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Autoanalysis method of iron content in water sample

An automatic analysis and iron content technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve problems such as slow analysis speed, poor precision, and weak oxidation , to achieve rapid detection, easy on-line monitoring, and high precision

Inactive Publication Date: 2013-07-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is still a manual analysis and detection method, which is not only cumbersome to operate, slow in analysis speed, but also has poor precision (RSD is 3.8% to 6.2%), and is not suitable for on-site on-line monitoring. In addition, potassium bromate is used as the oxidant. Weak oxidation, not conducive to shortening the analysis time

Method used

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  • Autoanalysis method of iron content in water sample
  • Autoanalysis method of iron content in water sample
  • Autoanalysis method of iron content in water sample

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the standard sample is tested, and the precision of the method of the present invention is investigated by using a standard sample with a known ferrous ion concentration. The steps are as follows:

[0030] 1. Preparation of standard samples

[0031] (1) Prepare a standard stock solution of ferrous ion Fe(II) with a concentration of 1000 mg / L: weigh 0.4975 g FeSO 4 ·7H 2 O in a beaker, add 0.5mL of concentrated sulfuric acid, then add distilled water to dissolve, transfer all to a 100mL volumetric flask with distilled water to make up the volume, the concentration of ferrous ion Fe(II) is 1.0 g / L.

[0032] (2) Prepare 40 μg / L ferrous ion Fe(II) ion standard sample: pipette 10 μL of 1.0 g / L ferrous ion Fe(II) standard stock solution into a 250 mL volumetric flask, and use a deionized Dilute to the mark with water.

[0033] 2. Preparation of chromogenic solution R

[0034] (1) Add 0.1 g of neutral red into a 100 mL volumetric flask, and prepare a n...

Embodiment 2

[0046] In this embodiment, there are three kinds of samples to be tested, wherein, 1# sample is Funan River water in Chengdu City, Sichuan Province, China, 2# sample is A1 pond water in Chengdu City, Sichuan Province, China, and 3# sample is Chengdu City, Sichuan Province, China City B1 pond water. The sample to be tested was diluted 5 times and then injected for analysis.

[0047] The analysis steps are as follows:

[0048] 1. Preparation of standard samples

[0049] (1) Prepare a standard stock solution of ferrous ion Fe(II) with a concentration of 1000 mg / L: weigh 0.4975 g FeSO 4 ·7H 2 O in a beaker, add 0.5mL of concentrated sulfuric acid, then add distilled water to dissolve, transfer all to a 100mL volumetric flask with distilled water to make up the volume, the concentration of ferrous ion Fe(II) is 1.0 g / L.

[0050] (2) Dilute the standard stock solution prepared in step (1) with deionized water to prepare a series of standard samples. The concentrations of ferrous...

Embodiment 3

[0070] In the present embodiment, there are three kinds of tested samples, wherein, 1# sample is Funan River water in Chengdu, Sichuan Province, China, 2# sample is A2 pond water in Chengdu, Sichuan Province, China, and 3# sample is Chengdu, Sichuan Province, China City B2 pond water. The sample to be tested was diluted 5 times and then injected for analysis.

[0071] 1. Preparation of standard samples

[0072] The preparation of the standard sample is the same as in Example 2, and the concentrations of ferrous ion Fe(II) in each standard sample are: 5 μg / L, 10 μg / L, 20 μg / L, 40 μg / L, 60 μg / L , 70 μg / L.

[0073] 2. Preparation of chromogenic solution R

[0074] (1) Add 0.1 g of neutral red into a 100 mL volumetric flask, and prepare a neutral red aqueous solution with a concentration of 1.0 g / L with deionized water;

[0075] (2) Take 0.3 mL of neutral red (NR) solution with a concentration of 1.0 g / L, 5 mL of H with a concentration of 0.01 mol / L 2 S0 4 In a 100 mL volume...

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Abstract

The invention relates to an autoanalysis method of iron content in water samples. In the method, operated at low pressure, an analytical instrument including a sample flow path, a coloration liquid flow path, an oxidation liquid flow path, a promotion liquid flow path, a low pressure pump, an injection valve, an injection loop, an analysis flow path, an optical flow cell, an optical detector and a computer processing system is used. The method includes the steps of: starting the analytical instrument, mapping a sample spectrum, replacing samples S1 by a series of samples S2 with known concentrations of ferrous ions or ferric ions, repeating the mapping step of the sample spectrum to obtain a series of standard spectra, drawing a working curve by taking the concentrations of standard samples as an abscissa and taking peak heights of the standard sample spectra as a vertical coordinate, comparing the drawn test sample spectra with the standard sample spectra, and calculating the iron content of the sample by a regression equation of the working curve. A coloration liquid R is a neutral red-sulfuric acid aqueous solution, an oxidation liquid O is a potassium periodate aqueous solution, and a promotion liquid C is deionized water.

Description

technical field [0001] The invention belongs to a detection and analysis method for iron content in water samples, in particular to an automatic analysis method for iron content in river water. Background technique [0002] Iron is one of the essential nutrients for the human body and an indispensable trace element in human metabolism. Iron is a constituent of hemoglobin, myoglobin and many enzymes, and has a wide range of functions with biological gene expression, information conduction, electron transfer and immunity. However, excessive iron can lead to its potentially harmful effects in the body, causing disorders in the body's metabolic processes, and may even lead to many diseases such as heart and liver diseases, diabetes, tumors, etc. Moreover, iron and its compounds are of low toxicity and slight toxicity, and the water with high iron content is yellowish and has an iron smell, which affects the color and taste of the water. Therefore, the quantitative determination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 张新申蒋和梅
Owner SICHUAN UNIV
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