Filtration colorimetric analysis method used for highly sensitive and selective detection of trace nickel ions in solution

Abstract

The invention relates to colorimetric analysis and provides a filtration colorimetric analysis method used for highly sensitive and selective detection of trace nickel ions in a solution. According to the invention, a nickel ion indicator reacts with a solution containing trace nickel ions so as to produce precipitate suspendingly dispersing in the solution, the solution containing the precipitate is pumped into a flow cell by a peristaltic pump, and the solution is filtrated after passing through a microporous membrane stuck in the middle of the flow cell; an electronic imaging device is used to capture colors of the membrane before and after the precipitate is filtrated; change values of a green channel in three channels, i.e., a red channel, the green channel and a blue channel, of images obtained before and after the color of the membrane is changed are extracted, and a concentration gradient standard curve between nickel ions and the change values of the green channel is constructed; in the process of testing of a sample, obtained change values of a green channel of the sample are compared to values in the curve, thereby realizing quantitative selective analysis of nickel ions in the unknown sample. The method provided in the invention can detect nickel ions with a concentration as low as nM-grade, can effectively suppress coexistence-interference of as many as 18 kinds of ions and has high selectivity.

Description

technical field [0001] The invention relates to a colorimetric method, in particular to a filter colorimetric analysis method for highly sensitive and selective detection of trace nickel ions in solution. Background technique [0002] Nickel, because of its excellent mechanical strength, good ductility, super memory ability, and stable chemical properties, is widely used in industries such as steel, metallurgy, paint, national defense, electronics, chemistry, and ceramics. A revolutionary change has come. All kinds of nickel pollution are also lost to the environment, posing a threat to people's lives. Although nickel is an essential metal element for human life activities, the possible nickel requirement per person per day is 25-35 μg. Nickel participates in the composition and metabolism of enzymes in the body, can promote insulin secretion, and lower blood sugar. However, the harm of excessive nickel to the human body cannot be ignored. Excessive nickel intake can lead...

AI Technical Summary

Problems solved by technology

At present, there are also some commercial nickel ion detection test papers on the market, some of which are made by soaking the organic solution containing the indicator and drying it. The fixation of the indicator is not fully considered, which leads to the easy decolorization of the test paper; The indicator is prepared by mixing with the pulp, the production process is cumbersome, and the detection sensitivity is not ideal

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