A New Spectrophotometric Method for Determination of Selenium in Cosmetic and Pharmaceutical Preparations after Preconcentration with Cloud Point Extraction

Table 3

Determination of selenium in selenium sulphide shampoo.

Sample taken (mL)	Se (ng mL^−1)		Recovery (%)	% RSD for triplicate measurements
	added	Found
2	0	36.49	—	2.15
2	10	47.02	105.3	2.12
2	20	56.6	100.5	1.85
2	30	65.33	96.1	2.07