Method for analyzing copper in copper-containing ferric trichloride with low electronic grade

A copper ferric chloride and analysis method technology, applied in the field of chemical analysis, can solve the problems of interference measurement, high minimum copper concentration, color affecting colorimetry, etc., to achieve the effect of eliminating interference

Inactive Publication Date: 2012-10-17
昆山市千灯三废净化有限公司
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Problems solved by technology

But no matter which kind of titration method can only accurately titrate high-content copper; and when the atomic absorption method measures copper, due to the limitation of the standard curve, the measurement range is narrow (0.2-5mg / L), and the minimum copper concentration that can be accurately measured is relatively low. High (0.2mg / L), cannot be accurately determined for trace copper
In addition, when measuring copper in copper-containing ferric chloride by spectrophotometry, due to the high concentration of iron, the color of ferric chloride will affect the colorimetry and may even interfere with the measurement.

Method used

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  • Method for analyzing copper in copper-containing ferric trichloride with low electronic grade
  • Method for analyzing copper in copper-containing ferric trichloride with low electronic grade
  • Method for analyzing copper in copper-containing ferric trichloride with low electronic grade

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example 1

[0016] The method for analyzing copper in low electronic grade copper-containing ferric chloride comprises the steps:

[0017] one. instrument

[0018] UV-756CM spectrophotometer, 10ml cuvette, 50ml colorimetric tube, PH meter or precision PH test paper, 100ml volumetric flask, filter paper, funnel, rubber ball, 25ml pot-bellied straw

[0019] two. Reagent

[0020] Copper standard stock solution: Weigh 1.0000g of spectrally pure metal copper, dissolve it in 20ml of 1:1 nitric acid, after cooling, dilute it in a 1000ml volumetric flask with pure water, shake well, 1.00ml of this solution contains 1.00mg of Cu. Take the copper standard stock solution and dilute it into the required standard solution, such as 10.0 μg Cu in 1.00 ml or 50.0 μg Cu in 1.00 ml.

[0021] Saturated sodium fluoride solution: Weigh 4.06g of sodium fluoride, dissolve it in a 100ml volumetric flask.

[0022] 40% triammonium citrate solution: weigh 40g of triammonium citrate, dissolve in pure water, and...

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Abstract

The invention discloses a method for analyzing copper in copper-containing ferric trichloride with low electronic grade, comprising the following specific steps: (1) pre-treating a sample: adding hydrochloric acid and hydrogen peroxide in a copper-containing ferric trichloride sample, boiling for a certain time, adding saturated sodium fluoride solution, and filtering into a volumetric flask by metering volume; and (2) measuring the content of copper by using the modified bis-(cyclohexanone)oxalyl dihydrazone spectrophotometry. According to the method, the content of copper in the copper-containing ferric trichloride with low electronic grade is measured by adopting the bis-(cyclohexanone)oxalyl dihydrazone spectrophotometry, because the concentration of ferrum in the sample is high, the final color comparison is affected. According to the invention, the sodium fluoride is added into the to-be-measured solution for removing ferrum, so that the interference of the high-concentration ferrum can be eliminated, and the trace of the copper in the copper-containing ferric trichloride can be measured accurately.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a method for analyzing copper in low-electronic grade copper-containing ferric chloride. Background technique [0002] The analysis methods of copper content include titration, atomic absorption and spectrophotometry. But no matter which kind of titration method can only accurately titrate high-content copper; and when the atomic absorption method measures copper, due to the limitation of the standard curve, the measurement range is narrow (0.2-5mg / L), and the minimum copper concentration that can be accurately measured is relatively low. High (0.2mg / L), cannot be accurately determined for trace copper. In addition, when spectrophotometry is used to determine copper in copper-containing ferric chloride, due to the high concentration of iron, the color of ferric chloride will affect the colorimetry, and may even interfere with the measurement. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/34
Inventor 姚明辉庄永金梁云朱鸽
Owner 昆山市千灯三废净化有限公司
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