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After the sample container and its contents have equilibrated to laboratory temperature, between 21 to 32 degrees Celsius, 70 to 90 degrees Fahrenheit. agitate the full sample by hand or preferably by a mechanical shaker, for 10 minutes to ensure homogeneity. As soon as possible to prevent losing any water or sediment by settling, fill the centrifuge tube to the 100-mL mark directly from the sample container. Stopper and place in a trunnion cup in the centrifuge. Prepare a second centrifuge tube to the same mass as the centrifuge tube, in 8.2 of the written standard, and place in the trunnion cup opposite the first tube, to establish a balanced condition. It is practical to fill the second tube with another portion of the sample being evaluated. This practice gives a second tube of consistent mass to the first tube, and allows the sample to be analyzed in duplicate. Close the centrifuge cover. Turn on the centrifuge for 10 minutes, at a speed sufficient to produce a relative centrifugal force (rcf), of 800, plus or minus 60 at the tip of the whirling tubes. For the relationship between diameter of swing, rcf, and rpm, see Table 1 of the written standard. When the centrifuge has stopped moving, after the 10-minute spin, remove the centrifuge tube. Estimate and record the combined water and sediment volume at the bottom of the tube to the nearest 0.005 mL. Since a 100-mL sample is used, the volume of water and sediment in milliliters is numerically the same as percent by volume.

Video Details

Duration: 2 minutes
Language: English
License: Dotsub - Standard License
Genre: None
Views: 6
Posted by: abuckmaster on Jul 18, 2019


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