"Concentration standard deviation of dibromomethane {CAS 74-95-3} per unit volume of the water body [dissolved plus reactive particulate <0.4/0.45um phase] by gas chromatography-mass spectrometry"@en . . "SDN:P01::DCMSD003" . "The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en . .