Concentration standard deviation of zinc {Zn CAS 7440-66-6} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by filtration, acidification and inductively-coupled plasma mass spectrometry SD_DissZn<0.4/0.45 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::ZNSDICP6 SDN:P01::ZNSDICP6 SDN:P01::ZNSDICP6 3 3 2018-10-15 17:05:31.0 accepted false