摘要
针对传统重金属检测材料检测效果不佳的问题,提出一种新型的氮掺杂碳量子点(N-CQDs)试纸材料的快速检测方法。试验首先对N-CQDs的检测条件进行优化,然后对优化条件下的N-CQDs检测精度进行研究,最后将制备的N-CQDs试纸材料用于土壤中汞元素的检测。试验结果表明,在N-CQDs溶液体积为5μL,浓度为101.67μg·mL^(-1),pH=7的条件下反应5min,汞离子对N-CQDs的猝灭效果最好。在该条件下,汞浓度与荧光强度比值存在良好的线性关系,其相关系数R2超过0.99,检出限为0.076μmol·L^(-1);与其他重金属离子共存时,不受其他重金属离子的干扰,只对汞离子产生强烈的猝灭反应,表现出良好的选择性和抗干扰性。以尼龙滤膜为基础纸质,制作N-CQDs试纸,该试纸可根据待测物中汞离子浓度的不同出现不同的荧光猝灭效果,表现出良好的检测效果,可以用于包含土壤中重金属汞检测在内的环境监测中。
A new rapid detection method for nitrogen doped carbon quantum dots(N-CQDs)materials is proposed to address the issue of poor detection performance of traditional heavy metal detection materials.The experiment first optimizes the detection conditions of N-CQDs.Then,the detection accuracy of N-CQDs under the optimized conditions is studied.Finally,the prepared NCD test paper material is used for the detection of mercury in soil.The experimental results indicate that when the volume of NCD solution is 5μL,the concentration is 101.67μg·mL-1,pH=7,and the reaction time is 5 minutes,the quenching eff ect of mercury ions on N-CQDs is the best.Under this condition,there is a good linear relationship between mercury concentration and fl uorescence intensity ratio,with the correlation coefficient R2 exceeding 0.99 and the detection limit of 0.076μmol·L-1.When coexisting with other heavy metal ions,it is not disturbed by other heavy metal ions and only produces a strong quenching reaction on mercury ion,which shows good selectivity and anti-interference.Taking the nylon filter membrane as the base paper,N-CQDs test paper is produced.The test paper can show diff erent fl uorescence quenching eff ects according to the diff erent concentration of mercury ions in the substance to be tested,which has good detection results and can be used for environment detection,including the detection of heavy metal mercury in soil.
作者
刘延锋
邹英杰
LIU Yan-feng;ZOU Ying-jie(Weifang Ecological Environment Monitoring Center,Weifang 261041,Shandong,China)
出处
《合成材料老化与应用》
CAS
2023年第5期106-109,共4页
Synthetic Materials Aging and Application
关键词
氮掺杂碳量子点
重金属汞检测
荧光猝灭
重金属污染
nitrogen doped carbon quantum dots
heavy metal mercury detection
fl uorescence quenching
heavy metal pollution
