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Preparation method and application of sol test paper for greenly and rapidly detecting sulfur ions

A technology of sulfide ions and sols, applied in sol preparation, chemical instruments and methods, color/spectral characteristic measurement, etc., can solve the problems of consumer health and safety threats and injuries, inability to achieve rapid detection, cumbersome operation, etc., to achieve test The effect of low cost, convenient use and simple preparation method

Active Publication Date: 2019-07-19
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Sulfur dioxide is also widely used in food processing, such as sulfur fumigation and bleaching of food, but if the residual sulfur exceeds the specified content, it will cause threats and harm to the health and safety of consumers
The gravimetric method is the sulfide precipitation method, so that S 2- Lead sulfide, cadmium sulfide, copper sulfide, etc. are produced, and then acid-dissolved to form hydrogen sulfide after filtration. The iodine method is used for determination, which is cumbersome to operate and has a relatively high detection limit.
Instrumental methods include chemiluminescence, fluorescence photometry, electrochemical method, and ion chromatography-electrochemical method. These are large-scale instruments, expensive, and require professional operation.
[0008] Chinese Patent No. 2016106737364 discloses a rapid detection test paper for sulfide in water and its preparation method. It uses a paper strip soaked in a mixed solution of lead acetate and p-amino-N,N-dimethylaniline to detect water quality. The test paper can detect the water quality in 5 minutes. Rapid detection of sulfide indicators in water quality, but the detection limit can only reach 1mg / L
[0009] Chinese Patent No. 2016109425881 discloses a test paper for the detection of sulfur-containing substances. A paper strip soaked in a mixed solution of 5-25% ferric chloride solution and 1-10% potassium permanganate is used to detect sulfur ions in food for 2 hours. The detection can be completed, but the minimum detection limit is 0.1mg / L

Method used

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  • Preparation method and application of sol test paper for greenly and rapidly detecting sulfur ions
  • Preparation method and application of sol test paper for greenly and rapidly detecting sulfur ions
  • Preparation method and application of sol test paper for greenly and rapidly detecting sulfur ions

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A kind of preparation process of the sol of green rapid detection sulfur ion, comprises the steps:

[0048] (1) Weigh 0.100 g of sodium carboxymethylcellulose (CMC), add 99.9 mL of distilled water, and configure a CMC solution with a mass fraction of 0.1%, which is designated as solution A;

[0049] (2) measure 0.01moL (1.70g) silver nitrate, 0.02moL ammoniacal liquor (1.50mL25% ammoniacal liquor) and 98.5mL distilled water, be made into the silver ammonium ion solution that concentration is 0.10mol / L, record as solution B;

[0050] (3) Add 50 μL of solution B to 50 μL of solution A under stirring at room temperature, stir at 50°C for 20 minutes, then add 50 μL of ascorbic acid sodium salt (Vc) with a volume concentration of 0.12 mol / L, continue stirring for 25 minutes, and the reaction is complete After that, bright yellow CMC / AgNPs sol can be obtained.

[0051] (4) Store the prepared CMC / AgNPs sol in the dark.

[0052] The preparation process of sol test paper compr...

Embodiment 2

[0062] A kind of preparation process of the sol of green rapid detection sulfur ion, comprises the steps:

[0063] (1) Weigh 0.200g of sodium carboxymethylcellulose (CMC), add 99.8mL of distilled water to form a CMC solution with a mass fraction of 0.2%, and call it solution A;

[0064] (2) measure 0.02moL (3.40g) silver nitrate, 0.04moL ammoniacal liquor (3.00mL25% ammoniacal liquor) and 97.0mL distilled water, be made into the silver ammine ion solution that concentration is 0.20mol / L, denote as solution B;

[0065] (3) Add 80 μL of solution B to 70 μL of solution A under stirring at room temperature, stir at 80°C for 10 minutes, then add 50 μL of glucose solution with a volume concentration of 0.2 mol / L, and continue stirring for 35 minutes. After the reaction is complete, you can get Bright yellow CMC / AgNPs sol.

[0066] (4) Store the prepared CMC / AgNPs sol in the dark.

[0067] The preparation process of sol test paper comprises the steps:

[0068] (1) Dilute the prepa...

Embodiment 3

[0076] A kind of preparation process of the sol of green rapid detection sulfur ion, comprises the steps:

[0077] (1) Weigh 0.150g of sodium carboxymethylcellulose (CMC), add 99.85mL of distilled water to form a CMC solution with a mass fraction of 0.15%, and call it solution A;

[0078] (2) Measure 0.005moL (0.850g) of silver nitrate, 0.01moL of ammonia water (0.75mL of 25% ammonia water) and 99.25mL of distilled water to form a silver ammonium ion solution with a concentration of 0.05mol / L, which is designated as solution B;

[0079] (3) Add 30 μL of solution B to 40 μL of solution A under stirring at room temperature, stir at 30°C for 20 minutes, then add 50 μL of hydrazine solution with a volume concentration of 0.05 mol / L, and continue stirring for 15 minutes. A bright yellow CMC / AgNPs sol was obtained.

[0080] (4) Store the prepared CMC / AgNPs sol in the dark.

[0081] The preparation process of sol test paper comprises the steps:

[0082] (1) Dilute the prepared bri...

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Abstract

The invention discloses a preparation method of sol test paper for greenly and rapidly detecting sulfur ions, and relates to the technical field of trace sulfur ion measurement. The preparation methodcomprises preparation of CMC / AgNPs sol and the sol test paper, wherein the CMC / AgNPs sol is prepared by taking sodium carboxymethylcellulose (CMC) and a silver-ammonia complex as raw materials through an in-situ redox reaction method. The invention further discloses a method for preparing the sol test paper through coating the sol on test paper and an application of the sol test paper in the aspect of semi-quantitatively detecting S2- concentrations. The preparation method and application have the beneficial effects that the environment-friendly natural high polymer material CMC and inorganicsilver are utilized as raw materials for preparing the sol; and the prepared sol and sol test paper have high selectivity for S2-, cannot be interfered by other ions, have high sensitivity and a detection limit reaching a micron g level (greater than or equal to 7.68 micron g / L), are suitable for the rapid detection of sulfur ions in detection objects such as water and food anytime and anywhere,are environment-friendly and low in test cost, and have relatively high commercial value.

Description

technical field [0001] The invention relates to the technical field of determination of trace sulfide ions, in particular to a method for preparing a green sol test paper for rapidly detecting sulfide ions and an application thereof. Background technique [0002] Elemental sulfur is basically non-toxic, and can be used as an additive in traditional Chinese medicine and daily necessities. It is often used as a fungicide and insecticide in agriculture, and can also be used as a mercury scavenger. It has many uses. However, sulfides are very toxic, a small amount can cause headaches, and severe ones can cause death. Hydrogen sulfide is a strong neurotoxin and has a strong stimulating effect on mucous membranes. Low concentrations of hydrogen sulfide can irritate the respiratory tract and eyes, and cause headaches. When the concentration reaches 1mg / L or higher, it is life-threatening. When the concentration is 0.00041mg / L, the odor can be smelled, when the concentration is 12...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31B01J13/00
CPCG01N21/78G01N21/314B01J13/0004G01N2021/775G01N2021/7759
Inventor 李子超薛云李群邓宇甲谭艳丽庞雪宁
Owner QINGDAO UNIV
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