Automatic Analysis Method of Trace Trivalent Chromium in Water Samples

An automatic analysis and trivalent chromium 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. Problems, achieve the effect of overcoming cumbersome and complicated operation, speeding up the fading speed and simple operation

Inactive Publication Date: 2017-11-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 Analysis Method of Trace Trivalent Chromium in Water Samples
  • Automatic Analysis Method of Trace Trivalent Chromium in Water Samples
  • Automatic Analysis Method of Trace Trivalent Chromium in Water Samples

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: 0.769g Cr(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) 0.769g Cr(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 vo...

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) 0.769g Cr(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 v...

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Abstract

The invention provides an automatic analysis method for trace trivalent chromium in water samples, which comprises a low-pressure pump, a sampling valve, a mixer, a reactor, an optical flow cell, an optical detector, a computer processing system, a sample flow path, The analytical instruments for the flow path of the pushing liquid, the masking agent, the oxidizing liquid, and the chromogenic liquid flow are as follows: ① measure the baseline; ② measure the spectrum of trivalent chromium in the sample; ③ draw the working curve; The peak height value of the trivalent chromium spectrogram in the sample is brought into the regression equation of the working curve to calculate the concentration of the trivalent chromium to be measured in the sample. The driving solution is HNO3 aqueous solution, the masking agent is a mixed aqueous solution of ethylenediaminetetraacetic acid and Tween-20, and the oxidizing solution is a mixed solution prepared by potassium periodate, sodium tripolyphosphate, water and phosphate buffer , the chromogenic solution is an aqueous solution of indigo carmine. The method of the invention realizes the direct determination of the trace amount of trivalent chromium in the water sample, simplifies the analysis operation and improves the analysis sensitivity.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79
Inventor 张新申赵正喜莫珊高跃昕
Owner SICHUAN UNIV
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