Table 3: Robustness of the proposed methods.

MethodExperimental parameter variationRecovery (%) SDa

No variationb
SDS volume ( L)
 90
 110
pH
Micelle-enhanced spectrofluorometric  5.3
 5.7
Temperature (°C)
 20
 30

No variationb
pH
 3.3
 3.7
Acetylacetone volume (mL)
 0.4
 0.6
Hantzsch reaction Formaldehyde volume (mL)
 0.8
 1.2
Temperature (°C)
 95
 105
Heating time (min)
 18
 22

Mean of three determinations.
Following the general assay procedure conditions.