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Method for detecting trace iron in copper sulfate

A detection method, copper sulfate technology, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve problems such as operational errors, time-consuming, and complicated operations, and reduce The effect of eliminating errors, eliminating errors, and accurate measurement results

Inactive Publication Date: 2012-01-18
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

The operation of this method is complex, time-consuming, and prone to operational errors

Method used

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  • Method for detecting trace iron in copper sulfate
  • Method for detecting trace iron in copper sulfate
  • Method for detecting trace iron in copper sulfate

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Embodiment 1

[0017] (1) Experimental instruments and reagents

[0018] 7230 visible spectrophotometer (Shanghai Analytical Instrument Factory), ammonium thiocyanate, ammonium persulfate, concentrated hydrochloric acid, iron standard solution. All reagents were of analytical grade.

[0019] Preparation of ammonium thiocyanate developer: Weigh 2g of ammonium thiocyanate, put it in a 100ml brown volumetric flask, dissolve it in water and dilute to the mark.

[0020] 1+1 hydrochloric acid preparation: take 250ml of analytical reagent hydrochloric acid, dilute to 500ml with distilled water, and shake well.

[0021] Iron standard solution (2.5mg / L): Take 2.5ml of 1000mg / L iron standard solution provided by the National Center for Standardization and add 2ml of 1+1 hydrochloric acid to dilute to 1000ml (prepared before use).

[0022] (2) Standard curve drawing

[0023] Accurately weigh 25.0g of high-grade pure copper sulfate, dissolve it in water, transfer it to a 500ml volumetric flask and di...

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Abstract

The invention discloses a method for detecting trace iron in copper sulfate. In the method, an ammonium thiocyanate spectrophotometry is adopted; a background is removed by guarantee reagent copper sulfate which does not contain iron; and the iron content is measured by using ammonium thiocyanate as a color development reagent. In the detection method, iron ions in copper sulfate are oxidized into ferric iron and when solution is regulated into acidity, ammonium thiocyanate is used as a color development reagent, so that Fe3+ can be completely complexed with ammonium thiocyanate and a measurement result is more accurate; and the color of copper ions of the background is removed to carry out measurement by using the same amount of guarantee reagent copper sulfate as a sample, so that an error which is caused by the blue color of copper sulfate and influences light absorption of the sample solution is eliminated and the detection accuracy is improved. Moreover, in the detection method, steps of sedimentation, filtering separation, dissolution measurement and the like do not need to be carried out, so that errors caused by fussy steps are greatly reduced and the measurement result is more reliable.

Description

technical field [0001] The invention relates to a method for detecting trace amounts of iron in copper sulfate. Background technique [0002] The content of iron ions in electroplating grade copper sulfate is an important indicator related to the quality of copper sulfate. In the existing analysis method standards, due to the interference of copper ions and the low content of iron to be determined, the method of HG / T3592 "Copper Sulfate for Electroplating" is used to detect the impurity content of iron, that is, it is first precipitated with ammonia solution Iron ions form ferric hydroxide precipitate and cuproammonia solution, filter and separate, dissolve the precipitate with hydrochloric acid, and use o-phenanthroline as the color reagent for colorimetric quantitative determination of the dissolved solution. The operation of this method is complicated, takes a long time, and is prone to operational errors. Contents of the invention [0003] The object of the present i...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 廖悦鉴张素娟吴阳东
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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