当前位置：
X-MOL 学术
›
Anal. Methods
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Thiol-mediated etching of gold nanorods as a neoteric strategy for room-temperature and multicolor detection of nitrite and nitrate
Analytical Methods ( IF 2.7 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1ay01117k Marzieh Sepahvand 1 , Forough Ghasemi 2 , Hossein Mir Seyed Hosseini 1
Analytical Methods ( IF 2.7 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1ay01117k Marzieh Sepahvand 1 , Forough Ghasemi 2 , Hossein Mir Seyed Hosseini 1
Affiliation
|
The excessive presence of nitrite and nitrate in environmental matrixes has raised concerns among the scientific communities due to their negative impacts on human health and living organisms. Considering the necessity of regular monitoring and rapid evaluation of nitrite and nitrate, it is of great interest to develop methods capable of on-site detection of these compounds. This study presents a non-aggregation colorimetric method based on etching gold nanorods (AuNRs) for visual detection of nitrite and nitrate. Instead of temperature, we propose using thiourea as a sulfur-containing compound to accelerate the rate of AuNR etching. Thiourea forms stable cationic species with Au+ ions and consequently speeds up the etching process by reducing the redox potential of Au+/Au. In the presence of thiourea, the AuNRs are etched by nitrite resulting in wide obvious color changes from brown to light brown, green, blue, purple, pink, and colorless. In addition to nitrite, the developed method is capable of nitrate determination by reducing nitrate to nitrite through acid-washed zinc powder and is the first report of colorful detection of nitrate. Under optimized conditions, a good linear relationship was found between nitrite/nitrate concentration and the colorimetric response in the range of 8.0 to 100 μmol L−1 and 0.5 to 3.0 mmol L−1 with a limit of detection (LOD) as low as 1.3 μmol L−1 and 173.3 μmol L−1 for nitrite and nitrate, respectively. Furthermore, the practical application of our developed probe was confirmed by accurate determination of nitrite and nitrate in various complex media including water samples, soil extracts, and food products such as salami and sausage.
中文翻译：
硫醇介导的金纳米棒蚀刻作为室温和多色检测亚硝酸盐和硝酸盐的新策略
由于亚硝酸盐和硝酸盐对人类健康和生物体的负面影响，环境基质中过量存在的亚硝酸盐和硝酸盐引起了科学界的关注。考虑到对亚硝酸盐和硝酸盐进行定期监测和快速评估的必要性，开发能够现场检测这些化合物的方法具有重要意义。本研究提出了一种基于蚀刻金纳米棒 (AuNRs) 的非聚集比色方法，用于视觉检测亚硝酸盐和硝酸盐。我们建议使用硫脲作为含硫化合物而不是温度来加速 AuNR 蚀刻的速率。硫脲与 Au +离子形成稳定的阳离子物质，因此通过降低 Au +的氧化还原电位来加速蚀刻过程/金。在硫脲存在下，AuNRs 被亚硝酸盐蚀刻，导致从棕色到浅棕色、绿色、蓝色、紫色、粉红色和无色的广泛明显颜色变化。除亚硝酸盐外，该方法还可以通过酸洗锌粉将硝酸盐还原为亚硝酸盐进行硝酸盐测定，是首次对硝酸盐进行彩色检测的报道。在优化条件下，亚硝酸盐/硝酸盐浓度与比色响应之间存在良好的线性关系，范围为 8.0 至 100 μmol L -1和 0.5 至 3.0 mmol L -1，检测限 (LOD) 低至 1.3 μmol L -1和 173.3 μmol L -1分别为亚硝酸盐和硝酸盐。此外，我们开发的探针的实际应用得到了对各种复杂介质（包括水样、土壤提取物以及意大利腊肠和香肠等食品）中亚硝酸盐和硝酸盐的准确测定的证实。
更新日期：2021-09-09
中文翻译：
硫醇介导的金纳米棒蚀刻作为室温和多色检测亚硝酸盐和硝酸盐的新策略
由于亚硝酸盐和硝酸盐对人类健康和生物体的负面影响，环境基质中过量存在的亚硝酸盐和硝酸盐引起了科学界的关注。考虑到对亚硝酸盐和硝酸盐进行定期监测和快速评估的必要性，开发能够现场检测这些化合物的方法具有重要意义。本研究提出了一种基于蚀刻金纳米棒 (AuNRs) 的非聚集比色方法，用于视觉检测亚硝酸盐和硝酸盐。我们建议使用硫脲作为含硫化合物而不是温度来加速 AuNR 蚀刻的速率。硫脲与 Au +离子形成稳定的阳离子物质，因此通过降低 Au +的氧化还原电位来加速蚀刻过程/金。在硫脲存在下，AuNRs 被亚硝酸盐蚀刻，导致从棕色到浅棕色、绿色、蓝色、紫色、粉红色和无色的广泛明显颜色变化。除亚硝酸盐外，该方法还可以通过酸洗锌粉将硝酸盐还原为亚硝酸盐进行硝酸盐测定，是首次对硝酸盐进行彩色检测的报道。在优化条件下，亚硝酸盐/硝酸盐浓度与比色响应之间存在良好的线性关系，范围为 8.0 至 100 μmol L -1和 0.5 至 3.0 mmol L -1，检测限 (LOD) 低至 1.3 μmol L -1和 173.3 μmol L -1分别为亚硝酸盐和硝酸盐。此外，我们开发的探针的实际应用得到了对各种复杂介质（包括水样、土壤提取物以及意大利腊肠和香肠等食品）中亚硝酸盐和硝酸盐的准确测定的证实。
京公网安备 11010802027423号