Figure 3.

Comparison of total aluminum excretion measured in spot urine samples measured by inductively coupled plasma mass spectrometry (μg/L), along with the calculated contribution from the an extremely rare isotope of aluminum (²⁶Al) labeled antiperspirant (expressed in μg/l total aluminum, calculated from the ²⁶Al excretion measured by accelerator mass spectrometry AMS, according to the ratio of 26Al:27Al in the labeled antiperspirant), for each of the 12 human volunteers, measured in spot samples days after dosing (note volunteers 2 and 10 were recruited in reserve and did not receive treatments with ²⁶Al). The yellow line on each graph represents the lower limit of quantification (LLOQ) of 1 μg/l for inductively coupled plasma mass spectrometry ICP‐MS measurement of total aluminum. The red line is 0.049 μg/l, calculated for the antiperspirant derived aluminum and equivalent to the LLOQ of 0.06 fg/l for ²⁶Al measured by AMS).