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The as\u2010prepared QDs show good stability in aqueous solution for several months. Oxoanions, including phosphoric acid ion, sulphite acid ion and carbonic acid ion, affect the fluorescence of <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs. Among them, H<jats:sub>2<\/jats:sub>PO<jats:sub>4<\/jats:sub><jats:sup>\u2013<\/jats:sup> exhibited the largest quenching effect. For the polyprotic acids (HO)<jats:sub>3<\/jats:sub>AO, the effect of acidic anions on the fluorescence of <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs was in the order: monoanion (HO)<jats:sub>2<\/jats:sub>AO<jats:sub>2<\/jats:sub><jats:sup>\u2013<\/jats:sup> &gt; dianion (HO)AO<jats:sub>3<\/jats:sub><jats:sup>2\u2013<\/jats:sup> &gt;&gt; trianion AO<jats:sub>4<\/jats:sub><jats:sup>3\u2013<\/jats:sup>. After photoactivation for several days in the presence of anions at alkaline pH, the <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs exhibited strong fluorescence emission. The effect of various heavy and transition metal ions on the fluorescence properties of the <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs was investigated further. It was found that Ag<jats:sup>+<\/jats:sup>, Hg<jats:sup>2+<\/jats:sup> and Co<jats:sup>2+<\/jats:sup> have significant quenching effect on the fluorescence of the <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs. The Stern\u2013Volmer quenching constants increased in the order: Hg<jats:sup>2+<\/jats:sup> &lt; Co<jats:sup>2+<\/jats:sup> &lt;Ag<jats:sup>+<\/jats:sup>. The adsorption model of metal ions on <jats:italic>\u03b2<\/jats:italic>\u2010CD\u2010QDs was explored. 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