Method for testing content of copper element

A technology for element content and testing methods, which is applied in measurement devices, color/spectral property measurement, material analysis by optical means, etc. Simple, high-accuracy results

Pending Publication Date: 2021-12-03
广东有机宝生物科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the above method to measure copper content requires more reagents, and requires high proficiency in operation, whic...

Method used

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  • Method for testing content of copper element
  • Method for testing content of copper element
  • Method for testing content of copper element

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] A kind of embodiment of the test method of copper element content of the present invention, the test method of copper element content described in the present embodiment comprises the steps:

[0024] (1) Take copper lysine and dissolve it in water and make it up to 100mL. The copper concentration is 10mg / mL. Draw 3mL, 4mL, 5mL, 6mL, 7mL, 8mL in turn, place them in 100mL volumetric flasks and make up to volume with water to get Standard solution; adjust the pH of the solution to within the range of 5-10, then measure the corresponding UV-visible absorption spectra of different concentrations of standard solutions with a UV-visible spectrophotometer, measure the absorbance at 618nm, and draw a standard curve; the measurement results are shown in Table 1 Shown:

[0025] Table 1

[0026]

[0027] (2) Take 0.2925g of basic copper chloride, put it in a 100mL volumetric flask, dissolve it with 50mg / mL L-lysine hydrochloride aqueous solution, make it to volume, shake we...

Embodiment 2

[0031] A kind of embodiment of the test method of copper element content of the present invention, the first step of the test method of copper element content described in the present embodiment is identical with embodiment 1, and step two is as follows:

[0032] Take 0.6810g of copper sulfate, put it in a 100mL volumetric flask, dissolve it with 50mg / mL L-lysine hydrochloride aqueous solution, make it to volume, shake well, draw 15mL of 50mg / mL L-lysine hydrochloride aqueous solution Set the volume to 50mL, adjust the pH to the range of 5-10, measure the absorbance at 618nm with a UV-visible spectrophotometer, and it is 0.45755. According to the formula in Table 1, the copper concentration is calculated to be 0.5175mg / mL, and the copper element content in the sample is =0.5175×(50÷15)×100÷681)×100%=25.33%, the titration result is 25.27% (titrated with reference to the method described in GB / T 34459-2017). The above results show that the content accuracy of copper elem...

Embodiment 3

[0034] A kind of embodiment of the test method of copper element content of the present invention, the first step of the test method of copper element content described in the present embodiment is identical with embodiment 1, and step two is as follows:

[0035] Take 0.7312g of copper glycinate, put it in a 100mL volumetric flask, dissolve it with 50mg / mL L-lysine hydrochloride aqueous solution, make it to volume, shake well, draw 15mL of 50mg / mL L-lysine hydrochloride aqueous solution Set the volume to 50mL, adjust the pH to the range of 5-10, measure the absorbance at 618nm with a UV-visible spectrophotometer, and it is 0.45080. According to the formula in Table 1, the copper concentration is calculated to be 0.510mg / mL, and the copper element content in the sample is =0.510×(50÷15)×100÷731.2)×100%=23.25%, the titration result is 23.32% (titration method: take about 0.8g sample (accurate to 0.0002g) and place it in a 250mL iodine bottle , add 50mL of water to dissolve...

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Abstract

The invention discloses a method for testing the content of a copper element, and relates to the technical field of copper content determination. The method for testing the content of the copper element comprises the following steps: (1) preparing lysine copper aqueous solutions with different concentrations as standard solutions, then measuring absorbance at a characteristic peak by using an ultraviolet and visible spectrophotometer, and drawing a standard curve; and (2) weighing a sample, dissolving the sample with an L-lysine hydrochloride aqueous solution, then diluting until the copper concentration is within the range of the standard curve, measuring absorbance at a characteristic peak, obtaining the copper content in the solution according to the standard curve, and finally calculating the copper element content in the sample.

Description

technical field [0001] The invention relates to the technical field of measuring copper content, in particular to a method for testing copper content. Background technique [0002] At present, the test methods of copper element content are roughly divided into two categories. The test method of copper content that does not contain copper-containing substances that react with iodine is: under weak acid conditions, potassium iodide reacts with copper ions to generate iodine, and titrate with sodium thiosulfate , to obtain the content of copper ions; the detection method of the copper content of the copper-containing substances that react with iodine is: after the sample is digested with nitric acid and hydrochloric acid, under the condition of pH 5, use ethylenediaminetetraacetic acid to complex with copper ions Together, use 1-(2-pyridylazo)-2-naphthol indicator to indicate the titration end point, and calculate the copper content from the volume of consumed disodium edetate ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/3151G01N2021/3155
Inventor 赵林段静娜陈小明
Owner 广东有机宝生物科技股份有限公司
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