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Quick test paper for hardness of water

A technology for testing test paper and hardness, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials. Problems such as short shelf life of paper strips, to achieve the effect of shortening the production cycle, easy to determine the results, and the effect is not affected

Inactive Publication Date: 2015-11-18
FUDEAN OF BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the Chinese patent of patent 991116933 has announced "a kind of total water hardness test paper", and there is also a patent 011323833 which has announced "a kind of water quality total hardness test paper and its preparation method", but they all have strict requirements on users and are easy to bring various operational errors. , or the color change is not obvious, due to the difference in the ability of human eyes to distinguish colors, the error is large, which cannot meet the requirements for water hardness testing
The use of test paper technology to detect water hardness requires obvious color changes, rapid response, and simple operation, but none of the existing test papers can meet the requirements; in addition, the existing test papers have the problems of short shelf life and easy pollution. How to extend the test papers The storage period also needs to be studied; the existing test strips generally use some toxic preservatives such as sodium azide, which will undoubtedly cause harm to the environment and operators. Therefore, it is necessary to find a sensitive, short response time, production A technology with short cycle time, considerable stability and shelf life, and strong market competitiveness for rapid detection of water hardness

Method used

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  • Quick test paper for hardness of water
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  • Quick test paper for hardness of water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First configure the reaction solution, the solvent in the reaction solution is 50% ethanol, the pH value is adjusted to 10 with citric acid buffer solution, the solute is chrome black T of 0.5-0.7g / L and alizarin of 0.2-0.4g / L, and Add 5-10g / L dispersant and protective agent PVP and 0.5-1mg / L antioxidant grapefruit seed extract (GSE). Soak the 3mm chromatography filter paper in the reaction solution for 10s, and dry it for 45min under the environment of vacuum degree 100Pa and temperature 45°C. Adhere the treated filter paper on the substrate and cut it into 0.55cm×7cm test strips. Sealed and stored in a dry environment at 4°C, and should not be exposed to direct sunlight.

Embodiment 2

[0030] Take 20 samples of well-known brand mineral water purchased from supermarkets, respectively take appropriate amount of samples in clean dry containers, take the chromogenic film area of ​​the immersion test paper as the standard, take it out immediately after immersion, and place the chromogenic film horizontally with the chromogenic film facing up. After 3s a semi-quantitative reading is performed. Compare the color of the test paper with the standard color chart, and the value corresponding to the same color scale as the color scale of the color chart is the detection value of the sample. If the color of the test paper is between the two color scales, take the middle value of the two . The hardness of the 20 mineral water samples was measured to be 25mg / L, which was a qualified sample.

Embodiment 3

[0032] Take 5 samples of lake water in the park, take an appropriate amount of sample liquid in a clean dry container, take it out immediately after immersion, place the chromogenic chip horizontally, and take a semi-quantitative reading after 3s. Compare the color of the test paper with the standard color chart, and the value corresponding to the same color scale as the color scale of the color chart is the detection value of the sample. If the color of the test paper is between the two color scales, take the middle value of the two . The hardness of 5 lake water samples was measured to be 150mg / L, which is suitable for fish to survive.

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Abstract

The invention relates to quick test paper for the hardness of water and belongs to the field of water quality testing. The quick test paper is only composed of a paper base and a color developing paper sheet, and the structure and operation are very simple. Chromatography filter paper of 3 mm serves as a carrier, and thus the test paper can quickly carry out semi-quantitative testing on the hardness of water within 3 s. The optimal manufacturing technology is selected, and the production period of the test paper is greatly shortened. A dispersing agent and a protecting agent are added, and the stability of the test paper is improved. A natural antibacterial antioxidant is added, toxic and side effects are avoided, and the testing time of the test paper is prolonged. A detection conclusion can be obtained through vision observation, a precision instrument for display is not needed, and a user can master the test paper without specialized training. Meanwhile, the quick test paper is cheap in price, low in production cost, disposable, free of overhaul and maintenance, high in accuracy, good in repeatability and very suitable for supervision departments to carry out field real-time quick testing and monitoring.

Description

technical field [0001] The invention relates to a fast, sensitive, convenient and long-term storage test paper for detecting the hardness of water, which belongs to the water quality detection technology. Background technique [0002] Hardness is an important indicator of water quality. It is composed of calcium and magnesium. Since hardness is not formed by a single metal ion or salt, it is necessary to convert it to another salt in order to have a unified comparison standard. Usually use CaO or CaCO 3 represented by mass concentration. Now that the social economy is developing faster and faster, people are paying more and more attention to the environment and quality of life. Among them, the impact of water hardness on industrial production, environmental monitoring and domestic water has attracted people's attention. [0003] The traditional detection methods of water hardness can be roughly divided into chemical analysis methods and instrumental analysis methods. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 许文涛陈玉婷翟百强程楠黄昆仑董凯
Owner FUDEAN OF BEIJING TECH
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