Which analytical methods are commonly used to measure lead on wipe samples after digestion?

Which analytical methods are commonly used to measure lead on wipe samples after digestion?

• A. ICP-MS after digestion
• B. AAS after digestion
• C. Both ICP-MS after digestion and AAS after digestion
• D. XRF

Answer: (C)

When you digest wipe samples, you turn all the lead into a soluble form so you can accurately measure its concentration in a liquid. The two most common instruments for this are ICP-MS and AAS. ICP-MS is extremely sensitive for trace metals, with detection in the ppb to ppt range, and it can handle multiple elements in one run. This makes it a top choice for digested wipe solutions where you want precise, low-level quantification and the option to screen for other metals too. AAS, specifically graphite furnace AAS, is also very sensitive for lead in solutions. It’s a practical, cost-effective option for labs that routinely quantify a single element like lead in digested samples and want reliable results with relatively straightforward prep. XRF, on the other hand, is typically used for direct surface analysis or solid samples without digestion. After digestion, XRF is not the standard approach because the technique isn’t as well-suited to accurately quantifying dissolved lead at the low levels usually encountered in wipe samples, and the matrix effects are more challenging. So the standard practice is to analyze digested wipe solutions with either ICP-MS or AAS, depending on the lab’s needs and resources.

When you digest wipe samples, you turn all the lead into a soluble form so you can accurately measure its concentration in a liquid. The two most common instruments for this are ICP-MS and AAS.

ICP-MS is extremely sensitive for trace metals, with detection in the ppb to ppt range, and it can handle multiple elements in one run. This makes it a top choice for digested wipe solutions where you want precise, low-level quantification and the option to screen for other metals too.

AAS, specifically graphite furnace AAS, is also very sensitive for lead in solutions. It’s a practical, cost-effective option for labs that routinely quantify a single element like lead in digested samples and want reliable results with relatively straightforward prep.

XRF, on the other hand, is typically used for direct surface analysis or solid samples without digestion. After digestion, XRF is not the standard approach because the technique isn’t as well-suited to accurately quantifying dissolved lead at the low levels usually encountered in wipe samples, and the matrix effects are more challenging.

So the standard practice is to analyze digested wipe solutions with either ICP-MS or AAS, depending on the lab’s needs and resources.