Which ratio is used for spiked samples relative to field samples?

Which ratio is used for spiked samples relative to field samples?

• A. 1:50
• B. 1:10
• C. 1:100
• D. 1:5

Answer: (A)

Spiking is a QA/QC check where you add a known amount of analyte to a real sample to see how much you recover with the method. The ratio of 1 part spike to 50 parts field sample keeps the spike concentration small enough to not alter the sample’s matrix, while still giving a measurable signal to evaluate recovery. This balance helps ensure the spike recovery reflects the method’s performance on typical field samples. Ratios that are much larger can distort the sample’s chemistry and bias results, while ratios that are too small may produce spikes that are hard to quantify reliably.

Spiking is a QA/QC check where you add a known amount of analyte to a real sample to see how much you recover with the method. The ratio of 1 part spike to 50 parts field sample keeps the spike concentration small enough to not alter the sample’s matrix, while still giving a measurable signal to evaluate recovery. This balance helps ensure the spike recovery reflects the method’s performance on typical field samples. Ratios that are much larger can distort the sample’s chemistry and bias results, while ratios that are too small may produce spikes that are hard to quantify reliably.