Color chart, test kit, and method of estimating chemical oxygen demand of water and waste water

A chemical oxygen demand and colorimetric card technology, applied in the field of colorimetric cards, can solve the problems of long time consumption and inability to immediately know the chemical oxygen demand detection result of the water sample to be measured on the spot.

Active Publication Date: 2019-12-10
SPRING FOUND OF NCTU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional chemical oxygen demand detection method takes a long time, and the chemical oxygen demand detection result of the water sample to be tested cannot be immediately obtained on site

Method used

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  • Color chart, test kit, and method of estimating chemical oxygen demand of water and waste water
  • Color chart, test kit, and method of estimating chemical oxygen demand of water and waste water
  • Color chart, test kit, and method of estimating chemical oxygen demand of water and waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 - Defining the color of the standard

[0051] Embodiment 1 adopts the 1mL potassium hydrogen phthalate (potassium hydrogen phthalate, KHP) aqueous solution of 50mg / L, 75mg / L, 100mg / L, 125mg / L, 150mg / L and 200mg / L COD concentration respectively as standard . The above-mentioned steps 120 to 150 in the method 100 are performed on these standards, and the colors presented by the standards are defined.

[0052] Specifically, 0.5 mL of 0.025M potassium dichromate and 1 mL of concentrated sulfuric acid were added to each standard. The mixed solution was heated to 100° C. and heated for 10 minutes. 0.3 mL of 0.025M ferrous ammonium sulfate solution was added to each standard. Then 0.1mL of phenanthroline coloring agent was added to each standard to make the standard appear color, wherein the preparation of phenanthroline coloring agent was 1.485g of 1,10-phenanthroline and 0.695 g of ferrous sulfate is obtained by distilling the volume to 100mL in reagent water. ...

Embodiment 2

[0057] In Example 2, the COD concentration detection is carried out for sewage and sewer wastewater (ie domestic wastewater), and the color of the water sample is compared with the color area of ​​the color card 200 produced in Example 1. In addition, the COD concentration detection result of embodiment 2 is further compared with the COD concentration detection result of the chemical oxygen demand detection announcement method NIEAW515.54A in water promulgated by the Environmental Protection Agency, to verify the accuracy of the COD concentration detection method of the present invention sex. It should be understood that the COD concentration detection method of the present invention belongs to the rapid screening method, and the obtained COD concentration detection result is an interval value rather than an accurate value.

[0058] In Example 2, eight water samples of sewage and sewer wastewater are provided, respectively named as sample A1 to sample A8, and the volumes are a...

Embodiment 3

[0068] The procedure of Example 3 is basically the same as that of Example 2, the only difference being that the samples in Example 3 are industrial wastewater collected from several industrial wastewater outlets. Specifically, the sources of these industrial wastewater include food processing industry (sample B1), petrochemical industry (sample B2 to sample B4), chemical dyeing and finishing industry (sample B5 to sample B7), metal surface electroplating industry (sample B8 to sample B10 ) and printed circuit board processing (sample B11 to sample B13).

[0069] Samples B1 to B13 were all tested for COD concentration according to the method 100 of the present invention and the method NIEA W515.54A promulgated by the Environmental Protection Agency for the detection of chemical oxygen demand in water. The COD concentration detection results of samples B1 to B13 are listed in Table 3.

[0070] table 3:

[0071]

[0072]

[0073] According to the COD concentration detect...

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Abstract

The present invention provides a color chart for estimating a chemical oxygen demand of water and waste water. The color chart includes a blue area, an indigo area, an umber area, and an orange area.The present invention also provides a test kit for estimating a chemical oxygen demand of water and waste water. The test kit includes an oxidant, a reductant, an indicator, and the color chart. The present invention also provides a method for estimating a chemical oxygen demand of water and waste water. The method includes providing a water sample; adding an oxidant to the water sample; heating the water sample; adding a reductant to the water sample; adding an indicator to the water sample, such that the water sample develops a color; and comparing the color of the water sample with the color areas of the color chart to estimate the chemical oxygen demand of the water sample. The color chart, the test kit, and the method provided by the present invention contribute to the on-site rapid screening of the chemical oxygen demand.

Description

technical field [0001] The invention relates to a colorimetric card, a test group and a method for judging the chemical oxygen demand in water and waste water. Background technique [0002] The higher the content of organic matter in water and wastewater, the greater the degree of water pollution. Chemical Oxygen Demand (COD) is an important indicator to measure the content of organic matter in water, which is defined as the number of oxygen equivalents of oxidants required to oxidize reducing substances in each liter of water sample, expressed in mg / Expressed in liters (mg / L). [0003] In the traditional chemical oxygen demand detection method, it is necessary to bring the water sample to be tested back to the detection room for two hours of heating and reflux, plus the time required for water sample pretreatment and titration quantification, it usually takes more than three hours to complete the test. Obtain the chemical oxygen demand in the water sample. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/01
CPCG01N21/78G01N21/01G01N2021/0112G01N33/1806G01N31/22G01N2035/00683
Inventor 游昇穆董瑞安
Owner SPRING FOUND OF NCTU
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