Table 1: Comparison table for reported methods and proposed methods.

ReagentsRange ( g mL−1) (nm)Molar absorptivity (Lmol−1 cm−1)Reference

Methanol4.00–36.002851.54 × 104[12]
Bromocresol green5.00–25.004151.8 × 104[14]
Ninhydrin0.20–1.204022.571 × 104[15]
Acetaldehyde + SNP0.60–2.005581.617 × 104[15]

Proposed methods

-Chloranil20.00–100.006620.257 × 104
PDAB50.00–250.006010.92 × 103

SNP: sodium nitroprusside; PDAB: -dimethylaminobenzaldehyde.