Method for simultaneously measuring trivalent chromium and hexavalent chromium in water samples by aid of low-pressure ion chromatograms and inductively coupled plasma mass spectra in combination manner

A low-pressure ion chromatography and inductive coupling technology, applied in the field of detection and analysis of environmental water bodies, can solve problems such as the need for improvement in analysis sensitivity, inability to be used for direct detection, and human injury, and achieve wide linear range, low detection limit, and improved sensitivity Effect

Inactive Publication Date: 2016-07-27
SICHUAN UNIV
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Problems solved by technology

Trivalent chromium is an essential trace element for the human body. It can participate in the metabolism of carbohydrates and lipids in animals, and has the function of promoting growth and development. However, long-term animal experiments have shown that soluble trivalent chromium can enter the reproductive system through the blood-testis barrier. Has obvious teratogenicity and reproductive toxicity
Hexavalent chromium is extremely toxic and is easily absorbed by the human body through the skin and accumulates in the body. If ingested accidentally, it will cause irreversible damage to the human body
The linear range of the above method is 5-600 μg / L, the detection limit of analyzing Cr(VI) is 0.6 μg / L, and the detection limit of analyzing Cr(Ⅲ) is 0.8 μg / L, so when the chromium content in water is too low When the above method cannot be used to directly detect Cr(Ⅲ) and Cr(VI) in water samples, the analytical sensitivity needs to be improved

Method used

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  • Method for simultaneously measuring trivalent chromium and hexavalent chromium in water samples by aid of low-pressure ion chromatograms and inductively coupled plasma mass spectra in combination manner
  • Method for simultaneously measuring trivalent chromium and hexavalent chromium in water samples by aid of low-pressure ion chromatograms and inductively coupled plasma mass spectra in combination manner
  • Method for simultaneously measuring trivalent chromium and hexavalent chromium in water samples by aid of low-pressure ion chromatograms and inductively coupled plasma mass spectra in combination manner

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Embodiment 1

[0028] In the present embodiment, the standard sample is tested to investigate the precision, linear range and detection limit of the method of the present invention, the steps are as follows:

[0029] 1. Preparation of standard samples

[0030] (1) Preparation of Cr(Ⅲ) standard stock solution: Accurately weigh Cr(NO 3 ) 3 9H 2 O0.7692g is placed in the beaker, after dissolving with deionized water, transfer it to a 100mL volumetric flask, and set the volume to 100mL for subsequent use with deionized water to obtain a Cr(Ⅲ) standard stock of 1000.00mg / L with a Cr(Ⅲ) concentration liquid.

[0031] (2) Cr(Ⅵ) standard stock solution: accurately weigh K 2 Cr2 o 7 Put 0.0270g in a beaker, dissolve it with deionized water, transfer it to a 100mL volumetric flask, and set the volume to 100mL with deionized water for later use, to obtain a Cr(Ⅵ) standard stock solution with a Cr(Ⅵ) concentration of 1000.00 mg / L .

[0032] (3) Use the standard stock solution and deionized water ...

Embodiment 2

[0048] In this embodiment, the analysis and determination of the tannery wastewater sample is carried out to investigate the effect of the method of the present invention on simultaneously determining trivalent chromium and hexavalent chromium in the water sample.

[0049] 1. Sample Preparation

[0050] Three samples of tannery wastewater were collected, respectively numbered as 1# sample, 2# sample and 3# sample. After each sample was collected, it was gravity settled for 1 hour, and the supernatant was taken for direct analysis.

[0051] 2. Preparation of eluent E

[0052] 20gNaNO 3 Put it in a beaker, dissolve it with deionized water, transfer it to a 1000mL volumetric flask, and dilute to 1000mL with deionized water.

[0053] 3. Sample spectrum drawing

[0054] use figure 1 and figure 2 The analyzers designed for the process flow shown were tested, where figure 1 is the sample injection state, figure 2 For analysis state, this analytical instrument comprises low-p...

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Abstract

The invention provides a method for simultaneously measuring trivalent chromium and hexavalent chromium in water samples by the aid of low-pressure ion chromatograms and inductively coupled plasma mass spectra in a combination manner.The method is implemented by the aid of an analytical instrument which comprises a low-pressure pump, a six-way sample injection valve, a sample injection ring, a low-pressure adsorption column, a low-pressure anion separation column and an inductively coupled plasma mass spectrometer.The method includes steps of 1, surveying and mapping base lines; 2, surveying and mapping spectrograms of the trivalent chromium and the hexavalent chromium in the test samples; 3, replacing the test samples by a series of standard samples with trivalent chromium and hexavalent chromium with known concentrations, carrying out operation at the steps 1 and 2 again to obtain spectrograms of the trivalent chromium and the hexavalent chromium in the series of standard samples, and drawing working curves of the trivalent chromium/the hexavalent chromium; 4, substituting peak height values of the spectrograms of the trivalent chromium/the hexavalent chromium in the test samples into regression equations of the working curves, obtained at the step 3, of the trivalent chromium/the hexavalent chromium and computing the concentrations of the trivalent chromium and the hexavalent chromium in the test samples.The concentrations of the trivalent chromium/the hexavalent chromium in the standard samples are used as horizontal coordinates for drawing the working curves of the trivalent chromium/the hexavalent chromium, and peak heights of the spectrograms of the trivalent chromium/the hexavalent chromium in the standard samples are used as vertical coordinates for drawing the working curves of the trivalent chromium/the hexavalent chromium.

Description

technical field [0001] The invention belongs to the field of detection and analysis of environmental water bodies, in particular to a method for simultaneously determining trivalent chromium and hexavalent chromium in water samples by combining low-pressure ion chromatography and inductively coupled plasma mass spectrometry. Background technique [0002] Chromium mainly exists in two valence states of trivalent chromium and hexavalent chromium. Trivalent chromium is an essential trace element for the human body. It can participate in the metabolism of carbohydrates and lipids in animals, and has the function of promoting growth and development. However, long-term animal experiments have shown that soluble trivalent chromium can enter the reproductive system through the blood-testis barrier. Has obvious teratogenicity and reproductive toxicity. Chromium is toxic to microorganisms and plants and is a non-essential element. Excessive trivalent chromium will interfere with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/8868
Inventor 张新申靳皓琛
Owner SICHUAN UNIV
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