Table 1.

Experimental conditions for the extraction of zinc from Ydj1.

Variable parameter	Studied interval	Optimum
Chelating agent	EDTA, EGTA, 1,10-phenantroline	1,10-phenantroline
Medium pH	7.5–9.0	8.5
Incubation time (hours)	1–48	24
Chelating agent concentration (mmol L−1)	1–10	1
Incubation temperature (°C)	4–37	37