Fig. 5From: Does the natural carcinogen ptaquiloside degrade readily in groundwater?PTB vs. PTA detected in samples at different time points in the degradation experiment relative to the concentration at start for each of the waters. The solid line marks a 1:1 conversion from PTA to PTB. Relative standard deviation (quality control standards) was < 7%. At Villingebæk, the squares are on top of each otherBack to article page