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The interdetector delay volumes (IDV) for multiangle light scattering (MALS) and differential refractometer detectors are essential instrumental parameters affecting reliability and accuracy. However, a reliable and accurate determination method has not yet been established. The paper proposes a method for determining the IDV value. An SEC-MALS setup with the correct IDV value provides more accurate estimates of not only the weight average molar mass and z-average mean-square radius of gyration but also the number average molar mass and differential weight distribution function for polymer samples having narrow and broad molar mass distributions.
