Automatic analysis method of formaldehyde in water sample

An automatic analysis and formaldehyde technology, applied in the direction of analysis materials, instruments, etc., can solve the problems of poor anti-interference ability, slow analysis speed, and complicated operation, and achieve the effects of high precision, reduced analysis cost, and improved analysis speed.

Inactive Publication Date: 2013-09-18
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

The acetylacetone colorimetric method (HJ601-2011) can be used for the determination of formaldehyde in water samples, but heating is required during the analysis; the phenol reagent colorimetric method (GB / T18204.26-2000) is used for the determination of formaldehyde in the air, because Compared with air, the types and contents of interfering substances in water samples are much more. When the phenol reagent colorimetric method is directly used for the determination of formaldehyde in water samples, it is very difficult; in addition, each step of the two methods of determination All are manually operated, which is not only cumbersome to operate, but the analysis speed is slow, and the anti-interference ability in the measurement process is poor

Method used

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  • Automatic analysis method of formaldehyde in water sample
  • Automatic analysis method of formaldehyde in water sample
  • Automatic analysis method of formaldehyde in water sample

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Experimental program
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Effect test

Embodiment 1

[0037] This embodiment prepares the Cl containing quaternary amine group - Type exchange resin, the preparation method is as follows:

[0038] 1. Take styrene and divinylbenzene as raw materials, take benzoyl peroxide as catalyst, the quality of styrene: the quality of divinylbenzene: the quality of benzoyl peroxide=600:60:1; Put vinylbenzene and benzoyl peroxide into the reaction container, carry out polymerization reaction at normal pressure and 90°C to generate styrene-divinylbenzene spherical copolymer beads, and the reaction time is 15h;

[0039] ② Sorting the styrene-divinylbenzene spherical copolymer beads prepared in step ① with a standard sieve to obtain styrene-divinylbenzene spherical copolymer beads with a particle size of 30 μm to 50 μm;

[0040] ③Put styrene-divinylbenzene spherical copolymer beads with a particle size of 30 μm to 50 μm in a reaction vessel, add chloromethyl ether, dichloromethane and nitromethane and stir evenly, then at room temperature and no...

Embodiment 2

[0043] In this embodiment, the standard sample is tested to investigate the precision of the method of the present invention. The steps are as follows:

[0044] 1. Preparation of standard samples

[0045] (1) Prepare a standard stock solution of formaldehyde with a concentration of 1000 mg / L: Take 2.8 mL of formaldehyde solution with a content of 36% to 38%, put it into a 1L volumetric flask, add deionized water to dilute to the mark, and shake well. Calibrated by iodometric method. The prepared formaldehyde standard stock solution can be stored at 4°C for half a year.

[0046] (2) Prepare 0.200 mg / L formaldehyde standard sample: pipette 0.02 mL of the formaldehyde standard stock solution prepared in step (1) into a 100 mL volumetric flask, and dilute to the mark line with deionized water.

[0047] 2. Chromogenic solution R 1 preparation

[0048] Weigh 0.3 g ferric ammonium sulfate (NH 4 Fe(SO 4 ) 2 12H 2 O), dissolved in hydrochloric acid with a concentration of 0.03...

Embodiment 3

[0059] In the present embodiment, the tested samples are three kinds of tanning wastewater, which are respectively 1# sample, 2# sample and 3# sample, and its analysis steps are as follows:

[0060] 1. Preparation of standard samples

[0061] ① Prepare a standard stock solution of formaldehyde with a concentration of 1000 mg / L

[0062] The method of preparing formaldehyde standard stock solution is identical with embodiment 2.

[0063] ② Prepare a series of standard samples

[0064] Dilute the formaldehyde standard stock solution prepared in step ① with deionized water to prepare a series of standard samples. The concentrations of formaldehyde in each standard sample are: 0, 0.005 mg / L, 0.010 mg / L, 0.050 mg / L, 0.100 mg / L, 0.300 mg / L, 0.500 mg / L, 0.700 mg / L, 0.900 mg / L and 1.00 mg / L.

[0065] 2. Chromogenic solution R 1 , reference solution R 0 and reaction solution R 2 Same as Example 2, and the preparation method is the same as Example 2.

[0066] The chemical reagent...

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Abstract

The invention discloses an automatic analysis method of formaldehyde in a water sample. The automatic analysis method comprises the following steps of: enabling a mixed solution of a test sample S1, reaction liquid R2 and a reference solution R0 to enter an optical flow cell by adopting a negative-phase reference flow injection method; transmitting a signal to a computer processing system for processing by an optical detector to obtain a base line, a standard sample or a test sample which is mixed with the reaction liquid R2 and a chromogenic solution R1 to generate chromogenic reaction; and enabling the formed chromogenic mixed solution to enter the optical flow cell, and transmitting the signal to the computer processing system for processing by the optical detector to obtain a standard sample spectrogram or a test sample spectrogram; and calculating the content of formaldehyde in the test sample by a regression equation of a standard sample working curve according to the peak height of the test sample spectrogram, wherein the chromogenic solution R1 is an ammonium ferric sulfate-hydrochloric acid aqueous solution; the reference solution R0 is hydrochloric acid aqueous solution; the reaction liquid R2 is a phenol reagent aqueous solution. The analysis apparatus comprises a sample flow path with a cation exchange column, a reference solution flow path, a chromogenic solution flow path, a reaction liquid flow path, an analysis flow path and the computer processing system.

Description

technical field [0001] The invention belongs to the field of detection and analysis of formaldehyde in water samples, in particular to an analysis method for automatic detection and analysis of formaldehyde in waste water. Background technique [0002] Formaldehyde is an irritating and suffocating colorless gas at room temperature. It is a protoplasmic poison and can bind to proteins. Inhalation of high concentrations of formaldehyde can cause severe irritation of the respiratory tract, edema, eye irritation, headache, and bronchial asthma; direct contact of formaldehyde with the skin can cause dermatitis and stains; regular inhalation of a small amount of formaldehyde can cause chronic poisoning and systemic symptoms There are headaches, fatigue, palpitations, insomnia, weight loss, and autonomic disorders. Formaldehyde has been identified as carcinogenic and teratogenic substances by the World Health Organization in 2004. [0003] Formaldehyde is widely used as an import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/00G01N35/08
Inventor 张新申李楠蒋小萍
Owner SICHUAN UNIV
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