What is the best way to digest Aluminum from Calcium oxide

[KtinaN904]

Homework Statement

I am attempting to find Alppm from a calcium oxide sample by spectrophotometry.

Homework Equations

The Attempt at a Solution

I’ve used conc. HCl and heated to dryness, then added 50/50 HCl and reheated. I then filtered the solution and corrected the pH. I’ve followed the HACH method but I’m only seeming to get a 40% recovery using NIST standards.

 

[nate808]

Hello,

Thank you for sharing your approach to finding Alppm from a calcium oxide sample using spectrophotometry. It seems like you have followed the HACH method and have used NIST standards for comparison. However, it is important to note that the recovery percentage may vary depending on the accuracy and precision of your instrument and technique.

One suggestion I have is to double check the calibration of your instrument and make sure that all the necessary corrections have been made. It may also be helpful to run multiple replicates of your sample and take the average to improve the accuracy of your results.

Additionally, you may want to consider using a different method for determining Alppm, such as atomic absorption spectroscopy or inductively coupled plasma mass spectrometry, as they may provide more accurate results.

I hope this helps and good luck with your analysis!