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Method of detecting hexavalent chromium by nitrogen-phosphorus doped carbon quantum dot probe

A carbon quantum dot and probe detection technology, applied in the field of hexavalent chromium detection, can solve problems such as inaccurate detection results, and achieve the effects of strong anti-interference ability, high sensitivity and strong electrical polarity

Active Publication Date: 2017-12-01
深圳市威标检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the detection of hexavalent chromium is easily interfered by ferric iron, trivalent chromium, and hexavalent molybdenum. When the above-mentioned substances exist in the solution, the detection results are often inaccurate. The above-mentioned substances in the environment are ubiquitous, so a study It can detect the concentration of hexavalent chromium sensitively, and can avoid the interference of environmental factors. It is of great significance to prepare to measure the concentration of hexavalent chromium

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  • Method of detecting hexavalent chromium by nitrogen-phosphorus doped carbon quantum dot probe

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Embodiment 1

[0037] A method for detecting hexavalent chromium using nitrogen and phosphorus doped carbon quantum dot probes, comprising the following steps:

[0038] Step 1, using a PBS buffer solution with a pH of 7.4 to prepare a nitrogen-phosphorus-doped carbon quantum dot solution with a concentration of 0.5 mg / mL, and using a PBS buffer solution with a pH of 7.4 to prepare a plurality of hexavalent chromium standard solutions with different concentrations, the hexavalent chromium The concentrations of the chromium standard solution are: 0, 1×10 -6 mol / L, 3×10 -6 mol / L, 5×10 -6 mol / L, 7×10 -6 mol / L, 9×10 -6 mol / L, 1.2×10 -5 mol / L, 1.5×10 -5 mol / L, 1.8×10 -5 mol / L, 2.1×10 -5 mol / L, 2.4×10 -5 mol / L, 2.7×10 -5 mol / L, 3.0×10 -5 mol / L, 3.3×10 -5 mol / L, 3.6×10 -5 mol / L, 3.9×10 -5 mol / L, 4.2×10 - 5 mol / L, 4.5×10 -5 mol / L, and 4.8×10 -5 mol / L, measure 19 parts of nitrogen-phosphorus-doped carbon quantum dot solution with a volume of 3ml, add a part of hexavalent chromium stan...

Embodiment 2

[0041] The determination procedure is the same as in Example 1, wherein the difference is the preparation method of nitrogen and phosphorus doped carbon quantum dots in step one, the preparation method of nitrogen and phosphorus doped carbon quantum dots solution, the preparation method of hexavalent chromium standard solution, and the preparation method containing hexavalent chromium The pretreatment of the solution to be tested of valence chromium is different, specifically as follows:

[0042] The preparation method of nitrogen and phosphorus doped carbon quantum dots is specifically as follows:

[0043] S1. Crush the hydrotalcite through a 120-mesh sieve, place it in tartaric acid, and heat it in a water bath at 30°C, 60°C, 90°C, and 30°C. The water bath time is 10min, 20min, 30min, and 10min, respectively. Wash the first precipitate with deionized water for 3 times, put it in the carbon tetrachloride solution of soybean lecithin and ultrasonically treat it for 20-30 minut...

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Abstract

The invention discloses a method of detecting hexavalent chromium by a nitrogen-phosphorus doped carbon quantum dot probe. The method includes step 1, mixing the hexavalent chromium with a PBS buffer solution, dripping a sodium nitrite solution, putting a positive-electrode output end and a negative-electrode input end below the liquid level, preparing standard hexavalent chromium solutions through currents, mixing nitrogen-phosphorus doped carbon quantum dots with the PBS buffer solution, refrigerating the mixed liquor for 30 minutes, performing ultrasonic treatment, refrigerating the mixed liquor for another 30 minutes, irradiating the mixed liquor by ultraviolet rays to obtain a nitrogen-phosphorus doped carbon quantum dot solution, adding the standard hexavalent chromium solutions with different concentrations into the nitrogen-phosphorus doped carbon quantum dot solution, irradiating the mixed solution by exciting light, and creating a relationship between hexavalent chromium concentration and fluorescent intensity; step 2, irradiating a to-be-detected solution by the exciting light, and detecting corresponding fluorescent intensity of the to-be-detected solution, and reading the corresponding concentration of the hexavalent chromium in the to-be-detected solution according to the relationship, detected in the step 1, between the hexavalent chromium concentration and the fluorescent intensity. The method has the advantages of detection sensitivity, high anti-interference capability and high detection accuracy.

Description

technical field [0001] The invention relates to the field of detection of hexavalent chromium. More specifically, the present invention relates to a method for detecting hexavalent chromium using nitrogen and phosphorus doped carbon quantum dot probes. Background technique [0002] In the past few decades, with the rapid development of industry, the discharge of harmful substances into the environment has been increasing. For example, Cr(VI), Cr(VI) is carcinogenic and extremely harmful to humans. Therefore, it is of great significance to develop a simple and fast method to detect Cr(VI) in the environment. According to the regulations of the U.S. Environmental Protection Agency: the maximum allowable Cr(VI) concentration in drinking water is 0.1mg / L. In order to detect and ensure the quality of drinking water and reduce the discharge of harmful substances, there is an urgent need for a product with good selectivity and high sensitivity. And it is an analytical method that...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643
Inventor 黄珊肖琦杨二利刘义
Owner 深圳市威标检测技术有限公司