Test paper for determining cobalt concentration and determination method

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...

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