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

An analytical method and selective technology, applied in the field of colorimetry, can solve the problems of insufficient consideration of indicator fixation, unsatisfactory detection sensitivity, cumbersome production process, etc., to achieve enhanced controllability, improved sensitivity, and good selectivity. Effect

Active Publication Date: 2012-05-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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

Method used

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

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Embodiment Construction

[0034] Establishment of standard color card and standard concentration curve

[0035] 1) Preparation of indicator solution:

[0036] The cyclohexanedione oxime was dissolved in the aqueous solution with pH=7 according to the concentration of 0.8 mg / mL.

[0037] 2) Preparation of nickel standard solution:

[0038] Using Wahaha drinking purified water, prepare a series of nickel ion standard solutions of 50nM-20μM with nickel chloride according to the minimum concentration gradient difference of 200nM.

[0039] 3) Precipitation reaction:

[0040] Add 1mL of the indicator solution in ① above to the nickel standard solution in ②, mix thoroughly and let stand for 10 minutes to obtain a solution with red precipitate dispersed in suspension.

[0041] Such as Figure 1 As shown, after the sample solution is pumped into the cavity 202 below the flow cell of the plexiglass base 102 through the peristaltic pump, under the pressure of the peristaltic pump, it passes through the microp...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/82
Inventor 冯亮关亚风张玥沈铮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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