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A kind of detection method of chromium content in organic chromium

A detection method and technology of chromium content, applied in the field of detection of chromium content in organic chromium, achieves the effect of simple operation, good reproducibility and high accuracy

Active Publication Date: 2011-12-14
湖北华扬科技发展有限公司
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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 chromium content in organic chromium aimed at the defects of existing metal chromium determination methods, so as to make up for the deficiencies in the prior art

Method used

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  • A kind of detection method of chromium content in organic chromium
  • A kind of detection method of chromium content in organic chromium
  • A kind of detection method of chromium content in organic chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 Silver nitrate aqueous solution: 10g / L;

[0024] 1.3 Ammonium persulfate;

[0025] 1.4 Diphenylcarbazide acetone solution: 5g / L;

[0026] 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;

[0027] 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.

[0028] 3.1 Weigh 0.4000g of chromium pyridinecarboxylate raw powder (accurate to 0.0001), add it to a 150mL conical flask, add 20mL of sulfuric acid (1+1), boil on an electric stove for 2-3min, transfer to a 500mL volumetric flask after cooli...

Embodiment 2

[0037] Example 2 Determination of 9.9% chromium picolinate and 10% chromium nicotinate

[0038] 4.1 Weigh 0.4000g of the sample (accurate to 0.0001), add it to 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 500mL volumetric flask, and constant volume, Shake well and filter. Draw 2 mL of the filtrate and add it to a 50 mL beaker. Another 50mL empty beaker was used as a blank.

[0039] 4.2 Add 2mL of sulfuric acid (1+1) to the two beakers, put it on the electric stove and cook on low heat until the sulfuric acid refluxes to 2 / 3 of the cup wall, take it off and cool, add 0.5mL of silver nitrate solution, 0.5g of ammonium persulfate, Dilute to 20mL with water, heat on a small electric stove until small bubbles emerge, then boil on high heat for 2min-3min (add water during boiling to keep the solution at 20mL), remove and cool, transfer to a 50mL volumetric flask, add 2mL Diphenylcarbazide ...

Embodiment 3

[0047] Example 3 0.1% Chromium

[0048] 5.1 Weigh 1.0000g of the sample (accurate to 0.0001), add it to a 150mL conical flask, add 40mL of water and 20mL of sulfuric acid (1+1), boil it on an electric stove for 5min, cool it down naturally, transfer it to a 100mL volumetric flask, and constant volume, Shake well and filter. Draw 2 mL of the filtrate and add it to a 50 mL beaker. Another 50mL empty beaker was used as a blank.

[0049]5.2 Add 2mL of sulfuric acid (1+1) to the two beakers, put it on the electric furnace and cook on low heat until the sulfuric acid refluxes to 2 / 3 of the cup wall, take it off and cool, add 0.5mL of silver nitrate solution, 0.5g of ammonium persulfate, Dilute to 20mL with water, heat on a small electric stove until small bubbles emerge, then boil on high heat for 2min-3min (add water during boiling to keep the solution at 20mL), remove and cool, transfer to a 50mL volumetric flask, add 2mL Diphenylcarbazide acetone solution, dilute to the scale ...

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Abstract

The invention relates to a method for testing metal chromium, in particular to a method for detecting the chromium content of organic chromium. The method comprises the following steps of: decomposing a test sample by using acid, oxidizing all Cr3<+> of the sample into Cr6<+> by using ammonium persulfate under a silver nitrate water catalytic condition, and reacting the Cr6<+> with diphenylcar bazide to generate an amaranthine complex compound under an acidic condition; and performing colorimetric estimation to obtain the chromium content. The method is simple in operation, high in reproducibility and high in accuracy.

Description

technical field [0001] The invention relates to a method for measuring metallic chromium, in particular to a method for detecting chromium content in organic 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 ...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
Inventor 黄剑雄闵江华
Owner 湖北华扬科技发展有限公司
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