Supplied Units:
micromoles per liter (umol/L)
Description:
total particulate nitrogen uncertainty. For <51-um particles, determined as 3 x SD of typical QMA dip blanks, scaled by the volume filtered and fraction of the filter area analyzed. See note in Processing Description regarding QMA punch-to-punch variability. Total particulate nitrogen uncertainty for >51-um particles is unavailable because blanks were below the analytical detection limit.