"Concentration standard deviation of soluble iron {soluble_Fe CAS 7439-89-6} per unit volume of the atmosphere [aerosol <1um phase] by filtration, water leaching"@en .
.
"SDN:P01::AEC088SD" .
"The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en .
.