A pH‐Dependent Colorimetric Probe Based on Sodium Dodecyl Sulfate Silver Nanoparticles for Cadmium(II) and Aluminum(III) Determination

A pH‐Dependent Colorimetric Probe Based on Sodium Dodecyl Sulfate Silver Nanoparticles for Cadmium(II) and Aluminum(III) Determination
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基于十二烷基硫酸钠银纳米颗粒的 pH 依赖性比色探针,用于测定镉 (II) 和铝 (III)

DOI:
10.1002/slct.202000743
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发表时间:
2020-04
期刊:
影响因子:
2.1
通讯作者:
Shengyuan Yang
Shengyuan Yang
中科院分区:
化学4区
文献类型:
--
作者:
Xi Lin;Shunzhen He;Dongliang Xuan;Hao Liang;Fubing Xiao;Feifei Li;Can Liu;Pengfei Fan;Congcong Hu;Shengyuan Yang

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以十二烷基硫酸钠(SDS)修饰的AgNPs为信号探针,建立了一种新的pH依赖性、灵敏、简便的测定水溶液中Cd 2+和Al 3+的方法。在不同的pH值下,该探针显示出基于Cd 2+和Al 3+与SDS的强相互作用的视觉可检测的颜色变化。在pH 9.8的Cd 2+存在下,SDS-AgNP溶液的颜色将从亮黄色变为紫红色,在pH 5.5的Al 3+存在下,SDS-AgNP溶液的颜色将变为红棕色。  在最佳实验条件下,随着Cd 2+浓度的增加,SDS-AgNPs的A580 nm/A390 nm比值逐渐增大,当Cd 2+浓度在4.2×10− 8 M ~ 3.0×10− 6 M范围内呈良好的线性关系。在3.6×10 - 8 M ~ 2.0×10 - 6 M范围内,A390 nm与Al ~(3+)浓度呈线性关系。检测限分别为11.2 nM Cd 2+和7.2 nM Al 3+。  该方法已成功应用于真实的样品中Cd ~(2+)和Al ~(3+)的测定。
A novel pH‐dependent sensitive and convenient assay was proposed for the determination of Cd2+and Al3+in aqueous medium using the sodium dodecyl sulfate (SDS) modified AgNPs as signal probes. In different pH values, the probe showed a visually detectable color change based on the strong interaction of Cd2+and Al3+with SDS. The color of SDS‐AgNPs solution would change from bright yellow to purple red in the presence of Cd2+at pH 9.8, and to reddish brown in the presence of Al3+at pH 5.5. Under the optimum experimental conditions, the ratio ofA580 nm/A390 nmof SDS‐AgNPs gradually increased with increasing of Cd2+, and a good linear relationship was achieved when Cd2+concentration ranging from 4.2×10−8M to 3.0×10−6M. Linear decreasing ofA390 nmrelated to Al3+concentration was over the range of 3.6×10−8M to 2.0×10−6M. The limit of detection was as low as 11.2 nM Cd2+and 7.2 nM Al3+, respectively. Importantly, it has been successfully applied to detect Cd2+and Al3+in real samples.
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