Table 2. Low-Temperature Nitrogen Testing Results of Coal Samples from the Huaibei Coalfield^a.

				volume percentage/%			area percentage/%
sampling site	SSA/m2/g	MPPZ/nm	TPV/10–3cm3/g	micropore	TP	mesopore	micropore	TP	mesopore
Yuanzhuang mine	0.561	4.016	1.643	33.16	43.3	23.54	78.21	20.01	1.78
Hengyuan mine	0.254	4.026	0.766	37.39	38.44	24.17	82	16.69	1.31
Wobei mine	0.48	4.028	1.023	45.88	38.79	15.33	84.27	14.88	0.85
Haizi mine	0.393	3.608	0.728	51.54	34.39	14.07	86.72	12.8	0.48
Taoyuan mine	0.43	4.013	1.007	46.45	46.94	6.61	83.07	16.61	0.32
Wugou mine	0.446	3.226	1.159	38.32	53.78	7.9	76.75	22.68	0.57
Qianyingzi mine	0.697	3.07	1.712	40.65	39.09	20.26	82.58	16.18	1.24

^aSSA, specific surface area; MPPZ, most probable pore size; TPV, total pore volume; TP, transitional pore.