"2" . "Concentration standard deviation of total nitrogen {total_N} {PON} per unit volume of the water body [particulate >GF/F phase] by filtration, acidification and elemental analysis"@en . "SDNTOTP1" . "SDNTOTP1" . "SD_'PON'>GFF" . "22-MAR-16" . . "2" . "Unavailable" . . "accepted" . "SDNTOTP1" .