Concentration standard deviation of gamma-aminobutyric acid {CAS 56-12-2} per unit volume of the water body [particulate >GF/F phase] by filtration, ortho-phthalaldehyde reaction and high performance liquid chromatography (HPLC) gamma-aminobutyric_acid_water>GF/F_SD_HPLC 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::FA15SDP1 SDN:P01::FA15SDP1 SDN:P01::FA15SDP1 5 5 2018-10-15 17:05:31.0 accepted false