TABLE 2.

Geochemical features of the six samples from the tailings of the realgar mine

Parameter	Tailing sample
	A	B	C	D	E	F
Soil matrix	Fill	Fill	Fill	Clay	Clay	Clay
Moisture content (%)	9.50	2.63	6.82	18.52	22.79	8.29
pH	7.46	8.3	8.05	8.35	8.41	4.12
ECa (μS cm−1)	521	830	631	162	98	58
TOC (g/kg)	59.0	13.6	11.3	9.4	6.7	5.6
SO4 2− (mmol/kg)	3.05	2.33	1.27	0.30	0.81	0.65
Total As (g/kg)	117.47	14.49	8.26	0.32	0.28	0.06
Aqueous As (g/kg)	6.374	5.99	2.433	0.193	0.126	0.07
Aqueous As(III) (g/kg)	0.935	0.775	0.238	0.012	0.018	0.003

^aEC, electrical conductivity.