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The authors describe an optical assay for determination of mercury(II) ion by making use of gold nanorods (AuNRs) which are found to aggregate after addition of 6-mercaptopurine (6-MP) by forming a covalent Au-S bond. Aggregation is accompanied by a color change to blue. However, the 6-MP induced aggregation is inhibited in the presence of Hg(II) results because of the formation of a more stable Hg-S...
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