Method for detecting high-concentration copper ions by spectrophotometric method

Abstract

The invention relates to a method for detecting high-concentration copper ions by spectrophotometry, which comprises the following steps: adding an imidazole or substituted imidazole solution into a water body containing copper ions, uniformly mixing and standing to obtain a sample solution to be detected, and directly measuring the concentration of the copper ions by spectrophotometry according to the absorbance of the sample solution to be detected, the detection method provided by the invention realizes rapid, timely and sensitive detection of copper ions in a solution, the detection is accurate, the sensitivity is high, the operation is simple, the imidazole-copper ion complex has an obvious absorption peak at 610nm, the linear response interval of the peak is relatively large, UV spectral lines before and after coordination are not overlapped, and the detection result is accurate. After imidazole and copper ions are coordinated, the absorbance and the concentration are both in a linear relationship, and R2gt; the linear relation of a standard curve is good, and the method is suitable for quantitative measurement in a relatively large copper ion concentration range.

Description

technical field [0001] The invention relates to a method for detecting high-concentration copper ions by spectrophotometry, and belongs to the technical field of water body detection. Background technique [0002] With the rapid growth of the world's population and the increasing scarcity of available freshwater resources, as well as stricter regulations from environmental regulators, there is an increasing need to improve the performance of water treatment technologies. However, industrial activities discharge a large amount of wastewater containing heavy metal ions, resulting in degraded water quality and even harmful effects on living organisms. After heavy metal ions enter the human body and accumulate to a certain limit, it may cause serious diseases. Therefore, the establishment of a fast and efficient heavy metal ion detection method is not only conducive to grasping the paths and characteristics of the transmission and migration of heavy metals, but also provides th...

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Problems solved by technology

For example, the copper reagent method, when the concentration of copper ions is high, its absorbance value is not high and has no linear relationship with the concentration, that is, it does not conform to the Lambert-Beer law, and is not suitable for the detection of high-concentration copper ion aqueous solutions, which limits the application. scope

[0007] 2. The UV spectral lines of the chromogenic agent and the complex overlap, causing serious measurement interference

Although the measurement of the copper ion concentration can be carried out according to the difference between the two, the amount of xylenol orange in the measurement will be strictly controlled to reduce the error, otherwise the accuracy of the measurement will be reduced (see figure 1 shown)

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