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. Author manuscript; available in PMC: 2007 Nov 19.
Published in final edited form as: Anal Chem. 2007 Mar 6;79(7):2756–2761. doi: 10.1021/ac062179n

Figure 4.

Figure 4

Tests for cross-contamination with a color-change reaction. Injecting KSCN solution (clear) into preformed Fe(NO3)3 plugs (clear) resulted in red plugs (Fe(SCN)3 solution). (A) The T-junction caused cross-contamination: the red solution remained in the side channel after injection. The side channel (vertical) was a glass capillary with an i.d. of 200 μm. The main channel (horizontal) was a 200 μm × 200 μm PDMS channel. (B) The multijunction device reduced cross-contamination: no red solution was observed in the side channels (glass capillaries, 100 μm i.d.) after a plug passed by. The main channel was a 200 μm × 250 μm PDMS channel that increased to 250 μm × 250 μm after the junctions.