Table 1. Suggested Approaches’ Penalty Points Based on the Analytical Eco-Scale.

Parameters	PPs of proposed methods
Reagents
Ultra purified water	0
Butanol	6
Orthophosphoric acid	4
Instruments
Spectrophotometric	0
HPLC energy (>0.1 kWh per sample)	1
Occupational hazard	0
Waste	3
Total PPs	Σ14
Analytical eco-scale score	86