Automatic analyzing method for trace trivalent chromium in water sample

An automatic analysis, trivalent chromium technology, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc. problem, to achieve the effect of simple operation, speeding up the fading speed, and overcoming the cumbersome and complicated operation

Inactive Publication Date: 2015-12-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Chromium is widely used in metallurgy, electroplating, tanning, wood preservation, pigments, and pulp production. Due to the unreasonable disposal and discharge of chromium-containing wastewater and waste residues, chromium has caused serious pollution to the environment.
Trivalent chromium has biological activity, can participate in the carbohydrate and lipid metabolism in animals, and has the function of promoting growth and development (J.B.Vincent, 2000). However, long-term animal experiments have shown that soluble trivalent chromium can enter the reproductive system through the blood-testis barrier , with obvious teratogenicity and reproductive toxicity (A.Levina, 2008)
None of the above methods can directly determine the concentration of trivalent chromium in water samples, the operation is cumbersome and complicated, and the sensitivity of the analysis needs to be improved

Method used

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  • Automatic analyzing method for trace trivalent chromium in water sample
  • Automatic analyzing method for trace trivalent chromium in water sample
  • Automatic analyzing method for trace trivalent chromium in water sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this implementation, investigate the situation that trivalent chromium catalyzes potassium periodate oxidation indigo carmine to fade, and the steps are as follows:

[0032] 1. Specimen Preparation

[0033] Preparation of trivalent chromium solution: 0.769gCr(NO 3 ) 3 9H 2 O was dissolved in deionized water, then sulfuric acid was added to H 2 SO 4 The concentration is 0.05mol / L, and the mother liquor is obtained by distilling the volume to a 100mL volumetric flask with deionized water, and stored in a refrigerator for later use; the mother liquor is diluted with deionized water, and nitric acid is added until the final concentration of nitric acid is 10mmol / L, and the The concentration of trivalent chromium is 100mg / L, HNO 3 Trivalent chromium solution with a concentration of 10mmol / L.

[0034] 2. Full wavelength scanning

[0035](1) Take four 10mL stoppered test tubes and record them as 1#~4# test tubes respectively. Add 0.5mL of ethylenediaminetetraacetic ...

Embodiment 2

[0040] The present embodiment tests the standard sample, to investigate the precision of the method of the present invention, the steps are as follows:

[0041] 1. Preparation of standard samples

[0042] (1) 0.769gCr(NO 3 ) 3 9H 2 O was dissolved in deionized water, then sulfuric acid was added to H 2 SO 4 The concentration is 0.05mol / L, and the mother liquor is obtained by distilling the volume into a 100mL volumetric flask with deionized water, and storing it in a refrigerator for later use;

[0043] (2) Dilute the mother liquor with deionized water, add nitric acid until the final concentration of nitric acid is 10mmol / L, and prepare trivalent chromium concentration of 5 μg / L, HNO 3 A standard sample with a concentration of 10mmol / L.

[0044] 2. Preparation of masking agent M

[0045] Take 20mL of EDTA aqueous solution with a concentration of 50g / L, add 1.5mL of Tween-20 aqueous solution with a volume percentage of 10% into a 1000mL volumetric flask, and set the vol...

Embodiment 3

[0057] The present embodiment tests the standard sample, to investigate the precision of the method of the present invention, the steps are as follows:

[0058] 1. Preparation of standard samples

[0059] (1) 0.769gCr(NO 3 ) 3 9H 2 O was dissolved in deionized water, then sulfuric acid was added to H 2 SO 4 The concentration is 0.05mol / L, and the mother liquor is obtained by distilling the volume into a 100mL volumetric flask with deionized water, and storing it in a refrigerator for later use;

[0060] (2) Dilute the mother liquor with deionized water, add nitric acid until the final concentration of nitric acid is 10mmol / L, and prepare trivalent chromium concentration of 200μg / L, HNO 3 A standard sample with a concentration of 10mmol / L.

[0061] 2. Preparation of masking agent M

[0062] Take 20mL of EDTA aqueous solution with a concentration of 50g / L, add 1.5mL of Tween-20 aqueous solution with a volume percentage of 10% into a 1000mL volumetric flask, and set the vo...

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Abstract

The invention provides an automatic analyzing method for trace trivalent chromium in a water sample. An analyzing instrument comprising a low-pressure pump, a sample inlet valve, a mixer, a reactor, an optical circulating tank, an optical detector, a computer processing system, a sample flow passage, a pushing liquid flow passage, a masking agent flow passage, an oxidation liquid flow passage and a developing liquid flow passage is used. The automatic analyzing method includes the following steps that firstly, a base line is measured; secondly, a spectrogram of the trivalent chromium in the sample is measured; thirdly, a working curve is drawn; fourthly, the peak height value of the spectrogram of the trivalent chromium in the sample is brought into a regression equation of the working curve, and the concentration of the trivalent chromium, to be measured, in the sample is calculated. Pushing liquid is an HNO3 water solution, a masking agent is a mixed water solution of ethylenediaminetetraacetic acid and tween-20, oxidation liquid is mixed liquid of periodate potassium, sodium tripolyphosphate, water and a phosphate buffer, and developing liquid is an indigo carmine water solution. By means of the automatic analyzing method, the trace trivalent chromium in a water sample is directly measured, the analyzing operation is simplified, and the analyzing sensitivity is improved.

Description

technical field [0001] The invention belongs to the field of detection and analysis of trivalent chromium, in particular to an automatic analysis method for trace trivalent chromium in water. Background technique [0002] Chromium is widely used in metallurgy, electroplating, tanning, wood preservation, pigments, and pulp production. Due to the unreasonable disposal and discharge of chromium-containing wastewater and waste residues, chromium has caused serious pollution to the environment. Trivalent chromium has biological activity, can participate in the metabolism of carbohydrates and lipids in animals, and has the function of promoting growth and development (J.B.Vincent, 2000). 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 (A. Levina, 2008). Chromium is toxic to microorganisms and plants and is a non-essential eleme...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 张新申赵正喜莫珊高跃昕
Owner SICHUAN UNIV
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