Determination of Diethyl Phthalate and Polyhexamethylene Guanidine in Surrogate Alcohol from Russia

Table 3

Precision and accuracy of the UV/VIS method for analyzing DEP in alcohol samples.

Sample	Wavelength (nm)	RSD Intraday (%); (𝑛=5)^a	RSD Interday (%); (𝑛=7)	Recovery (%) (𝑛=5)
Authentic surrogate alcohol sample from Russia (1344 mg/L)	227	1.8	2.5	—
	276	1.1	6.8	—
Authentic medicinal sample from Russia (311 mg/L)	227	0.9	0.9	—
	276	4.5	4.6	—
Authentic surrogate alcohol sample from Lithuania (608 mg/L)	227	(interference)
	276	1.9	3.0	—
Spiked vodka sample (500 mg/L)	227	1.0	1.2	100
	276	5.5	6.6	105
Spiked vodka sample (1000 mg/L)	227	1.3	1.6	95
	276	2.3	2.8	105

^aRSD: relative standard deviation.