Rapid Identification and Quantitative Analysis of Polycarboxylate Superplasticizers Using ATR-FTIR Spectroscopy Combined with Chemometric Methods

Table 3

Rotating principal component factor score.

No.	Wave number (cm^−1)	Factor 1	Factor 2	Factor 3	Factor 4	Upper bound (cm^−1)	Lower bound (cm^−1)
1	2859	−0.002	0.015	−0.006	−0.006	2755	3000
2	1730	−0.020	−0.022	−0.060	−0.025	1681	1754
3	1573	0.047	0.005	0.046	−0.006	1504	1652
4	1466	0.005	0.015	0.003	−0.005	1428	1504
5	1409	0.026	0.005	0.014	0.002	1385	1427
6	1342	−0.002	0.036	0.013	0.001	1318	1353
7	1278	−0.002	0.022	-0.005	0.005	1263	1298
8	1241	−0.006	0.014	−0.016	−0.002	1223	1258
9	1093	−0.019	0.118	0.062	0.036	1067	1132
10	961	−0.008	0.035	−0.006	0.013	982	1032
11	839	−0.021	0.041	−0.006	−0.001	895	979