Test paper for determining total chlorine, preparation method of test paper and method for rapidly determining total chlorine

A test paper and stabilizer technology, applied in the field of analytical chemistry, can solve the problems of prolonging the measurement time, limited application range, low sensitivity, etc., and achieve the effects of improving response time, saving test cost, and wide detection range

Pending Publication Date: 2022-04-29
广东环凯生物技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has high sensitivity and the minimum detection concentration is 0.10mg / L, but the shelf life of the test paper is generally only half a year; the latter has a shelf life of up to one year, but the sensitivity is not high, the minimum detection concentration is generally not lower than 0.50mg / L, and cannot be used for tap water, medical Water samples with low total chlorine content such as permeate water are tested, and the application range is limited
In addition, it generally takes 3 to 10 minutes for the total chlorine test paper on the market to develop color, prolonging the measurement time

Method used

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  • Test paper for determining total chlorine, preparation method of test paper and method for rapidly determining total chlorine
  • Test paper for determining total chlorine, preparation method of test paper and method for rapidly determining total chlorine

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preparation example Construction

[0019] The invention provides a kind of preparation method for the determination test paper of total chlorine, comprising steps:

[0020] (1) dissolving the color developer and the pH regulator in the solvent A to prepare the impregnating solution A;

[0021] (2) Dissolving the wetting agent, stabilizer and film-forming agent in solvent B to prepare impregnation solution B;

[0022] (3) Soak the filter paper in the soaking solution A for the first time, take it out and dry it, put it in the soaking solution B for the second soaking, take it out, dry it, cut it, and paste it on the substrate;

[0023] The developer includes thio-Michler ketone or a compound having a similar active structure to thio-Michler ketone; the wetting agent is selected from nonionic fluorosurfactants, and the stabilizer is thioglycolate alkali metal Salt.

[0024] Preferably, the pH regulator is selected from solid organic acids. Further, the pH regulator is selected from at least one of citric acid ...

Embodiment 1

[0043] A preparation method for measuring test paper for total chlorine, comprising steps:

[0044] (1) Preparing liquid A containing 0.95g / L thio-Michler's ketone and 1.8g / L citric acid monohydrate with absolute ethanol;

[0045] (2) Use pure water to prepare impregnation solution B containing 12.5ml / L perfluorooctyl polyoxyethylene ether fluorosurfactant (based on effective content of 20%), 3g / L sodium thioglycolate, and 4g / L sodium polyacrylate ;

[0046] (3) Soak the chromatographic filter paper completely in the above impregnation solution A for 10 minutes, take it out and dry it under vacuum at 55°C; after drying the chromatographic filter paper, soak it completely in the impregnation solution B for 10 seconds, take it out and dry it under vacuum at 55°C Set aside to dry. After the chromatographic filter paper is dried, cut the filter paper into small pieces of 5 × 5 mm, and glue it to one end of a 5 × 75 mm strip-shaped bottom plate to obtain a test paper for the dete...

Embodiment 2

[0048] A preparation method for measuring test paper for total chlorine, comprising steps:

[0049] (1) Preparing liquid A containing 2.5g / L thio-Michler's ketone and 2.0g / L malic acid with absolute ethanol;

[0050] (2) Prepare impregnating solution B containing 14ml / L perfluoroacrylate fluorosurfactant (calculated as effective content 20%), 3.4g / L potassium thioglycolate, and 7.0g / L gum arabic with pure water;

[0051] (3) Soak the chromatographic filter paper completely in the above impregnation solution A for 10 minutes, take it out and dry it under vacuum at 55°C; after drying the chromatographic filter paper, soak it completely in the impregnation solution B for 10 seconds, take it out and dry it under vacuum at 55°C Set aside to dry. After the chromatographic filter paper is dried, cut the filter paper into small pieces of 5 × 5mm, and glue it on one end of a strip-shaped bottom plate of 5 × 75mm to obtain the test paper for the determination of total chlorine, referre...

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Abstract

The invention provides test paper for measuring total chlorine, a preparation method of the test paper and a method for rapidly measuring the total chlorine, and the preparation method of the test paper comprises the following steps: (1) dissolving a color developing agent and a pH regulator in a solvent A to prepare steeping liquor A; (2) dissolving a wetting agent, a stabilizing agent and a film-forming agent in a solvent B to prepare impregnation liquid B; (3) soaking filter paper in the steeping liquor A for the first time, taking out and drying the filter paper, then soaking the filter paper in the steeping liquor B for the second time, taking out, drying and cutting the filter paper, and pasting the filter paper on a substrate; the color developing agent comprises thiomichler's ketone or a compound with an active structure similar to that of the thiomichler's ketone; the wetting agent is selected from a nonionic fluorine surfactant; the stabilizer is mercaptoacetic acid alkali metal salt. The test paper for measuring total chlorine, prepared by the preparation method disclosed by the invention, has the advantages of high sensitivity, obvious color gradation, wide detection range, simplicity and convenience in operation and long shelf life.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a test paper for measuring total chlorine, a preparation method thereof and a method for quickly measuring total chlorine. Background technique [0002] Total chlorine refers to the free residual chlorine in water (including Cl 2 , ClO - , HClO) and combined residual chlorine (monochloramine, dichloramine, trichloramine). The amount of chlorine added to water can be divided into two parts, namely chlorine demand and residual chlorine. Chlorine demand refers to the part consumed to kill bacteria, oxidize organic matter and reducing substances, and residual chlorine refers to the part used to inhibit the growth and reproduction of bacteria. When the water is mainly polluted by bacteria, organic matter and reducing substances, without ammonia nitrogen and nitrogen compounds, after adding chlorine disinfectant (not including chlorine dioxide), the residual chlorine is mainly fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/01
CPCG01N21/78G01N21/01G01N2021/0112
Inventor 李俊恒陈志勇邓金花秦惠秦小娃
Owner 广东环凯生物技术有限公司
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