Question
E.g. You did analysis of Cu content in freshwater sediment. The
CRM has accepted analyte (Cu) content. To validate the method
you used, you also run a sample of CRM. Result you obtain is
compared with the CRM accepted value in terms of % recovery.
• Your obtained mean Cu of CRM is 144.7 mg/Kg (using your
method)
• Accepted or certified value of Cu in freshwater sediment is 146
mg/Kg (similar matrix to the sample)
• % Recovery = (Obtained CRM value/accepted CRM value) x 100
what does that mean. explain the answer
CRM has accepted analyte (Cu) content. To validate the method
you used, you also run a sample of CRM. Result you obtain is
compared with the CRM accepted value in terms of % recovery.
• Your obtained mean Cu of CRM is 144.7 mg/Kg (using your
method)
• Accepted or certified value of Cu in freshwater sediment is 146
mg/Kg (similar matrix to the sample)
• % Recovery = (Obtained CRM value/accepted CRM value) x 100
what does that mean. explain the answer
Answers
GPT 3.5
In this scenario, the mean Cu content of the CRM obtained using your method is 144.7 mg/Kg. The accepted or certified value of Cu in the freshwater sediment CRM is 146 mg/Kg, which is the value that is known to be accurate.
To determine the accuracy of your method, you calculate the % recovery by dividing the obtained CRM value by the accepted CRM value and then multiplying by 100. This calculation allows you to see how close your results are to the known value.
In this case, the % recovery would be:
(144.7 mg/Kg / 146 mg/Kg) x 100 = 99.52%
This means that you have achieved a % recovery of 99.52%, indicating that your method is accurate and reliable for analyzing Cu content in freshwater sediment. A % recovery close to 100% indicates that your method is producing results that are very similar to the accepted values, providing confidence in the accuracy of your analysis.
To determine the accuracy of your method, you calculate the % recovery by dividing the obtained CRM value by the accepted CRM value and then multiplying by 100. This calculation allows you to see how close your results are to the known value.
In this case, the % recovery would be:
(144.7 mg/Kg / 146 mg/Kg) x 100 = 99.52%
This means that you have achieved a % recovery of 99.52%, indicating that your method is accurate and reliable for analyzing Cu content in freshwater sediment. A % recovery close to 100% indicates that your method is producing results that are very similar to the accepted values, providing confidence in the accuracy of your analysis.