Concentration standard deviation of nitrate {NO3- CAS 14797-55-8} per unit volume of the atmosphere [aerosol >1um phase] by filtration and ion chromatography SD_NO3_aerosol_>1um 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 17:05:30.0 SDN:P01::ASDNIT02 SDN:P01::ASDNIT02 SDN:P01::ASDNIT02 3 3 2018-10-15 17:05:30.0 accepted false