Table 3. Recovery and RSD values of mineral contents for SRM 2387 (Standard reference material 2387 peanut butter)

Component	Unit	Reference value	Analysis value	Recovery (%)	RSD1)(%)
Na	mg/100 g	4,890±1402)	4,914±54	100.5±1.8	1.8
Ca		411±18	423±19	102.9±0.1	0.1
K		6,070±200	6,052±23	99.8±2.9	2.9
P		3,378±92	3,417±19	101.1±2.8	2.8
Mg		1,680±70	1,771±29	105.5±2.7	2.5
Fe	μg/100 g	16.4±0.8	16.6±0.2	101.3±3.7	3.7
Zn		26.3±1.1	26.4±0.6	100.4±1.9	1.9
Cu		4.93±0.15	4.93±0.02	100.1±2.6	2.6
Mn		16.0±0.6	16.1±0.3	100.7±1.9	1.9

RSD, Relative standard deviation.
The values represent mean±SD of 3 replications.