Fig. 4: Emission rates of HCl at 110 °C from the PVC samples from 2019 (blue columns) and the 1980s/1990s (orange columns), that are plasticized (columns with the pattern) or unplasticized (monochromatic columns). | npj Heritage Science

Fig. 4: Emission rates of HCl at 110 °C from the PVC samples from 2019 (blue columns) and the 1980s/1990s (orange columns), that are plasticized (columns with the pattern) or unplasticized (monochromatic columns).

From: Poly(vinyl chloride) degradation: identification of acidic degradation products, their emission rates, and implications for heritage collections

Fig. 4: Emission rates of HCl at 110 °C from the PVC samples from 2019 (blue columns) and the 1980s/1990s (orange columns), that are plasticized (columns with the pattern) or unplasticized (monochromatic columns).

Two sampling periods were selected based on the experiment shown in Fig. 3 to represent the two phases. One replicate was performed for each determination. The uncertainty of the method is 18%, which accounts for instrumental and random error as well as sample and sorbent tube inhomogeneity.

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