Fig. 10From: Simple and rapid colorimetric sensing of Ni(II) ions in tap water based on aggregation of citrate-stabilized silver nanoparticlesSilver nanoparticle solution upon addition of (a) 1.1 mM, (b) 1.2 mM, and (c) 1.6 mM of Ni2+ in distilled water (DI) and tap waterBack to article page