Table 3. Contents of As, Ca, S, and Trace Metals in Gypsum Obtained from ACR_real and ACR_lab via the Dissolution–Neutralization Process^a.

element	As (mg/kg)	Ca (wt %)	S (wt %)	Cu (g/kg)	Pb (g/kg)	Zn (g/kg)	Cd (mg/kg)
gypsum-ACRreal	5400	23.6	17.8	0.2	0.1	0.1	18
gypsum-ACRlab	68	23.5	17.3	UD	0.2	UD	89

^aUD represents undetectable.