Device for measuring zinc in water by virtue of flow injection spectrophotometry and method for measuring zinc in water

Abstract

The invention discloses a device for measuring zinc in water by virtue of flow injection spectrophotometry and a method for measuring zinc in water, wherein the device has relatively high sensitivity and good selectivity and can be directly applied to determining trace zinc in environmental water. The device is characterized by being composed of a water sample pump (3), a buffer solution pump (5), a chelating agent solution pump (7), a masking column (8), a first complexing agent pump (10), an eluent pump (12), an enrichment-elution column (14), a buffer solution pump (16), a second complexing agent pump (18) and a detection chamber (22), wherein the water sample pump (3), the buffer solution pump (5) and the chelating agent solution pump (7) are connected with the inlet end of the masking column (8) by use of pipelines; the first complexing agent pump (10) and the eluent pump (12) are connected with the outlet end of the masking column (8) by use of pipelines; the eluent pump (12) is connected with the inlet end of the enrichment-elution column (14) by use of a three-way valve; and the buffer solution pump (16), the second complexing agent pump (18) and the detection chamber (22) are connected with the outlet end of the enrichment-elution column (14). The invention also discloses a method for measuring zinc in water.

Description

technical field [0001] The invention relates to the field of devices for measuring zinc in water bodies, in particular to a mobile device with high sensitivity and good selectivity, stable system, simple and fast operation, and can be directly applied to the determination of trace zinc in environmental water. A device for measuring zinc in water by injection photometry and a measuring method thereof. Background technique [0002] The heavy metal zinc pollutes the marine environment, poisons marine organisms, and then passes through the food chain, causing harm to the human body, which has attracted widespread attention in recent years. Since zinc is not stable in many media, there are many influencing factors, and the determination conditions are strict. Therefore, it is of great significance to establish a rapid determination method for trace zinc in seawater for marine pollution monitoring and environmental protection. [0003] At present, the methods for the determinatio...

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Problems solved by technology

[0004] The determination of zinc by spectrophotometry requires a large amount of organic reagents, mainly including dithizone and azo reagents. In addition, there are many other types of chromogenic reagents, but the main problem is that there is serious interference and poor selectivity, and some even require Use the highly toxic reagent cyanide as a masking agent, thus causing environmental pollution

[0005] To sum up, the common features of these methods are long duration, complex analysis process, harsh conditions, large consumption of reagents, and some methods also introduce harmful organic solvents to varying degrees, resulting in a large amount of waste of reagents and secondary pollution.

At the same time, the atomic absorption method requires expensive and large-scale instruments. In addition, the method adopts the mode of on-site sampling-laboratory analysis, that is, the method of on-site and rapid measurement cannot be realized, and other interfering substances are easily introduced during the sample transportation and processing process, which affects the analysis. accuracy

Therefore, it is impossible to guarantee that there will be no possibility of secondary pollution for the analysis of trace elements in this process. Moreover, in the complex and changeable water environment, the form of elements is greatly affected by time and space, and most of them are in a state of mutual correlation and mutual influence. The accuracy of its measurement results has been questioned, so it is impossible to accurately grasp the current status of water quality and its abnormal changes

[0006] In recent years, with the development of electronic technology, new materials, new processes, and new optical devices, especially the rapid development of computer technology, methods for analyzing zinc in water bodies through automatic analyzers have emerged correspondingly, although these technologies have gotten rid of laboratory analysis. Some disadvantages, such as long duration, complex analysis process, harsh conditions, etc., but there are also insurmountable defects such as poor stability, low sensitivity and resolution, ion interference, etc., which limit the scope of application and fail to be widely used. Applications

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