BAIJIAN - Third party testing organization
This standard specifies the determination of suspended solids in water. 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 4.1 Commonly used 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 nozzle deterrence. 5 Sampling and sample storage. 5.1 Sampling.
The polyethylene or hard glass bottles used 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 considered suspended substances and should be removed from the water sample5.2 Sample Storage
The collected water samples 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 stateStep 6
Preparation of 6-1 Filter Membrane
Use a flat pointed toothless wrench to clamp the microporous filter membrane and place it in a pre weighed weighing bottle. Transfer it to an oven and dry 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
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