Preparation method and application of visual, portable and quick mercury ion detection test paper
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A technology for detecting test strips and mercury ions, which is applied in the directions of testing water, analyzing materials by chemical reaction, and analyzing materials by observing the influence of chemical indicators to achieve the effect of easy portability, remarkable effect and simple operation.
Inactive Publication Date: 2012-10-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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The preparation of mercury ion detection test paper by chemically grafting rhodamine derivatives onto filter paper has not yet been reported in literature and patents.
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Embodiment 1
[0029] 1. Add 1 part of Rhodamine B dye to the container by molar ratio, dissolve it with 40 mL of ethanol, then add 20 parts of hydrazine hydrate, heat and reflux until the color of Rhodamine B disappears, filter, wash with water, and dry, the obtained solid is Rhodamine B hydrazide.
[0030] 2. Add 1 part of filter paper in molar ratio to the container, soak it with 30mL of ethanol, add 3 parts of sodium hydride for alkalization, then add 10 parts of p-bromobenzyl bromide, react at room temperature for 15 hours, take out the cellulose paper, and wash with water Rinse and dry.
[0031] 3. Add 1 part of the filter paper obtained in step 2 into the container by molar ratio, soak it with 30mL N, N'-dimethylformamide, then add 1 part of allyl isothiocyanate, aqueous sodium hydroxide ( 2M) 3mL and 0.2 parts of tetrakis(triphenylphosphopalladium), heated to reflux for 5 hours, then took out the filter paper, rinsed with water, and dried.
[0032] 4. Add 1 part of the filter paper...
Embodiment 2
[0039] 1. Detection test paper preparation steps are as steps 1-4 of embodiment 1.
[0040] 2. Prepare 1mM standard stock solutions of other ions respectively.
[0041] 3. Add appropriate volumes of other ion standard solutions prepared in step 2 to the sample vials, and dilute to 10 mL with water to prepare 300 μM other ion standard solutions.
[0042] 4. Add the various ions in step 3 dropwise to the prepared detection test paper.
[0043] 5. Detect the selectivity of the test paper to other ions such as image 3 shown.
Embodiment 3
[0045] 1. Detection test paper preparation steps are as steps 1-4 of embodiment 1.
[0046] 2. Take the aqueous solution that may contain mercury ions to be detected as the detection object, and add the aqueous solution dropwise to the prepared detection test paper.
[0047] 3. Use 365nm ultraviolet lamp to irradiate and observe the color change to figure 2 Compare the standard colors to determine the mercury ion concentration or concentration range in the aqueous solution.
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Abstract
The invention discloses visual, portable and quick mercury ion detection test paper and a preparation method and application thereof. The preparation method of the test paper comprises the following steps: firstly preparing rhodamine hydrazide, carrying out etherification and Heck reaction on hydroxyl on filter paper so as to introduce in required isosulfocyanate radical end group, grafting the prepared rhodamine hydrazide onto the filter paper to finally obtain the mercury ion detection test paper. The prepared detection test paper has the advantages that a rhodamine derivative fluorescence probe and the filter paper are chemically bonded, the structure is firm, the reaction speed is high, the detection limit is 10mu m, the selectivity is good, the influences from other various coexisting ions are avoided, the detection environment is an organic-solution-free total aqueous solution system containing mercury ions, the pollution of other organic solvents to the environment is reduced; and under the irradiation of an ultraviolet lamp, the test paper can realize visual detection; the detection measures are convenient and can be performed on site; and therefore, the test paper and the preparation method of the test paper have great application prospect in the field of water pollution caused by mercury ions.
Description
technical field [0001] The invention relates to a mercury ion detection test paper and its preparation method and application, in particular to a mercury ion detection test paper based on rhodamine derivatives, which is highly selective, visualized, portable, and convenient and quick to detect, its preparation method and its application. Background technique [0002] Mercury is a very harmful environmental pollutant. The main sources of mercury pollution are various natural and man-made activities, including marine and volcanic emissions, solid waste incineration, and fossil fuel combustion. According to statistics, the total global mercury emissions from natural and human activities can reach nearly 7500 tons per year. Human beings are mainly exposed to mercury pollution through natural water, and even a very low concentration of mercury may bring serious harm to human body. Both elemental and ionic mercury can be converted into methylmercury by bacteria in the environment...
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