Chapter 31: Problem 3

Write a protocol for analysing a sample of soil. After reading this chapter, prepare a detailed stepwise protocol explaining how to prepare the soil sample and analyse it by XRF. Ask another student to evaluate your protocol and provide you with written feedback - either simply by reading through your protocol, or by trying it out as part of a class exercise. (Check with a member of staff before you attempt this in a laboratory.)

Short Answer

Expert verified

To analyse a soil sample with XRF, collect the sample, air dry and grind it, perform the XRF analysis, interpret the results and ask for protocols evaluation and feedback.

Step by step solution

Collection of Soil Sample

Begin by collecting a soil sample from the area of interest. Use a clean, rust-free tool to dig about 6 inches into the soil. Put on a pair of gloves and place the soil into a clean, sterile plastic bag.

Soil Sample Preparation

For the preparation stage, begin by air drying the collected soil at room temperature. Once dried, use a mortar and pestle to grind the soil into a fine powder.

XRF Analysis

For the XRF analysis, switch on the XRF instrument and let it warm up according to instructions. Weigh the sample and place it into the sample cup, cover with a mylar film and secure the cup in the holder. Initiate the XRF analysis on the apparatus and wait for the results.

Interpretation of Results

Interpret the results that come from the XRF device. The output will typically show the percentage of various minerals and elements present in the soil sample. These should be recorded for future reference.

Evaluation and Feedback

Present the protocol for evaluation either by peer review or try-out. This is to verify the effectiveness of the procedure and to provide opportunities for improvement.

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Short Answer

Step by step solution

Collection of Soil Sample

Soil Sample Preparation

XRF Analysis

Interpretation of Results

Evaluation and Feedback

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