Table 4: Measured As and Pb levels in five reference urine samples compared with the results of an interlaboratory study by ICP-MS measurements.

SampleAs ( g/L, ppb)Pb ( g/L, ppb)
HD XRFICP-MSHD XRFICP-MS

EU03-1<35
EU03-2<35 <40<0.7
EU03-3
EU03-4
EU03-5 <40