Validation parameters
are summa* The percent recoveries obtained by means of five replicate measurements of Sn(IV) at different concentration levels of 5–100 lg L1.
** The CRMs were treated by dissolving with a mixture of HNO3 and H2O2 (2:1, v/v) and heating on a hot-plate at 120 C prior to detection by CPE/FAAS.
a The critical F(4,4) value is 6.39 for 95% confidence level and four degrees of freedom.
b The critical t-value is 2.31 for 95% confidence level and four degrees of freedom.rized in Table 5.