Measure the absorbance of the unknown sample using the AAS. Using the calibration curve , determir the concentration of nickel in the unknown sample by interpolating I its absorbance value. 4. Quality Control: It is essential to run blank solutions (deionized water)to check for any instrument drift. Run a known standard solution after the sample analysis to verify the accuracy of the results. 6. Results and Calculation: . The concentration of nickel in the unknown sample is determined by findin the correspon v ) concentration I from th calibration curve based on the recorded

To measure the absorbance of the unknown sample using Atomic Absorption Spectroscopy (AAS) and determine the concentration of nickel, follow these steps:<br /><br />1. **Measure the Absorbance of the Unknown Sample:**<br /> - Place the unknown sample in the AAS instrument.<br /> - Record the absorbance value.<br /><br />2. **Using the Calibration Curve:**<br /> - Refer to the calibration curve that was previously created using standard solutions of known nickel concentrations.<br /> - Locate the recorded absorbance value on the y-axis of the calibration curve.<br /> - Draw a horizontal line from this point to intersect the calibration curve.<br /> - From the point of intersection, draw a vertical line down to the x-axis to read the corresponding concentration of nickel.<br /><br />3. **Quality Control:**<br /> - **Blank Solution:** Run a blank solution (deionized water) before analyzing the unknown sample to check for any instrument drift. This helps to zero the instrument and ensure there are no baseline deviations.<br /> - **Standard Solution:** After analyzing the unknown sample, run a known standard solution to verify the accuracy of the results. This step ensures that the instrument is still functioning correctly and that the readings are accurate.<br /><br />4. **Results and Calculation:**<br /> - The concentration of nickel in the unknown sample is determined by finding the corresponding concentration from the calibration curve based on the recorded absorbance value.<br /><br />By following these steps, you can accurately determine the concentration of nickel in the unknown sample using AAS.