Method for detecting trace copper in wastewater rapidly

A waste water, rapid technology, applied in the field of analytical chemistry, can solve the problems of expensive instruments and consumables, difficulty in general application, low detection limit, etc., and achieve the effect of easy observation, simple operation method and wide detection range

Inactive Publication Date: 2012-06-27
KUNMING FURUITE TRADE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combination of DLLME and various chromatographic techniques and spectroscopic techniques can achieve very low detection limits, but the instruments and co

Method used

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  • Method for detecting trace copper in wastewater rapidly

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Effect test

Embodiment 1

[0023] ① Mix 5mL of mineral waste water with Cu 2+ Put 5 mL each of the standard series of solutions in centrifuge tubes with stoppers, add 1 mL of DDTC-Na solution with a concentration of 30 μg / mL to each centrifuge tube, and adjust the pH to 5 with acetic acid-sodium acetate buffer solution; Mix carbon chloride and 0.5mL acetone; ③Use a syringe to absorb the mixed solution in step ②, quickly pour it into the centrifuge tube in step ①, and ultrasonicate at 35kHz for 10min to form a uniform emulsified system; ④put the centrifuge tube in step ③ at 6000 Centrifuge under the condition of 5min / min, break the emulsion, the extractant forms a drop at the bottom of the centrifuge tube, and the DDTC-Cu complex is extracted into this drop of extractant; ⑤ Under the same conditions, the mineral waste water forms a yellow drop at the bottom of the centrifuge tube Comparing the color scale of a drop of solution formed by the solution and the standard series of solutions, the color of a dr...

Embodiment 2

[0025] ① Mix 5mL of industrial wastewater with Cu 2+ Put 5 mL each of the standard series of solutions in centrifuge tubes with stoppers, add 1 mL of DDTC-Na solution with a concentration of 20 μg / mL to each centrifuge tube, and adjust the pH to 5 with acetic acid-sodium acetate buffer solution; ② Add 100 μL of chloroform Mix with 0.5mL acetonitrile; ③Use a syringe to absorb the mixed solution in step ②, quickly pour it into the centrifuge tube in step ①, and ultrasonicate at 50kHz for 4min to form a uniform emulsion system; ④Put the centrifuge tube in step ③ at 4000r / min Centrifuge for 7 minutes to break the emulsion, and the extractant forms a drop at the bottom of the centrifuge tube, and the DDTC-Cu complex is extracted into this drop of extractant; ⑤Under the same conditions, the industrial wastewater forms a drop of yellow solution and standard The color scale comparison of a drop of solution formed by a series of solutions shows that the color of a drop of waste water i...

Embodiment 3

[0027] ① Mix 5mL domestic wastewater with Cu 2+ Put 5 mL each of the standard series of solutions into centrifuge tubes with stoppers, add 1 mL of DDTC-Na solution with a concentration of 25 μg / mL to each centrifuge tube, and adjust the pH to 5 with acetic acid-sodium acetate buffer solution; ② Add 100 μL of two Mix the methyl chloride and 0.5mL Triton X-100; ③ Draw the mixed solution in step ② with a syringe, quickly pour it into the centrifuge tube in step ①, and ultrasonicate at 40kHz for 6min to form a uniform emulsified system; ④ put the centrifuge tube in step ③ Centrifuge at 8000r / min for 5 minutes to break the emulsion, and the extractant forms a drop at the bottom of the centrifuge tube, and the DDTC-Cu complex is extracted into this drop of extractant; Comparing the color scale of a drop of yellow solution and a drop of standard series solution, the color of a drop of waste water is between the color of 10-15μg / L standard copper solution, and the color of industrial ...

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Abstract

The invention discloses a method for detecting trace copper in wastewater rapidly. The method comprises the steps of: firstly, reacting copper and sodium diethyldithiocarbamate trihydrate (DDTC-Na), separating and enriching Cu-DDTC complexes in a sample by using dispersive liquid liquid microextraction (DLLME) to form yellow complexes which are enriched at a lower part of an ionic tube, comparing a standard copper content, detecting the trace copper in the sample, wherein the detection limit is 5 mu g/L. The method disclosed by the invention is simple to operate, high in detection sensitivity, easy for observation due to the colorless complexing agent (DDTC) and short in detection time, can be used for determining the trace copper without complex equipment, is a simple, convenient, rapid and accurate analysis method, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a new method for rapidly detecting trace copper in waste water. Background technique [0002] Heavy metal elements will have an impact on the ecological environment and human health, and it is becoming increasingly important to accurately detect heavy metal elements in environmental samples. Copper is an important heavy metal element that is toxic to ecological organisms such as algae, fungi, bacteria, and viruses. Copper is also suspected of causing liver damage in infants and young children. Mineral wastewater, industrial wastewater, and domestic wastewater are all possible sources of copper. [0003] The concentration of trace elements in wastewater is very low and the matrix interference cannot be completely eliminated. The determination of copper in wastewater also has the problems of matrix interference and low concentration (sometimes at the μg / L level), so the sample ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28
Inventor 郑伟邢伯杨郑天宇杨亚玲
Owner KUNMING FURUITE TRADE
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