基于荧光强度的快速便捷的实验室规模纳米塑料定量方法研究

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
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引用次数: 0

摘要

摘要 要彻底研究水环境中的纳米塑料 (NPs),就需要高效、快速的定量分析方法,这些方法既要对环境相关的 NPs 浓度敏感,又要方便使用。在实验室规模的研究中,基于光学分析的定量方法已被公认为是量化 NP 浓度的有效而快速的方法。在此,我们比较了三种常用的光学响应指标,即荧光强度(FI)、紫外吸收率和浊度,以评估它们在定量 NPs 方面的性能。此外,我们还进行了正交实验,以评估各种水质参数对基于指标的首选定量方法的影响。结果表明,FI 与 NP 浓度的相关系数(> 0.99)最高。值得注意的是,各类 NP 的定量限 (LOQ) 极低,在超纯水中为 0.0089 至 0.0584 mg/L,远低于环境相关浓度。尽管 pH 值、盐度、悬浮固体 (SS) 和腐殖酸等水质参数存在差异,但仍能确定可检测到的 FI 与 NP 浓度之间存在密切关系。然而,基质的增加,尤其是水样中 SS 的增加,会导致 NP 的 LOQ 提高。尽管如此,该定量方法仍然适用于实际水体,尤其是饮用水,其 NP LOQ 低至 0.0157-0.0711 mg/L。这超过了之前报道的使用表面增强拉曼光谱法检测到的 40 µg/mL 的 100 nm NPs 检测浓度。这项研究证实了 FI 作为快速定量水环境中 NPs 的可靠指标的潜力,在方便性和成本效益方面都具有很大的优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Toward a rapid and convenient nanoplastic quantification method in laboratory-scale study based on fluorescence intensity

Abstract

The thorough investigation of nanoplastics (NPs) in aqueous environments requires efficient and expeditious quantitative analytical methods that are sensitive to environmentally relevant NP concentrations and convenient to employ. Optical analysis-based quantitative methods have been acknowledged as effective and rapid approaches for quantifying NP concentrations in laboratory-scale studies. Herein, we compared three commonly used optical response indicators, namely fluorescence intensity (FI), ultraviolet absorbance, and turbidity, to assess their performance in quantifying NPs. Furthermore, orthogonal experiments were conducted to evaluate the influence of various water quality parameters on the preferred indicator-based quantification method. The results revealed that FI exhibits the highest correlation coefficient (> 0.99) with NP concentration. Notably, the limit of quantification (LOQ) for various types of NPs is exceptionally low, ranging from 0.0089 to 0.0584 mg/L in ultrapure water, well below environmentally relevant concentrations. Despite variations in water quality parameters such as pH, salinity, suspended solids (SS), and humic acid, a robust relationship between detectable FI and NP concentration was identified. However, an increased matrix, especially SS in water samples, results in an enhanced LOQ for NPs. Nevertheless, the quantitative method remains applicable in real water bodies, especially in drinking water, with NP LOQ as low as 0.0157–0.0711 mg/L. This exceeds the previously reported detectable concentration for 100 nm NPs at 40 µg/mL using surface-enhanced Raman spectroscopy. This study confirms the potential of FI as a reliable indicator for the rapid quantification of NPs in aqueous environments, offering substantial advantages in terms of both convenience and cost-effectiveness.

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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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