title: Postage stamp-sized array sensor for the sensitive screening test of heavy-metal ions.
abstract: The sensitive determination of heavy-metal ions has been widely investigated in recent years due to their threat to the environment and to human health. Among various analytical detection techniques, inexpensive colorimetric testing papers/strips play a very important role. The limitation, however, is also clear: the sensitivity is usually low and the selectivity is poor. In this work, we have developed a postage stamp-sized array sensor composed of nine commercially available heterocyclic azo indicators. Combining filtration-based enrichment with an array of technologies-based pattern-recognition, we have obtained the discrimination capability for seven heavy-metal ions (Hg(2+), Pb(2+), Ag(+), Ni(2+), Cu(2+), Zn(2+), and Co(2+)) at their Chinese wastewater discharge standard concentrations. The allowable detection level of Hg(2+) was down to 0.05 mg L(-1). The heavy-metal ions screening test was readily achieved using a standard chemometric approach. And the array sensor applied well in real water samples.
authors: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China. fengl@dicp.ac.cn.
authors: Yu
authors: Y
authors: Zhang
authors: Xiao
authors: X
authors: Li
authors: Hui
authors: H
authors: Li
authors: Ming
authors: M
authors: Song
authors: Liang
authors: L
authors: Feng
authors: Yafeng
authors: Y
authors: Guan
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D016000:Cluster Analysis; D007477:Ions / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis*; D046228:Microarray Analysis; D025341:Principal Component Analysis; D013053:Spectrophotometry; D062065:Wastewater / Q000032:analysis
chemical_list: D001391:Azo Compounds; D007477:Ions; D019216:Metals, Heavy; D062065:Wastewater