A kind of rapid detection test paper of trace chromium and preparation method thereof

A test paper and micro-quantity technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of repeatability and accuracy of measurement, and achieve reproducibility Good, easy to carry, easy to prepare

Inactive Publication Date: 2016-11-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of these kinds of chromium test paper are to absorb several solutions on the adsorption material by dipping. These methods are difficult to ensure that the concentration of the measurement solution absorbed each time is exactly the same, and the repeatability and accuracy of the measurement are affected.

Method used

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  • A kind of rapid detection test paper of trace chromium and preparation method thereof
  • A kind of rapid detection test paper of trace chromium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 . Prepare the test paper as described in the general preparation method using medium-speed qualitative filter paper as the water-absorbing material.

[0023] Dissolve 0.1845g of diphenylcarbazide in 10g of acetone, and add 0.5366g of cellulose acetate after complete dissolution to form a membrane solution. The membrane solution contains 0.060 mol / l of diphenylcarbazide and 5 wt% of cellulose acetate.

[0024] Add cetyltrimethylammonium bromide to make the concentration 0.01 mol / l.

[0025] Add analytically pure hydrochloric acid dropwise into the membrane solution to make the concentration 0.3 mol / l.

[0026] Take a medium-speed qualitative filter paper of 11.0×16.0 cm and spread it on a glass plate, and use a glass rod to evenly scrape the prepared membrane solution on the surface of the filter paper. After the filter paper is protected from light and dried, use a glass rod to evenly spread the membrane solution on the other side of the filter paper. Aft...

Embodiment 2

[0029] Example 2 . Prepare the test paper as described in the general preparation method using medium-speed qualitative filter paper as the water-absorbing material.

[0030] Dissolve 0.2102g of diphenylcarbazide in 10g of acetone, and add 0.6700g of cellulose acetate after complete dissolution to form a membrane solution. The membrane liquid contains 0.068 mol / l of diphenylcarbazide and 6 wt% of cellulose acetate.

[0031] Add cetyltrimethylammonium bromide to make the concentration 0.02 mol / l.

[0032] Add analytically pure hydrochloric acid dropwise into the membrane solution to make the acid concentration 0.4 mol / l.

[0033] Take a medium-speed qualitative filter paper of 11.0×16.0 cm and spread it on a glass plate, and use a glass rod to evenly scrape the prepared membrane solution on the surface of the filter paper. After the filter paper is protected from light and dried, use a glass rod to evenly spread the membrane solution on the other side of the filter paper. ...

Embodiment 3

[0036] Example 3. A4 printing paper was used as the water-absorbent material to prepare test pieces as described in the general preparation method.

[0037] Dissolve 0.2306g of diphenylcarbazide in 10g of acetone, and add 0.7512g of cellulose acetate butyrate after complete dissolution to form a film solution. The solution contains 0.075 mol / l of diphenylcarbazide and 7 wt% of cellulose acetate.

[0038] Sodium cetylbenzenesulfonate was added to make the concentration 0.03 mol / l.

[0039] Add analytically pure acetic acid dropwise into the membrane solution to make the acid concentration 0.5 mol / l.

[0040] Take the A4 printing paper and spread it on the glass plate, use the glass rod to evenly scrape the prepared film solution on the printing paper side, after the printing paper is dry, use the glass rod to evenly scrape the prepared film solution on the printing paper The other side. After the printing paper is dry, apply the prepared hydrochloric acid solution evenly o...

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Abstract

The invention provides a test paper for detecting trace amounts of chromium in a sample and a preparation method thereof. The test paper is uniformly coated with a layer of film liquid on both sides of a water-absorbing material, and the film liquid includes diphenylcarbazide, cellulose, surface Active agent, acidity regulator, acetone solvent. The preparation method of the invention is easy to operate, the prepared test paper is cheap, and can quickly detect trace amounts of chromium in a sample on site. At the same time, the invention overcomes the shortcomings of the dipping method, can strictly control the adsorption amount of the detection reagent on each test paper, increases the firmness of the detection reagent adsorption, and improves the accuracy and reproducibility of detection.

Description

technical field [0001] The invention relates to the detection technology of trace elements, in particular to a rapid detection test paper for trace chromium and a preparation method thereof. Background technique [0002] Chromium compounds are toxic to animals and plants, among which hexavalent chromium is the most toxic, almost 100 times more toxic than trivalent chromium. Chromium exposure to the skin can lead to sensitivity, more likely to cause genetic defects, long-term inhalation may also cause cancer, and has a long-lasting danger to the environment. The pollution of hexavalent chromium mainly comes from the chromium-containing waste gas, waste water and waste residue discharged from electroplating, tanning, pigments, paints, alloys, printing and dyeing and printing industries. [0003] In order to control and control hexavalent chromium pollution, researchers have established many methods for the determination of trace chromium over the years. Chromium detection me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 周开梅岑宏宇王娅王晋春黄征青
Owner HUBEI UNIV OF TECH
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