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Automatic analysis of cadmium and mercury in seawater, surface water and sewage

A technology for automatic analysis of industrial sewage, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of high analysis cost and achieve the effect of high analysis precision, fewer flow paths, and lower manufacturing cost

Inactive Publication Date: 2008-10-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this analysis method can make the analysis instrument miniaturized, it can conveniently carry out on-line automatic analysis of trace metal elements in seawater and estuary water, but the analysis cost is still relatively high due to the need to process the sample and use low-pressure ion chromatography for analysis. High, about 20 minutes for one analysis

Method used

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  • Automatic analysis of cadmium and mercury in seawater, surface water and sewage
  • Automatic analysis of cadmium and mercury in seawater, surface water and sewage
  • Automatic analysis of cadmium and mercury in seawater, surface water and sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Analysis of cadmium in seawater

[0024] 1. Preparation of standard samples

[0025] Weigh cadmium chloride (CdCl 2 2.5H 2 O) 0.203lg, dissolved in a small amount of water, transferred to a 100ml volumetric flask, diluted with water to the mark, and prepared as a stock solution with a concentration of 1.00mg / ml. Dilute the stock solution and prepare a series of standard samples. The concentration of cadmium in each standard sample is 1.00 μg / L, 2.00 μg / L, 4.00 μg / L, 8.00 μg / L, and 10.00 μg / L.

[0026] 2. Reaction solution R1 Cd preparation

[0027] Take potassium iodide, ascorbic acid and be mixed with 20% potassium iodide-2% ascorbic acid stock solution for subsequent use, pipette 4.5mol / L H 2 SO 4 In a volumetric flask, add 20% potassium iodide-2% ascorbic acid stock solution, then add polyvinyl alcohol and citric acid, and finally dilute with water. In the prepared reaction solution, the weight / volume percentage of potassium iodide is 5%, and the ...

Embodiment 2

[0039] Example 2: Analysis of Cadmium in Surface Water

[0040] 1. Preparation of standard samples

[0041] Same as Example 1.

[0042] 2. Reaction solution R1 Cd preparation

[0043] Take potassium iodide, ascorbic acid and be mixed with 20% potassium iodide-2% ascorbic acid stock solution for subsequent use, pipette 4.5mol / L H 2 SO 4 In a volumetric flask, add 20% potassium iodide-2% ascorbic acid stock solution, then add polyvinyl alcohol and citric acid, and finally dilute with water. In the prepared reaction solution, the weight / volume percentage of potassium iodide is 3%, and the weight / volume percentage of ascorbic acid The percentage is 0.3%, the weight / volume percentage of polyvinyl alcohol is 0.3%, the weight / volume percentage of citric acid is 0.3%, the concentration of sulfuric acid is 8×10 -3 mol / L.

[0044] 3. Preparation of chromogenic solution

[0045] Weigh 0.03 g of ethyl violet into a volumetric flask, dilute with water so that the weight / volume perce...

Embodiment 3

[0055] Embodiment 3: analyze the cadmium in the industrial sewage

[0056] 1. Preparation of standard samples

[0057] Same as Example 1.

[0058] 2. Reaction solution R1 Cd preparation

[0059] Take potassium iodide, ascorbic acid and be mixed with 20% potassium iodide-2% ascorbic acid stock solution for subsequent use, pipette 4.5mol / L H 2 SO 4 In a volumetric flask, add 20% potassium iodide-2% ascorbic acid stock solution, then add polyvinyl alcohol and citric acid, and finally dilute with water. In the prepared reaction solution, the weight / volume percentage of potassium iodide is 6%, and the weight / volume of ascorbic acid The percentage is 0.5%, the weight / volume percentage of polyvinyl alcohol is 0.5%, the weight / volume percentage of citric acid is 0.4%, and the concentration of sulfuric acid is 6×10 -3 mol / L.

[0060] 3. Preparation of chromogenic solution

[0061] Weigh 0.03 g of ethyl violet into a volumetric flask, dilute with water so that the weight / volume p...

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Abstract

A method for automatically analyzing Cd and Hg in sea water, surface water and industrial waste water includes applying flow - injecting analysis and spectrophotometric detection, using NaCI solution as driving liquid, using mixed liquid of potassium iodide - ascorbic acid - poval - citrin or citrol as reaction liquid, using ethyl purple solution as color display liquid; using above said liquids to react with samples for generating spectrogram to be plotted.

Description

technical field [0001] The invention belongs to an analysis method for cadmium and mercury contained in seawater, surface water and industrial sewage, in particular to an automatic analysis method. Background technique [0002] Cadmium and mercury are accumulative poisons that are harmful to the human body and have strong teratogenic, carcinogenic, and mutagenic effects, so they are used as routine monitoring items for environmental water bodies. Regarding the analysis methods of cadmium and mercury in seawater, surface water and industrial sewage, currently foreign countries mainly use inductively coupled plasma emission spectrometry (ICP) and inductively coupled plasma emission spectrometry-mass spectrometry (ICP-MS). In addition to the above methods, manual colorimetry is also used. ICP method and ICP-MS combined method are not only expensive in terms of analytical instruments, but also difficult to use on-site on-line analysis. Although the analysis cost of manual colo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 张新申蒋小萍
Owner SICHUAN UNIV