Table 1.

Analysis of NIST 1486 (bone meal) by AAS (microgram per gram) and Ca and Mg (percent)

Metal	Certified/noncertified	Measured (n = 6)	Recover %	Accuracy %
Cd	0.003a	0.0029	93.3	−6.7
Cu	0.8a	0.87	108.8	8.8
Fe	99b	93	93.9	−6.1
Mn	1a	0.98	98.0	−2.0
Pb	1.335b	1.228	92.0	−8.0
Zn	147b	140	95.2	−4.8
Mg	0.466b	0.491	105.4	5.4
Ca	26.58b	24.67	92.8	−7.2
K	412b	384	93.2	−6.8

^aNoncertified

^bCertified