Given concentration of lead per deciliter of blood is
5.2μg/deciliter
                                                                      Â
=
5.2μg/0.1L                  Â
since 1 deciliter = 0.1L
                                                                      Â
= 52 μg/L
                                                                      Â
= 52
ppb                      Â
since 1 ppb = 1μg/L
Therefore the concentration of lead is 52 ppb