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COD quick detection solution, test box and determination method

A test box and detection liquid technology, which is applied in the direction of chemical reaction of materials and material analysis by observing the impact on chemical indicators, can solve the problems of inflexibility, long time and high cost, and achieve easy portability. , The effect of low detection cost and wide detection range

Active Publication Date: 2013-09-04
BEIJING SUNPU BIOCHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of high cost, long time, and inflexibility in the COD measurement process, the present invention provides COD rapid detection solution, test box and measurement method. The present invention is based on potassium permanganate oxidizing reducing substances in water under alkaline conditions. And according to the amount of reducing substances, manganese in different valence states can be obtained, and the characteristic of showing different colors is designed

Method used

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  • COD quick detection solution, test box and determination method
  • COD quick detection solution, test box and determination method
  • COD quick detection solution, test box and determination method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0060] (1) Water sample to be tested: industrial wastewater from a chemical plant.

[0061] (2) COD rapid detection solution:

[0062] Test solution No. Ⅰ: 5% sodium hydroxide aqueous solution;

[0063] Test solution No. Ⅱ: 0.2% potassium permanganate aqueous solution;

[0064] (3) Preparation method of COD rapid detection solution:

[0065] No. 1 test solution: weigh 15g of sodium hydroxide, add water to 100g in a beaker, dissolve and mix to obtain No. 1 test solution;

[0066] No. Ⅱ test solution: weigh 0.2g of potassium permanganate, add water to 100g in a beaker, dissolve and mix to obtain No. 2 test solution;

[0067] (4) COD rapid test box, including at least two dropper bottles or containers with droppers (containing the above-mentioned No. 1 test solution and No. 2 test solution respectively); at least one colorimetric cup or colorimetric tube; and colorimetric card . Cuvette or tube, with a volume of about 5-15mL, with 5mL and 10mL scale marks.

[0068] (5) Prep...

Embodiment 2

[0080] Except the preparation of color comparison card, other is the same as embodiment 1.

[0081] Preparation of color charts:

[0082] ①Prefabricated color card:

[0083] The color comparison card prepared by the method of Example 1 is used as a prefabricated color comparison card.

[0084] ② Calibration color card:

[0085] Take a water sample to be tested, and measure its COD value to 180mg / L according to the national standard "Determination of Water Quality Chemical Oxygen Demand Dichromate Method" (GB11914-89), and measure it with a prefabricated color card according to the method of Example 1 Its COD value is 120mg / L. Compared with the two measurement results, the correction coefficient is 1.5 (i.e. 180 / 120). The COD value of the prefabricated color card (i.e. the standard COD solution COD value) is multiplied by the correction coefficient 1.5 to obtain the correction After the COD value of the color comparison card, the corresponding color comparison card is formul...

Embodiment 3

[0095] Except the preparation of color comparison card, other is the same as embodiment 1.

[0096] Preparation of color charts:

[0097] ①Prefabricated color card:

[0098] The color comparison card prepared by the method of Example 1 is used as a prefabricated color comparison card.

[0099] ② Calibration color card:

[0100] Take 3 different water samples to be tested, and measure their COD according to the national standard "Determination of Water Quality Chemical Oxygen Demand Dichromate Method" (GB11914-89) Cr value, then measure its COD with a prefabricated color card according to the method of Example 1 1 Value, compare the two measurement results, and take the average, get the correction coefficient (see Table 5), the prefabricated color card COD 1 Value (i.e. standard COD solution COD value) multiplied by the correction coefficient, respectively, to get the corrected color card COD value, in order to formulate the corresponding color card. Table 6 below.

[010...

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Abstract

The invention relates to a COD (chemical oxygen demand) quick detection solution, a test box and a determination method, based on the characteristic that potassium permanganate oxidizes reducing substances in water under an alkaline condition, and presents different colors when manganese with different valence states is obtained with the quantity of the reducing substances. The COD quick detection solution comprises a No. I test solution (alkaline solution or alkaline buffer solution) and a No. II test solution (potassium permanganate aqueous solution). The COD quick detection solution, the test box and the determination method have the characteristics that the COD quick detection solution, the test box and the determination method are independent of an instrument, low in cost, convenient, quick and flexible, and can achieve detection within multiple different COD concentration ranges.

Description

technical field [0001] The invention relates to a water quality COD measurement technology, in particular to a COD rapid detection solution, a test box and a measurement method. Background technique [0002] Chemical Oxygen Demand (Chemical Oxygen Demand) is referred to as COD, which reflects the degree of water pollution by reducing substances. [0003] The traditional detection of COD mainly includes potassium dichromate method and potassium permanganate method, and the potassium permanganate method is divided into acid potassium permanganate method and alkaline potassium permanganate method. Potassium dichromate method is used in the national standard "Determination of Chemical Oxygen Demand of Water Quality by Dichromate Method" (GB11914-89). Afterwards, titrate with ferrous ammonium sulfate standard titration solution. The national standard "Determination of Chemical Oxygen Demand (COD) in Industrial Circulating Cooling Water Potassium Permanganate Method" (GB / T15456-...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 潘咏梅蔡萌萌裴双秀胡文静蒙雪艳
Owner BEIJING SUNPU BIOCHEM TECH