Densitometric method Fluorimetric method
Claimed  taken Pure added R% of added Claimed taken Pure added R% of added
0.7 0.7 99.81 1.2 0.6 101.53
1 101.45 0.8 99.04
1.4 100.42 1.2 100.07
1.8 99.13 2.4 100.04
Mean ± SD 100.2 ± 0.9 100.17 ± 1.02
Table 4: Application of standard addition technique for the determination of zaleplon in its pharmaceutical preparation by the proposed methods.