Test paper for determining cobalt concentration and determination method

A technology of cobalt concentration and test paper, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as large error in visual colorimetry of test paper, and achieve high accuracy degree of effect

Active Publication Date: 2019-01-11
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to solve the problem of large errors in the visual colorimetry of the test paper used in the on-site rapid detection in the field of environmental monitoring, electroplating solution detection, etc. The present in...

Method used

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  • Test paper for determining cobalt concentration and determination method
  • Test paper for determining cobalt concentration and determination method
  • Test paper for determining cobalt concentration and determination method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A test paper for measuring cobalt concentration, which is prepared from carrier and soaking solution, wherein filter paper is used as carrier, ETDA solution, ammonia-ammonium chloride buffer solution, ammonium violate, sodium alkyl sulfate (SDS) are used as Soaking solution, the mass fraction of the reagents loaded on the test paper is: 2% ETDA, 0.02% sodium alkyl sulfate, 0.05% ammonium violate;

[0041] A kind of preparation method of the test paper of measuring cobalt concentration of the present invention comprises the steps:

[0042] step 1:

[0043] Weigh 5.4g of ammonium chloride and dissolve it in 40mL of deionized water to obtain ammonium chloride solution; add 36mL of concentrated ammonia solution to the ammonium chloride solution, add deionized water to dilute to 100mL, then add dilute hydrochloric acid or dilute ammonia water to adjust the acidity Adjust the pH to 8 to obtain ammonia-ammonium chloride buffer solution;

[0044] Step 2:

[0045] Weigh 4g of E...

Embodiment 2

[0056] A test paper for measuring cobalt concentration, which is prepared from carrier and soaking solution, wherein filter paper is used as carrier, ETDA solution, ammonia-ammonium chloride buffer solution, ammonium violate, sodium alkyl sulfate (SDS) are used as Soaking solution, the mass fraction of reagents loaded on the test paper is: 5% ETDA, 1% sodium alkyl sulfate, 0.4% ammonium violinate;

[0057] A kind of preparation method of the test paper of measuring cobalt concentration of the present invention comprises the steps:

[0058] step 1:

[0059] Weigh 5.4g of ammonium chloride and dissolve it in 40mL of deionized water to obtain ammonium chloride solution; add 36mL of concentrated ammonia solution to the ammonium chloride solution, add deionized water to dilute to 100mL, then add dilute hydrochloric acid or dilute ammonia water to adjust the acidity Adjust the pH to 9 to obtain ammonia-ammonium chloride buffer solution;

[0060] Step 2:

[0061] Weigh 10g of EDTA...

Embodiment 3

[0072] A test paper for measuring cobalt concentration, which is prepared from carrier and soaking solution, wherein filter paper is used as carrier, ETDA solution, ammonia-ammonium chloride buffer solution, ammonium violate, sodium alkyl sulfate (SDS) are used as Soaking solution, the mass fraction of reagents loaded on the test paper is: 1% ETDA, 1% sodium alkyl sulfate, 0.2% ammonium violinate;

[0073] A kind of preparation method of the test paper of measuring cobalt concentration of the present invention comprises the steps:

[0074] step 1:

[0075] Weigh 5.4g of ammonium chloride and dissolve it in 40mL of deionized water to obtain ammonium chloride solution; add 36mL of concentrated ammonia solution to the ammonium chloride solution, add deionized water to dilute to 100mL, then add dilute hydrochloric acid or dilute ammonia water to adjust the acidity Adjust the pH to 10.5 to obtain ammonia-ammonium chloride buffer solution;

[0076] Step 2:

[0077] Weigh 2g of ED...

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Abstract

The invention discloses test paper for determining cobalt concentration and a determination method and relates to the technical fields of quality detection and environmental monitoring. A reagent loaded by the test paper is prepared from the following components in percent by mass: 0.5-5% of ETDA, 0.05-1% of sodium alkyl sulfate and 0.05-4% of murexide. A preparation method comprises the followingsteps: (1) preparing an ammonia-ammonium chloride buffer solution; 2) preparing a soaking liquid; 3) soaking filter paper or a filter paper strip sequentially in the soaking liquid, and drying the filter paper or the filter paper strip to obtain the test paper for determining cobalt concentration; and 4) inserting the test paper into a standard solution, and drawing a scaleplate for the determined cobalt concentration according to a linear relationship. The test method comprises the following steps: inserting the test paper into a to-be-tested solution to measure the color changing height ofthe test paper, and searching for corresponding cobalt concentration with reference to the scaleplate for cobalt test or to a parameter list. Concentration of the to-be-tested subject can be reflectedby measuring the length of the color changing belt with the scaleplate, so that defects of conventional test paper are overcome. Compared with the prior art, the test paper is higher in accuracy andthe relative standard deviation RSD is within 10%.

Description

technical field [0001] The invention belongs to the technical field of quality inspection and environmental monitoring, in particular to a test paper and a method for measuring cobalt concentration. Background technique [0002] The alloy coating containing cobalt is exquisite and durable, has strong corrosion resistance and is harmless to the human body, so it is favored by people. However, the proportion of alloys in the plating solution is not easy to control. In order to ensure the quality of the coating, the cobalt content in the plating solution must be strictly controlled; in addition, the discharge of cobalt-containing waste liquid is limited by national standards and should be discharged after recycling and treatment. Therefore, the on-site simple and rapid determination of cobalt content is an urgent problem to be solved for product quality and waste liquid wastewater treatment. [0003] At present, the determination method of cobalt concentration in electroplatin...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 余萍李建丽高俊杰
Owner SHENYANG LIGONG UNIV
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