Enrichment standard deviation of nitrogen-15 in total nitrogen {15N_in_total_N CAS 14390-96-6} {delta(15)N} in the water body [particulate >GF/F phase] by filtration, combustion and mass spectrometry SD_PONd15N The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement. 2018-10-15 17:05:31.0 SDN:P01::SD15MTP1 SDN:P01::SD15MTP1 SDN:P01::SD15MTP1 3 3 2018-10-15 17:05:31.0 accepted false