Distributions and Sources of Sedimentary Sterols as well as Their Indications of Sewage Contamination in the Guanting Reservoir, Beijing

Table 8

Component factor matrix of principal component analysis of sterols in sediments of the Guanting Reservoir.

Sterol	Principal component
	1	2	3
Cholesterol	0.968	0.079	0.069
Cholestanol	0.910	0.289	0.241
Coprostanol	0.371	0.821	0.289
Epicoprostanol	0.571	0.721	0.209
Campesterol	−0.004	0.921	0.129
Sitosterol	0.023	0.293	0.919
Stigmasterol	0.286	0.107	0.920