The Application of Response Surface Methodology for Lead Ion Removal from Aqueous Solution Using Intercalated Tartrate-Mg-Al Layered Double Hydroxides

Table 1

The level and range of independent variables chosen for removal of lead from aqueous solution using tartrate-Mg-Al layered double hydroxide.

Factor	Variable	Unit	Range and level of actual and
			coded values
			Low actual (−1)	High actual (+1)
𝐴	Time	hour	6	10
𝐵	pH	—	1	3
𝐶	Dosage	mg	0.06	0.1
𝐷	Concentration	mg/L	10	30