Accuracy of Various
Molecular Weight Determination Methods
| Method of Determination | Standard Error of Estimate |
|---|---|
| Mw by LALLS (Mw above 50,000) | + / - 5 to 10 % |
| Mw by LALLS (Mw below 50,000) | + / - 10 to 15 % |
| Mn by LALLS | + / - 20 to 30 % |
| Mw by MALLS (Mw above 100,000) | + / - 3 to 10 % |
| Mw by MALLS (Mw below 100,000) | + / - 10 to 15 % |
| Mn by MALLS | + / - 20 to 30 % |
| Mn by Membrane Osmometry (Mw above 50,000) |
+ / - 5 to 10 % |
| Mn by Vapor Pressure Osmometry (Mw 15,000 - 30,000) |
+ / - 10 to 15 % |
| Mn by Vapor Pressure Osmometry (Mw below 15,000) |
+ / - 2 to 5 % |
| Mw by GPC/SEC | + / - 3 to 10 % |
| Mn by GPC/SEC | + / - 10 to 15 % |
| Mz by GPC/SEC | + / - 10 to 15 % |
| Mp by GPC/SEC | + / - 3 to 10 % |
| Mw by GPC/DV Universal Calibration | + / - 5 to 10 % |
| Mn by GPC/DV Universal Calibration | + / - 10 to 15 % |
| Mz by GPC/DV Universal Calibration | + / - 10 to 15 % |
| Mp by GPC/DV Universal Calibration | + / - 5 to 10 % |
| Mn by End Group Analysis (Mw below 10,000) |
+ / - 10 to 15 % |
| Mz by Ultra Centrifuge (Mw above 10,000) | + / - 10 to 15 % |
| Mv by Viscotek Viscometer Y501-C | + / - 5 to 10 % |
| Intrinsic Viscosity by Viscosity Y501-C | + / - 5 to 10 % |