Precision Estimates of AASHTO T267: Determination of Organic Content in Soils by Loss on Ignition (2010)

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20 APPENDIX A- INSTRUCTIONS AND DATA SHEET FOR AASHTO T267 ILS

21 Instructions to the Participants of the ILS for AASHTO T267,”Determination of  Organic Content in Soils by Loss on Ignition”   1. Each lab should have received total of 12 bottles (6 large, 3 medium, and 3 small bottles).  2.  The bottles have marked as the following:   a.  N‐Sand, D‐Sand, P‐Sand, H‐Sand  b.  N‐Silt, D‐Silt, P‐silt, H‐Silt  c.  N‐Clay, D‐Clay, P‐Clay, H‐Clay  3.  Thoroughly mix the content of each bottle by shaking the bottles well.  4.  Follow Section 4 of AASHTO T267 to take three 100‐g representative samples from each of the  medium and large bottles (D‐, P‐, and H‐ samples).  5.  Place the entire content of the N‐ samples and the 100‐g samples from D‐, P‐, and H‐ samples in  containers and dry them in an oven at 110 ± 5°C (230 ± 9°F) to constant mass. Remove the  samples from the oven, place them in a desiccator and allow them to cool. 6. Take three 20-g test specimens from the N-samples. Mark them according to the specimens’ names in the enclosed worksheet. 7. Take three 20-g test specimens from each of the 100-g mixtures. Mark them according to the specimens’ names in the enclosed worksheet. 8. Place the specimens into tared crucible or porcelain evaporating dishes and determine the mass to the nearest 0.01 g. 9. Follow the instructions in Section 5.2 and 5.3 of T267. 10. Record the weights before and after ignition in the data sheet provided. 11. Calculate the organic content of each specimen as a percentage of the mass of the oven- dried soil as explained in Section 6 of T267. 12. Record the percentage of organic matter to the nearest 0.01 percent in the provided data sheet. 13. Please send the data to AMRL through email: hazari@amrl.net

22 Data Sheet for Entering AASHTO T267 ILS Data