Chemometric Study of Trace Elements in Hard Coals of the Upper Silesian Coal Basin, Poland

Table 4

Parameters of hard coal samples of the Upper Silesian Coal Basin (USCB) analyzed with HCA.

No.	Parameter	Unit
1	Total moisture, 𝑊^𝑎	[%]
2	Ash, 𝐴^𝑎	[%]
3	Volatiles, 𝑉^𝑎	[%]
4	Total sulfur, S𝑡^𝑎	[%]
5	Heat of combustion, 𝑄𝑠^𝑎	[kJ/kg]
6	Calorific value, 𝑄𝑖^𝑎	[kJ/kg]
7	Carbon, C𝑡^𝑎	[%]
8	Pyritic sulfur, Sp^𝑎	[%]
9	Hg	[ppm]
10	As	[ppm]
11	Ba	[ppm]
12	Cd	[ppm]
13	Co	[ppm]
14	Cr	[ppm]
15	Cu	[ppm]
16	Mn	[ppm]
17	Ni	[ppm]
18	Pb	[ppm]
19	Rb	[ppm]
20	Sb	[ppm]
21	Sr	[ppm]
22	V	[ppm]
23	Zn	[ppm]