han single element techniques.
The need for the standardization of the analytical metho-
dology and availability of analytical standards was illustrated
by the US. Environmental Protection Agency's round robin
analysis of four fuel matrices for 28 elements in nine labo-
ratories (3). Same samples of coal, fly ash, fuel oil, and gasoline
were analyzed for 28 elements in nine laboratories by a variety
of analytical techniques - neutron activation analysis, atomic
absorption spectrophotometry, spark source mass spectrom-
etry, optical emission spectrometry, anodic stripping voltam-
metry, and X-ray fluorescence. Amongst the elements in-
vestigated were elements of environmental concern