A membrane enrichment-ultraviolet-visible diffuse reflection spectroscopy based trace heavy-metal-ion measuring method

Abstract

The invention relates to a membrane enrichment-ultraviolet-visible diffuse reflection spectroscopy based trace heavy-metal-ion measuring method. The method includes inspecting complexing effects of different complexing agents, selecting a proper complexing agent, complexing a plurality of heavy metal ions at the same time, preparing a plurality of water solution samples containing the heavy metal ions with different concentration ranges, enriching each sample with a mixed cellulose membrane separately, measuring the filter membranes enriching the metal ions by ultraviolet-visible diffuse reflection spectroscopy, dividing collected ultraviolet-visible diffuse reflection spectrums into a training set and a prediction set, building a partial least squares regression model by adopting the training set, and predicting the concentration of an unknown sample by using the prediction set. According to the method, the membrane enrichment technique is introduced to the field of heavy metal ion detection for a water body, and a diffuse reflection mode of UV-visible spectroscopy is adopted to directly measure the membranes enriching the heavy metal ions, thus avoiding elution, simplifying operation steps and improving detection sensitivity. In addition, by adopting chemometric modeling, simultaneous accurate quantitative analysis of a plurality of trace heavy metal ions in water solutions is achieved. The method is suitable for simultaneous detection of a plurality of trace heavy metal ions in a water body.

Description

technical field [0001] The invention relates to a method for detecting the concentration of heavy metal ions in an aqueous solution, in particular to a method for measuring trace heavy metal ions based on membrane enrichment-ultraviolet-visible diffuse reflectance spectroscopy. Background technique [0002] With the development of society and the intensification of industrialization, heavy metals are discharged into water bodies in various forms, and then enriched through the food chain, so that the concentration increases, and finally enter the human body through the food chain, which affects human health and the living conditions of various organisms. posed a serious threat. To solve the problem of heavy metal pollution, first of all, based on the control of pollution sources, we should implement relevant environmental protection laws and regulations to prevent the occurrence of environmental pollution; secondly, we must establish a sound early warning mechanism for heavy ...

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Problems solved by technology

However, the main disadvantage of this method is the low sensitivity

In the national health standards, the limits required for heavy metals are generally at the ppb level (ng / mL), and traditional UV-visible spectroscopy methods usually cannot meet this requirement. Therefore, it is particularly important to establish an effective pre-enrichment method for the determination of heavy metal ions

[0004] Different pre-enrichment methods have been applied to the detection of heavy metal ions, such as liquid-liquid extraction, solid-phase extraction, ion exchange, etc. These methods have disadvantages such as time-consuming operation and elution steps

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