Method for detecting metal ions in aqueous solution based on refractive index change rate

A technology of refractive index and aqueous solution, which is applied in the field of heavy metal detection, can solve problems such as detection of metal ions that have not yet been seen, and achieve the effect of simple operation, short time consumption and less acquisition

Active Publication Date: 2021-10-01
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the detection of metal io

Method used

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  • Method for detecting metal ions in aqueous solution based on refractive index change rate
  • Method for detecting metal ions in aqueous solution based on refractive index change rate
  • Method for detecting metal ions in aqueous solution based on refractive index change rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]1. Draw the refractive index-sodium chloride concentration curve at 20°C: configure the solvent as pure water in sequence, and the concentration is 0, 0.1g / L, 0.2g / L, 0.5g / L, 1.0g / L, 2.0g / L L, 5.0g / L, 10.0g / L, 20.0g / L, 40.0g / L, 60.0g / L, 80.0g / L, 100.0g / L sodium chloride aqueous solution, measured by Abbe refractometer Refractive index at 20°C, draw the curve and fit it with n=a+Δn*c model to get Δn(Na + );

[0046] Repeat the above operations, draw the curves of refractive index-potassium chloride, refractive index-magnesium chloride, refractive index-calcium chloride, refractive index-copper chloride, refractive index-aluminum chloride, and refractive index-ferric chloride successively, with n =a+Δn*c model fitting to get Δn(K + ), Δn(Mg 2+ ), Δn(Ca 2+ ), Δn(Cu 2+ ), Δn(Al 3+ ), Δn(Fe 3+ ), the summary results are shown in Table 1;

[0047] the solution linear fit R 2

Δn NaCl y=1.33279+0.000167455x 0.99612 0.000167455±3.01488·10 -6

...

Embodiment 2

[0055] 1. The steps are the same as Example 1

[0056] 2. Pretreat the sample to be tested (a chlorinated saline solution), and use TDS to measure its solid content concentration (the original concentration of the sample to be tested is 50g / L);

[0057] 3. Draw the refractive index-concentration curve of the sample to be tested at 20°C: dilute the sample to be tested 10 times and 100 times in turn, and dilute it 10 times (5g / L) as it is (50g / L), and dilute it 100 times (0.5 g / L) as the experimental group, the Abbe refractometer was used to measure its refractive index at 20°C, the refractive index was 1.34303, 1.33340, 1.33247 in turn, and the curve was drawn and fitted with n=a+Δn*c model to obtain Δn =2.13604·10 -4 ;Such as image 3 shown.

[0058] 4. Match the Δn of the sample to be tested with the Δn of various known solutions in Table 1, and it can be determined that the sample to be tested is a copper chloride solution;

[0059] 5. Step 3 measures the content of the ...

Embodiment 3

[0061] 1. The steps are the same as Example 1

[0062] 2. Pretreat the sample to be tested (a chlorinated saline solution), and use TDS to measure its concentration (the original concentration of the sample to be tested is 2g / L);

[0063] 3. Draw the refractive index-concentration curve of the sample to be tested at 20°C: Dilute the sample to be tested by 2 times, 4 times, and 10 times in sequence, and dilute it as it is (2g / L), dilute it by 2 times (1g / L), and dilute it by 4 times. times (0.5g / L), diluted 10 times (0.2g / L) as the experimental group, using the Abbe refractometer to measure its refractive index at 20 ℃, the refractive index is 1.3328, 1.33257, 1.33237, 1.3323, and draw The curve is fitted with n=a+Δn*c model to get Δn=2.82731·10 -4 ±2.38136·10 -5 ;Such as image 3 shown.

[0064] 4. Match the Δn of the sample to be tested with the Δn of various known solutions in Table 1, and it can be determined that the sample to be tested is an aluminum chloride solution...

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Abstract

The invention relates to a method for detecting metal ions in an aqueous solution based on the refractive index change rate, and belongs to the heavy metal detection technology. The method comprises the following steps: (1) drawing a refractive index-salt concentration curve of a plurality of metal salt standard solutions to obtain refractive index change rate Deltan of each metal salt solution, namely a series of Deltan corresponding to the plurality of metal salt standard solutions; (2) taking a to-be-detected aqueous solution sample, and detecting the content of soluble substances by taking g/L as a unit; and (3) drawing a refractive index-salt concentration curve of a to-be-detected aqueous solution sample to obtain a refractive index change rate Deltan(s) of the to-be-detected sample; and (4) matching the Deltan(s) with a series of Deltan obtained in the step (1), so that the matched metal types in the metal salt standard solution are the metal types in the to-be-detected aqueous solution sample, and qualitative detection is realized. The detection requirements under sudden or emergency conditions can be met in a targeted manner.

Description

technical field [0001] The invention relates to heavy metal detection technology, in particular to a method for detecting metal ions in aqueous solution based on the refractive index change rate. [0002] technical background [0003] With the advancement of industry and urbanization, people's lives are becoming more and more convenient, while pollution is also becoming more and more serious, among which heavy metal pollution cannot be ignored. Heavy metals will not only pollute surface water through runoff and leaching, but also enter the human body through the food chain. It is difficult for the human body to metabolize the accumulation of heavy metals, and eventually directly or indirectly endanger the health of human organs. [0004] Conventional heavy metal detection methods mainly include ultraviolet spectrophotometry (UV), atomic fluorescence spectrometry (AFS), atomic absorption spectrometry (AAS), inductively coupled plasma emission spectrometry (ICP), etc. These met...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 晏波刘骏龙陈涛黄祖率
Owner SOUTH CHINA NORMAL UNIVERSITY
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