Spectrophotometric Determination of p-Nitrophenol under ENP Interference

Table 1

The physical and chemical properties of p-nitrophenol [32].

Parameter	PNP	Parameter	PNP
Molecular formula	C6H5NO3	Molar mass	139.11 g/mol
pKa	7.15 (25°C)	Water solubility	1.6 g/L (25 °C)
Melting point	113‒114°C	Boiling point	279 °C
LD50	250 mg/kg (rats, orally)	Octanol/water partition coefficient	1.91
Molecular structure in acid solution (colorless)
Molecular structure in alkaline solution (yellow)