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

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...

AI Technical Summary

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.

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