SOLUTIONS

Best-in-Class Retention Time Precision

Retention Time Precision

Molar mass averages can be affected by changes in the environment and measuring conditions. Generally, these variations are the result of one or more factors including flow rate reproducibility, baseline drift and injection reproducibility. In addition to controlling column temperature, Tosoh engineers added temperature control for both pumps, the degasser chamber and inlet and outlet tubing on the EcoSEC Elite GPC System to deliver top GPC analysis performance.

Figure 1 and Table 1 demonstrate the superiority of the EcoSEC Elite GPC System for the determination of weight-average molar masses.

Reproducibility1-Mw_Elite.jpg

Overlaid chromatogram of Vinyl chloride/vinyl acetate copolymer, intra day (n=10) 

Sample column:      TSKgel SuperMultiporeHZ-M x 2
Reference column: TSKgel SuperH-RC
Mobile phase:          THF
Flow rate:                 0.35 mL/min, Sample and         
                                  Reference
Detection:                RI (EcoSEC Elite GPC System)
Temperature:           40°C 
Injection vol.:          10 µL (1.0 g/L)

Vinyl chloride/vinyl acetate copolymer
Measurement date Mw CV(%)
Day 1 23165 0.305
2 23205 0.216
3 23029 0.109
4 23199 0.215
5 23091 0.182
6 23005 0.167
AVG. 23116 0.199
RSD 86.862 -
CV(%) 0.376 -


Intra day (n=10) CV: 0.199%
Inter day (n=6) CV: 0.376%

Figure 2 and Table 2 demonstrate the superiority of the EcoSEC Elite GPC System for elution time reproducibility

Reproducibility2-Elution_Elite.jpg

Overlaid chromatogram of std. Psts (F-2, F-10),
Intra day (n=10)

Sample column:      TSKgel SuperMultiporeHZ-M x 2
Reference column: TSKgel SuperH-RC
Mobile phase:          THF
Flow rate:                 0.35 mL/min, Sample and
                                  Reference
Detection:                RI (EcoSEC Elite GPC System)
Temperature:           40°C 
Injection vol.:          10 µL (0.2 g/L)



Intra day (n=10) F2 CV: 0.016%; F10 CV: 0.013%
Inter day (n=6) F2 CV: 0.022%; F10 CV: 0.018%
F-2 F-10
Measure
ment date
Retention time (min) CV(%) Retention time (min) CV(%)
Day 1 8.048 0.014 6.887 0.011
2 8.051 0.013 6.889 0.010
3 8.051 0.012 6.889 0.014
4 8.049 0.016 6.887 0.010
5 8.053 0.023 6.890 0.019
6 8.051 0.016 6.888 0.016
AVG. 8.050 0.016 6.888 0.013
RSD 0.002 - 0.001 -
CV(%) 0.022 - 0.018 -