Fig. 4. Quantification of unknown concentration of anion specimens by matching with standards, measured with eight-sensor ODF set. (a) Two samples of cyanide at unknown concentration between 0 and 10 mM in buffered water (UA = 1 mM; UB = 5 mM) were correctly grouped based on AHC analysis. (b) Two out of three unknown samples of selenate (UA = 250 μM; UB = 50 μM; UC = 10 μM) showed correct grouping using the same method. UA and UB matched the standard response but not for UC, indicative of a detection limit. The numbered data points indicate four replicates (four sensor beads).
