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Gd3+(aq) detectability in gadoteric acid (left), gadobutrol and gadoxectic acid (right). Total gadolinium concentration (chelated and un-chelated) of samples is 20 mM. Error bars indicate the overall measurement uncertainty of ±0.0053 ms−1 corresponding to 95% CI. The 0–5 mol% of gadolinium nitrate range is enlarged in separate plots in the lower right corners of the overall plots to show the detection thresholds of Gd3+(aq) in the three GBCAs.
