When answering this question, focus on a specific challenging analytical problem you faced in your previous work or academic experience. Describe the context and the nature of the problem in detail. Explain the steps you took to analyze the problem, the methods and tools you used, and how you applied your knowledge of chemistry to find a solution. Highlight any innovative approaches or techniques you employed. Conclude with the outcome and what you learned from the experience. For example:
"In my previous role, I encountered a situation where the standard method for determining the concentration of a particular element in a sample was yielding inconsistent results. I first verified the calibration of the instruments and then reviewed the entire analytical procedure. I discovered that the sample preparation process was introducing contaminants. By modifying the sample preparation protocol and implementing a new purification step, I was able to obtain consistent and accurate results. This experience taught me the importance of thorough method validation and the need to be adaptable in problem-solving."
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