Table 5.
Phosphorus determination in certified materials compared with ICP-OES and Molybdenum blue colorimetric method using microwave digestion procedure

CRMs	Molybdenum blue colorimetric method		Microwave method (ICP-OES)
	Measured (mg/kg, mean±SD)	Recovery (%)	Measured (mg/kg, mean±SD)	Recovery (%)
	SRM 1849a	4,451.18±56.90	111.56	4,376.60±96.69	109.69
SRM 1546	1,400.09±35.48	91.51	1,656.24±44.97	108.25
LGC 7105	369.52±17.55	106.80	364.06±23.33	105.22
LGC 7104	900.81±16.39	109.45	891.58±44.70	108.33
SRM 1548a	2,896.02±64.75	83.08	3,331.47±54.02	95.57
SRM 2385	314.27±11.54	97.09	362.81±5.51	112.08
	t-test	-0.03 (2.45)