TM 157 Table B7

Table B7. Concentrations (g/g [ppm] dry weight) of trace metals found in DOLT-1 standard reference material
	Ag	Cd	Cr	Cu	Ni	Pb	Zn	As	Hg
	Detection Limits
	0.052	0.016	0.052	0.12	0.038	0.025	0.65	0.91	0.045
Mean (n=6)	1.03	4.02	0.41	19.3	0.26	1.33	92.4	10.5	0.217
Std. dev.	0.04	0.17	0.07	1.2	0.02	0.08	2.6	1.1	0.015
RSD(%)	3.9	4.2	17.1	6.2	7.7	6.0	2.8	10.5	6.9
Certified	[1.00]^a	4.18	0.40	20.8	0.26	1.36	92.5	10.1	0.225
+/-	-	0.28	0.07	1.2	0.06	0.29	2.3	1.4	0.037
Recovery (%)	103	96	102	93	99	98	100	104	96
^aConsensus value from NOAA-National Research Council Canada intercomparison exercises.

(Modified Jun. 13 2008)