Soil Composition Comparisons using XRD and XRF Data - Bailey Foster скачать в хорошем качестве

Soil Composition Comparisons using XRD and XRF Data - Bailey Foster

Comparing compositions of soil gathered from my families' backyards and using X-Ray Diffraction and X-Ray Fluorescence data. This was a final project for my Analytical Geology class. X-Ray Diffraction is used to analyze and identify the composition of minerals, compounds, etc. In this case, I had ground up the soil into a very find powder and made disks out of the ground dirt to be put into the machine. The machine then sends out x-rays directed at the sample for a period of time (30 sec to 1 hr on our machine) and the diffracted rays are collected on an x-ray sensor. The data is represented as peaks on a graph, and with those peaks, we search through a database of known minerals and compounds and find which one fits our peaks the best. X-Ray Fluorescence, on the other hand, determines the elements that make up the substance. We go through the same process of grinding up the dirt and make an actual puck out of it, with a binding agent and hydraulic press. We put the puck into the machine for another set amount of time, and it sends out high radiation that excites the atoms within the substance. This excitement shoots out electrons from the inner most orbitals and XRF radiation is emitted. We get back a spreadsheet with the concentration of elements in percentages. With all the data combined, I made some conclusions of what could have been in the soil (like pesticides or possible minerals that could have been eroded away). If you have any questions about this project or anything geology related, feel free to comment! Thank you so much!