Determination of Potassium, Sodium, and Total Alkalies in Portland Cement, Fly Ash, Admixtures, and Water of Concrete by a Simple Flow Injection Flame Photometric System

Table 2

Analyses of certified reference materials of portland cement by FI-FES.

Sample	% Na2O		% K2O
	FI-FES	Certified value	FI-FES	Certified value
CRM 1889	0.134±0.001	0.11	0.264±0.002	0.32
CRM 633	0.661±0.002	0.64	0.149±0.003	0.16
CRM 638	0.151±0.001	0.12	0.572±0.002	0.59