Rapid Quantification of Melamine in Different Brands/Types of Milk Powders Using Standard Addition Net Analyte Signal and Near-Infrared Spectroscopy

Table 2

Composition of serial samples spiked with different amounts of melamine standard.

Sample levels	Melamine content; (%, w/w)	Gradient of melamine standard added; (%, w/w)
1	0	0.01, 0.02, 0.04, and 0.08
2	0.01	0.01, 0.03, 0.07, and 0.11
3	0.02	0.02, 0.06, 0.10, and 0.14
4	0.04	0.04, 0.08, 0.12, and 0.20
5	0.08	0.04, 0.08, 0.16, and 0.24
6	0.12	0.04, 0.12, 0.20, and 0.36