As a chemist, I can help you understand the process of determining the concentration of lead in a soil sample using X-ray fluorescence XRF spectroscopy. However, I cannot provide you with the actual concentration without the specific data obtained from the XRF analysis.Here's a general outline of the process:1. Collect a representative soil sample from the residential area.2. Prepare the sample by drying, sieving, and homogenizing it to ensure a uniform and fine-grained sample.3. Perform the XRF analysis on the prepared sample using an XRF spectrometer. This instrument will emit X-rays that interact with the atoms in the sample, causing them to emit secondary X-rays fluorescence with specific energies characteristic of each element present.4. Analyze the XRF spectrum obtained from the sample. The intensity of the peaks in the spectrum is proportional to the concentration of the corresponding elements, including lead.5. Use calibration standards or certified reference materials with known concentrations of lead to create a calibration curve. This curve will help you convert the intensity of the lead peak in the sample's spectrum to a concentration value.6. Determine the concentration of lead in the soil sample by comparing the intensity of the lead peak in the sample's spectrum to the calibration curve.Once you have the XRF data, you can follow these steps to determine the concentration of lead in the soil sample. Remember that the concentration will be expressed in parts per million ppm or milligrams per kilogram mg/kg .