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Electroplating wastewater cyanide detection method and kit

A detection kit and electroplating wastewater technology, which is applied in the field of analytical chemistry, can solve the problems of distrust and high detection cost, and achieve the effects of simple and fast operation, many detection times, and easy promotion

Active Publication Date: 2014-08-27
XIAMEN BAST CLEAN ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have the following two problems: one is that the detection cost is high, about 10 yuan each time; the other is that the above two detection methods are different from people's general detection habits, that is, to observe the color in a translucent plastic tube Change and use for color comparison, it is easy to make people feel distrustful

Method used

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  • Electroplating wastewater cyanide detection method and kit
  • Electroplating wastewater cyanide detection method and kit
  • Electroplating wastewater cyanide detection method and kit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of kit: (for 10mL test solution)

[0036] (1) The first reagent: anhydrous potassium dihydrogen phosphate (KH 2 PO 4 )34g with anhydrous disodium hydrogen phosphate (Na 2 HPO 4 ) 35.5g dissolved in pure water and diluted to 100mL, the dosage is 10 drops / time; this reagent is a buffer solution, which stabilizes the pH value of the tested solution, so that the pH value of the tested solution does not change due to volume changes, so as to meet the reaction requirements . Dissolving 34g of potassium dihydrogen phosphate and 35.5g of disodium hydrogen phosphate in 100mL of pure water, the concentration requirement is 10 times that of the original, which is relatively difficult. Process, the exothermic process when disodium hydrogen phosphate dissolves, add the two reagents while stirring until they are all dissolved, the reagents must be kept in plastic bottles;

[0037] (2) The second reagent: Chloramine T0.5g, EDTA-2Na1g, sodium chloride 48.5g and mix wel...

Embodiment 2

[0040] Carry out the detection of cyanide in electroplating wastewater with the kit prepared in Example 1: the specific process is as follows:

[0041] (1) Use a 100mL beaker to take a water sample of about 50mL, add a little granular activated carbon, stir well, and let it stand for a few minutes for testing;

[0042] (2) Add 2 drops of 1% phenolphthalein solution to produce red color, add dropwise with 0.5mol / L acetic acid until the red color disappears. This neutralization step can be omitted if the pH value of the water sample shows neutrality. (The following detection methods need to be carried out under neutral conditions)

[0043] (3) Control the cyanide concentration below 1ppm to obtain the tested solution.

[0044] (4) From the above-mentioned pretreated test solution, take 10mL with a 25mL colorimetric tube.

[0045] (5) Add 10 drops of the first reagent dropwise and shake well.

[0046] (6) Pour the second reagent into the colorimetric tube, stopper and shake w...

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Abstract

The invention discloses an electroplating wastewater cyanide detection method and kit. The method comprises the following steps: (1) firstly, reacting cyanide and chloramine-T in detected electroplating wastewater with the pH of 6.8-7.5 to generate cyan chloride; (2) secondly, reacting cyan chloride and isonicotinic acid, and hydrolyzing to generate 3-carboxyl pentene dialdehyde, so that the detected electroplating wastewater becomes red from orange red; and (3) thirdly, carrying out a dehydration condensation reaction on 3-carboxyl pentene dialdehyde and pyrazolone so as to generate a blue compound to perform colorimetric detection. The detection method provided by the invention conforms to the requirement for detecting cyanide in water by the national standard. The detection method of the kit provided by the invention is very simple and convenient to operate, can be implemented rapidly and conforms to the general operation habit of people. The actual consumption of a reagent in the kit provided by the invention is low, the kit can be used for detection for multiple times, the reagent cannot deteriorate at room temperature and can be used for a long time, and the kit meets the requirement on rapid field detection and is low in price and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for detecting cyanide in electroplating wastewater and a kit thereof. Background technique [0002] At present, in the domestic electroplating industry, the detection of cyanide in electroplating wastewater is basically determined according to GB / T7486-1987 "Determination of Cyanide in Water Quality by Silver Nitrate Titration Method", GB / T7487-1987 "Determination of Cyanide in Water Quality" of. These two methods all need to use the traditional distillation method to first purify the cyanide and get rid of other interfering ions, and then use the silver nitrate titration method or the isonicotinic acid-pyrazolone colorimetric method to determine the content of cyanide in the wastewater. The whole process of these two methods takes a long time (3-4 hours), and must be carried out in the laboratory. The experimental process is more complicated an...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 俞国柱
Owner XIAMEN BAST CLEAN ENVIRONMENTAL TECH
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