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Method for rapidly detecting total concentration of chromium in water and detection kit

A detection kit and detection method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of data precision reduction, difference in weighing amount of chromogenic agent, etc., to increase judgment, save the removal process, and achieve scientific and accurate results Effect

Active Publication Date: 2014-08-27
宁波市环境监测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If diphenylcarbazide powder is used directly, the storage period can be extended to about 3 months, but the precision of the data will be reduced due to the slight difference in the weighing amount of the color developer.

Method used

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  • Method for rapidly detecting total concentration of chromium in water and detection kit
  • Method for rapidly detecting total concentration of chromium in water and detection kit
  • Method for rapidly detecting total concentration of chromium in water and detection kit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1: Determination of standard curve and standard sample.

[0074] Experimental instruments and materials: DR3900 portable spectrophotometer, DRB200 digester, total chromium rapid detection kit (ie detection kit, the same below), total chromium standard solution (use trivalent chromium configuration, concentration 5.00mg / L), total chromium Chromium standard sample (GSB07-1187-2000 201617, 0.597mg / L±0.030).

[0075] Experimental steps:

[0076] (1) Configure the total chromium standard sample as required to be 1.35mg / L±0.11; at the same time, randomly select a prefabricated tube and check the pH of the oxidant in it. If the pH<1, it means that the oxidant has deteriorated.

[0077] (2) Take 5ml of total chromium standard sample (GSB07-1187-2000 201617) in the reagent prefabricated tube, and add 0.2ml of copper sulfate solution.

[0078] (3) Turn on the heating digester (with a 16mm round hole slot), and set the temperature to 165°C. When the temperature reach...

Embodiment 2

[0091] Embodiment two: the mensuration of total chromium in waste water.

[0092] Experimental instruments and materials: DR3900 portable spectrophotometer, DRB200 digester, total chromium rapid detection kit, a certain printing and dyeing wastewater, a certain electroplating wastewater, a certain metal surface treatment wastewater, a sewage plant influent, a certain sewage plant effluent.

[0093] Experimental steps:

[0094] (1) After the sample is collected, conduct a preliminary analysis of the pH of the water sample. If the pH is greater than 12 or less than 1, adjust the pH to 5-9 with hydrochloric acid or sodium hydroxide. At the same time, randomly select a prefabricated tube to check the pH of the oxidant in it. If the pH is less than 1, it means that the oxidant has deteriorated.

[0095] (2) Take 5ml of the pretreated water sample (high concentration samples need to be diluted in advance) and place it in the reagent prefabricated tube, and add 0.2ml of copper sulfa...

Embodiment 3

[0107] Embodiment three: Determination of surface water total chromium.

[0108] Experimental instruments and materials: DR3900 portable spectrophotometer, DRB200 digester, total chromium rapid detection kit, reservoir sample 1, reservoir sample 2, river sample 1, river sample 2, total chromium standard solution (use trivalent chromium configuration, concentration 5.00mg / L).

[0109] Experimental steps:

[0110] (1) After the sample is collected, conduct a preliminary analysis of the pH of the water sample. If the pH is greater than 12 or less than 1, adjust the pH to 5-9 with hydrochloric acid or sodium hydroxide. At the same time, randomly select a prefabricated tube to check the pH of the oxidant in it. If the pH is less than 1, it means that the oxidant has deteriorated.

[0111] (2) Take 5ml of the pretreated water sample (high concentration samples need to be diluted in advance) and place it in the reagent prefabricated tube, and add 0.2ml of copper sulfate solution. ...

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Abstract

The invention relates to a method for rapidly detecting the total concentration of chromium in water. The method comprises the following steps that water to be detected is sampled, and the pH value of the water sample to be detected is detected through a pH test strip and is adjusted; 5 ml of the water sample to be detected is placed in a prefabricated tube containing 2 ml of potassium persulfate solution in advance, and 0.2 ml of copper sulfate solution is added to the water sample to be detected; a heating digester is switched on, the temperature is set to be 165 DEG C, after the temperature reaches 165 DEG C, the prefabricated tube containing the mixed water sample is inserted into a heating digestion groove, the prefabricated tube is sealed, and then digestion lasts for 10 minutes; after digestion, the prefabricated tube is taken out and cooled to the indoor temperature, 0.05 ml of phosphoric acid solution is added, and 0.2 ml of diphenylcarbazide color-developing solution is added after even mixing; after the mixed solution stands for 10 minutes, the prefabricated tube containing the mixed solution is inserted into a colorimetric groove of a photometer, a blank is used as a contrast, and colorimetric analysis is conducted at the position with the distance of 540 nm; the absorbance of the water sample to be detected is substituted into a total chromium concentration standard curve and is multiplied by dilution ratio, and then the total concentration of chromium is obtained. According to the method for rapidly detecting the total concentration of chromium in water, the detection speed is high, and the application quantity of a poisonous agent is small. The invention further provides a detection kit which is convenient to carry and use and is used for the method for rapidly detecting the total concentration of chromium in water.

Description

technical field [0001] The invention relates to the field of chemical component detection, in particular to the detection of environmentally friendly water and waste water, in particular to a rapid detection method for total chromium in water and a detection kit. Background technique [0002] Chromium is a heavy metal element. Its toxicity has a great relationship with its existing state. Hexavalent chromium is highly toxic and has been recognized as a carcinogen. It can accumulate in the body and is highly corrosive to the skin and mucous membranes. . However, trivalent chromium can be converted into hexavalent chromium under the influence of water pH, organic matter, redox substances, temperature and hardness. Therefore, in order to comprehensively evaluate the toxicity of chromium, it is necessary to analyze the total chromium in water. [0003] The determination methods of total chromium include spectrophotometry, atomic absorption spectrophotometry, plasma emission spe...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 赵洋甬杨惠胡建林沈碧君赵建平潘双叶罗宏德翁燕波徐能斌卢珊青
Owner 宁波市环境监测中心
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