Preparing Sample (IMAGE) American Society of Agronomy Caption Lab technician, Erin Silva, prepares a sample for titration with hydrochloric acid to determine the amount of carbon dioxide (CO2) released by soil during incubation, as part of soil-test biological activity to predict soil nitrogen mineralization. Credit Alan Franzluebbers Usage Restrictions For use with story only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.