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Method for determination of aluminum ion content by alizarin red S complexation spectrophotometry

A technology of spectrophotometry and aluminum ions, which is applied in the field of analysis and detection, can solve the problems of high cost, long period, and cumbersome test procedures, and achieve the effects of good reproducibility and precision, simple operation, and a wide range of concentration concentrations

Active Publication Date: 2014-08-20
甘肃伊牧兰肉类加工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and the shortcomings of the national standard method, which are cumbersome, long-term, and high-cost, and provide a simple reaction system, high sensitivity, accurate test results, and meet the precision requirements. Method for Determination of Aluminum Ion Content by UV-Vis Spectrophotometry of Complexation Reaction

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  • Method for determination of aluminum ion content by alizarin red S complexation spectrophotometry
  • Method for determination of aluminum ion content by alizarin red S complexation spectrophotometry
  • Method for determination of aluminum ion content by alizarin red S complexation spectrophotometry

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Embodiment 1

[0029] Example 1: Pre-preparation of solutions

[0030] 1. Preparation of Alizarin Red S solution (0.25g / L) Weigh 0.025g of Alizarin Red S, dissolve in 50mL of absolute ethanol, dilute with distilled water to 100mL.

[0031] 2. Preparation of aluminum ion standard solution (1.0mg / mL): weigh 0.89g AlCl 3 .6H 2 O (aluminum content is 0.1g), dissolved in deionized water and adjusted to 100mL.

[0032] 3. Preparation of disodium hydrogen phosphate-citric acid buffer solution (pH4.6): Accurately pipette 46.75 mL of 0.2 mol / L disodium hydrogen phosphate solution and 53.25 mL of 0.1 mol / L citric acid solution, and mix to 100 mL.

Embodiment 2

[0033] Embodiment 2: Determination of reaction system and maximum absorption peak

[0034] The natural color of Alizarin Red S solution is yellow. In the acidic medium of disodium hydrogen phosphate-citric acid at pH 4.6, it forms a stable complex water-soluble substance with a certain concentration of aluminum ions. The color is red. Before and after the solution was scanned at full wavelength, the results are shown in figure 1 with figure 2 .

[0035] figure 1 The results showed that the maximum light absorption peak of Alizarin Red S solution was at 420nm, figure 2 The results showed that the maximum absorption peak of the solution was at 490nm after reacting with aluminum ions.

[0036] Therefore, the components of the reaction system were determined to be: pH4.6 disodium hydrogen phosphate-citric acid buffer solution, alizarin red S solution and aluminum ion solution, and the detection wavelength was 490nm.

Embodiment 3

[0037] Embodiment 3: Optimization of reaction system components and conditions

[0038]On the basis of Example 2, the reaction system and reaction conditions were optimized, and different additions of 0.25g / L Alizarin Red S solution (0.8mL, 1.0mL, 1.2mL, 1.5mL, 1.8mL and 2.0mL ), pH4.6 disodium hydrogen phosphate-citric acid buffer (0.1mL, 0.15mL, 0.20mL and 0.25mL,) and 1.0mg / mL aluminum ion standard solution addition (0.1mL, 0.2mL, 0.3mL , 0.4mL, 0.5mL, 0.6mL, 0.7mL, 0.8mL, 0.9mL and 1.0mL) on the sensitivity and accuracy of the detection method.

[0039] see results Figure 3-5 :

[0040] Depend on image 3 It can be seen that at 490nm, under different aluminum concentration gradients (0.2-0.7mL), when the buffer addition amount is 0.15mL, the absorbance value range is relatively wide and the sensitivity is good, so 0.15mL is selected as the addition amount;

[0041] Depend on Figure 4 It can be seen that at 490nm, under different aluminum concentration gradients (0.2...

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Abstract

The invention relates to a method for determination of aluminum ion by alizarin red S complexation spectrophotometry, and the method includes: accurately taking 1.5mL of alizarin red S solutions and 0.15mL of disodium hydrogen phosphate-citric acid buffer solutions with the pH of 4.6, respectively adding 0mL, 0.1mL, 0.2mL, 0.3mL, 0.4mL, 0.5mL, 0.6mL and 0.7mL of aluminum ion standard solutions into each solution, adding deionized water to fix to a constant volume of 5ml, mixing evenly, standing for 10min, determining the light absorption value at 490nm, and drawing an aluminum ion standard curve by using the aluminum ion content as horizontal coordinates and the light absorption value as vertical coordinates. The method for determination has the advantages of simple operation, high sensitivity, accurate test results, and good selectivity, and is in accordance with the test precision.

Description

technical field [0001] The invention belongs to the field of analysis and detection, in particular to a method for determining the content of aluminum ions by alizarin red S complexation spectrophotometry. Background technique [0002] Aluminum salts are widely used in tableware and food additives in the catering industry, water treatment agents in environmental governance, and immune adjuvants in medicine, etc., and have become an indispensable part of daily life. However, once excessive aluminum salt enters the human body through food, medicine, drinking water and other ways, it will show biological toxicity effects. Studies have shown that senile dementia (Alzheimer's disease), Guam Parkinson's dementia syndrome, amyotrophic lateral sclerosis, and dialysis encephalopathy and other neurological disorders, osteomalacia and microcytic anemia, etc. Related to the excessive intake of aluminum salts, the related diseases are called aluminum encephalopathy and aluminum bone dis...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/38
Inventor 王晓力王永刚朱新强王春梅张茜路远汪晓斌杨晓
Owner 甘肃伊牧兰肉类加工有限公司
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