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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer Vienna

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DOI

10.1016/0925-9635(92)90020-O

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1436-5073

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Colorimetric and bareeye detection of alkaline ea

Authors: Xiaoyan Wu Wanxin Tang Cong Hou Chao Zhang Ningning Zhu
Publish Date: 2014/02/14
Volume: 181, Issue: 9-10, Pages: 991-998
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Abstract

We describe a simple and rapid method for colorimetric and bareeye detection of the alkaline earth metal ions MgII CaII SrII and BaII based on the use of silver nanoparticles AgNPs functionalized with thioglycolic acid TGA The TGA ligand was selfassembled onto the AgNPs to form a probe that undergoes a color change from yellow to orange or red on exposure to the alkaline earth ions It is presumed that the color change is a result of the aggregation of the AgNPs caused by the interaction of the bivalent ions with the carboxy groups on the AgNPs The color change can be used for bareeye and colorimetric determination of the alkaline earth metal ions for example to rapidly determine water hardnessWe have developed an efficient colorimetric method for alkaline earth metal ions using silver nanoparticles functionalized with thioglycolic acid as probe This probe selectively recognizes alkaline earth metal ions through a distinct visual color change from yellow to red

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