基于硅氮掺杂荧光碳点测定水样中痕量Hg(Ⅱ)  

Determination of trace Hg(Ⅱ)in water samples based on Si/N doped fluorescent carbon dots

作　　者：曹丹[1] 李永生[1] CAO Dan;LI Yong-sheng(School of Chemistry and Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学与化工学院,四川成都610065

出　　处：《应用化工》2022年第8期2473-2476,共4页Applied Chemical Industry

摘　　要：利用(3-氨丙基)三乙氧基硅烷和柠檬酸合成了一种硅、氮共掺杂的高量子产率的荧光碳点(SiN-CDs)。Hg(Ⅱ)能静态猝灭SiN-CDs在455 nm处的荧光(λ_(ex)=370 nm),据此建立了一种荧光猝灭测定Hg(Ⅱ)的方法。在pH为7的醋酸盐缓冲溶液中,0.005~6μmol/L的Hg(Ⅱ)与荧光猝灭值(ΔF)呈线性关系,检测限(3σ/k)为3.33 nmol/L,低于世界卫生组织饮用水中Hg(Ⅱ)的指导值。标准加入法测定环境水样中Hg(Ⅱ)含量,其加标回收率为92%~105%,测定值的相对标准偏差(RSD)为0.50%~4.53%。A fluorescent carbon dots(SiN-CDs)with high quantum yield was synthesized from(3-aminopropyl)triethoxysilane and citric acid.Hg(Ⅱ)could statically quench the fluorescence of SiN-CDs at 455 nm(λ_(ex)=370 nm),based on this,a fluorescence quenching method for the determination of Hg(Ⅱ)has been established.The fluorescence quenching value(ΔF)was linear with 0.005~6μmol/L Hg(Ⅱ)in the acetate buffer solution with pH 7,and the detection limit(3σ/k)was 3.33 nmol/L,which was lower than the WHO guidelines for Hg(Ⅱ)in drinking water.The recoveries of Hg(Ⅱ)in environmental water samples were 92%~105%,and the relative standard deviations(RSD)of the measured values were 0.50%~4.53%.

关 键 词：碳点 掺杂 荧光猝灭 Hg(Ⅱ) 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] O657.3[自动化与计算机技术—控制科学与工程] X52[理学—分析化学]