Detection method of hexavalent chromium content

A detection method and technology of chromium content, applied in the preparation of test samples, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc., to achieve high accuracy, easy operation, heavy weight, etc. good effect

Inactive Publication Date: 2011-11-23
HUBEI SHENZHOU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a detection method for the content of hexavalent chromium aimed at the defects of the existing metal chromium determination method, so as to make up for the deficiencies in the prior art

Method used

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  • Detection method of hexavalent chromium content
  • Detection method of hexavalent chromium content
  • Detection method of hexavalent chromium content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Cr in embodiment 1 chromium pyridinecarboxylate raw powder 6+ Determination of

[0021] 1 Reagents and solutions

[0022] 1.1 Sulfuric acid (1+1); 98% concentrated sulfuric acid and water are prepared according to the volume ratio of 1:1

[0023] 1.2 Diphenylcarbazide acetone solution: 5g / L;

[0024] 2.1 Chromium standard stock solution: Weigh 0.1415g of potassium dichromate baked at 105°C to constant weight, dissolve in water, transfer to a 500mL volumetric flask, and dilute to the mark. This solution contains 0.10mg of chromium per ml;

[0025] 2.2 Chromium standard solution: pipette 10ml of chromium stock solution into a 100mL volumetric flask and dilute to the mark with water. This solution contains 10μg of chromium per ml.

[0026] 3. Determination of hexavalent chromium

[0027] 3.1 Weigh 2.0000g (accurate to 0.0001) of the original chromium pyridinecarboxylate powder sample, add it to a 150mL conical flask, add 40mL of water, 20mL of sulfuric acid (1+1), boil...

Embodiment 2

[0037] Cr in embodiment 2 9.9% (chromium content) chromium picolinate and 10% chromium nicotinate 6+ determination

[0038] 1 Weigh 2.000--4.0000g of the sample (accurate to 0.0001), add it to a 150mL Erlenmeyer flask, add 40mL of water, 20mL of sulfuric acid (1+1), boil on an electric stove for 5min, cool naturally, transfer to a 100mL volumetric flask, Make up to volume, shake well and filter.

[0039] Draw 10mL of filtrate, add it to a 50mL volumetric flask, add 0.5mL sulfuric acid (1+1), 2mL diphenylcarbazide acetone solution, and dilute to the mark with water. Take another 50mL volumetric flask, add 0.5mL sulfuric acid (1+1), 2mL diphenylcarbazide acetone solution, and dilute to the mark with water. as blank. Use a blank as a comparison, and immediately measure its absorbance A at a wavelength of 540nm.

[0040] Take 2mL of chromium standard solution (10μg / mL) and put it into a 50mL volumetric flask, add 0.5mL of sulfuric acid (1+1), 2mL of diphenylcarbazide acetone s...

Embodiment 3

[0048] Example 3 Cr in 0.1% (chromium content) chromium picolinate and chromium nicotinate 6+ determination

[0049] 1 Sample 2.000--5.0000g (accurate to 0.0001), put it into a 150mL conical flask, add 40mL of water, 20mL of sulfuric acid (1+1), boil on an electric stove for 5min, cool naturally, transfer to a 100mL volumetric flask, and constant volume , shake well and filter.

[0050] Draw 10mL of filtrate, add it to a 50mL volumetric flask, add 0.5mL sulfuric acid (1+1), 2mL diphenylcarbazide acetone solution, and dilute to the mark with water. Take another 50mL volumetric flask, add 0.5mL sulfuric acid (1+1), 2mL diphenylcarbazide acetone solution, and dilute to the mark with water. as blank. Use a blank as a comparison, and immediately measure its absorbance A at a wavelength of 540nm.

[0051] Take 2mL of chromium standard solution (10μg / mL) and put it into a 50mL volumetric flask, add 0.5mL of sulfuric acid (1+1), 2mL of diphenylcarbazide acetone solution, dilute to...

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Abstract

The invention relates to a determination method of metal chromium, and particularly a detection method of hexavalent chromium content. According to the method, a sample is decomposed by an acid, and a mauve complex is generated by allowing hexavalent chromium Cr6+ to react with diphenylcarbazide under an acidic condition; colorimetric determination is performed to obtain the chromium content. The method of the invention has simple operation, good reproducibility, and high accuracy.

Description

technical field [0001] The invention relates to a method for measuring metallic chromium, in particular to a method for detecting the content of hexavalent chromium. Background technique [0002] Chromium is one of the essential trace elements for human body and animals, which can affect the absorption and metabolism of carbohydrates, lipids and proteins. The effects of adding chromium in animal feed are mainly anti-stress, regulating immunity, improving lean meat rate and calving performance. However, chromium is also a heavy metal element that is highly toxic to humans and livestock. If excessive chromium is added in the production of feed industry, the excess chromium will be ingested and absorbed by humans or animals through the enrichment of the food chain. Long-term drinking or eating of groundwater, plants, and food with high chromium content will cause diseases such as intestinal tract, anemia, and even cancer. Livestock eating feed containing too much chromium wi...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28
Inventor 黄剑雄闵江华
Owner HUBEI SHENZHOU CHEM
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