Field comparison of manual and semi-automatic methods for the measurement of total gaseous mercury in ambient air and assessment of equivalence.
The manual and semi-automatic methods for the measurement of total gaseous mercury in ambient air have been compared in a field trial for the first time. The comparison results have shown that whilst the expected random scatter is present, there was no significant systematic bias between the two methods, whose operational differences have also been outlined and analysed in this work. Furthermore it has been observed that because variation in instrument sensitivity is largely random in nature there is little effect on the results of the comparison if the period between instrument calibrations is altered. When the manual and semi-automatic methods are compared according to guidelines produced by the European Commission the results presented here, taken together with other supporting evidence, strongly suggest that the two methods are equivalent.
Analytical Science Division, National Physical Laboratory, Teddington TW11 0LW, UK. richard.brown@npl.co.uk
Richard J C
RJ
Brown
Yarshini
Y
Kumar
Andrew S
AS
Brown
Matthew A
MA
Dexter
Warren T
WT
Corns
D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D001272:Atmosphere / Q000737:chemistry; D001331:Automation; D004784:Environmental Monitoring / Q000379:methods*; D008628:Mercury / Q000032:analysis*
D000393:Air Pollutants; D008628:Mercury