、 as well as the determination of suspended solids in domestic sewage and industrial wastewater
2 Definition: Suspended solids in water quality refer to ancient substances that are retained on a filter membrane with a pore size of 0.45 um and dried to constant weight at 103-105 ℃. 3 reagents distilled water or water of equivalent purity. 4. Equipment 4.1 Common laboratory instruments and the following instruments. 4-2 all glass microporous membrane filters. 4.3CN-CA filter membrane with a pore size of 0.45 um and a diameter of 60 mm. 4.4 suction bottle and vacuum pump. 4.5 Toothless flat nose deterrents. 5 Sampling and sample storage. 5.1 Polyethylene bottles or hard glass bottles used for sampling should be washed with detergent. Rinse thoroughly with tap water and distilled water in sequence. Before sampling、 rinse the water sample that will be collected three times. Then、 collect 500-1000 mL of representative water samples and tightly cap the bottle. Note: Floating or submerged non-uniform solid substances are not suspended substances and should be removed from the water sample. 5.2 Water samples collected during sample storage should be analyzed and determined as soon as possible. If it needs to be stored、 it should be stored in a 4 ℃ refrigerated box、 but the length should not exceed seven days. Note. Do not add any protective agents to prevent damaging the distribution balance of substances in the solid and odorous state. Step 6-1 Preparation of Filter Membrane: Use a flat mouthed toothless giant to clamp the microporous filter membrane and place it in a weighing bottle of constant weight. Transfer it to an oven and dry it at 103-105 ℃ for half an hour. Then、 take it out and cool it to room temperature in a dryer、 and weigh it. Repeat drying、 cooling、 and weighing until the weight difference between the two weighings is ≤ 0.2 mg. Place the constant weight microporous filter membrane correctly on the membrane tray of the membrane filter (4.1)、 cover it with a matching funnel、 and fix it with a clamp. Wet the membrane with distilled water and continuously absorb the filter
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