Reagent and method for determining chemical oxygen demand of high-chloride wastewater

A technology for chemical oxygen demand and high-chlorine wastewater, which is applied in the direction of material analysis by observing the influence of chemical indicators, color/spectral characteristic measurement, and analysis by making materials undergo chemical reactions, so as to achieve short measurement time and save energy. Analyzing the effect of time

Inactive Publication Date: 2010-05-26
JIANGSU POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no one in China that can eliminate COD

Method used

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  • Reagent and method for determining chemical oxygen demand of high-chloride wastewater
  • Reagent and method for determining chemical oxygen demand of high-chloride wastewater
  • Reagent and method for determining chemical oxygen demand of high-chloride wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of COD reagent

[0030] Weigh 10 g of reagent A and reagent B respectively, wherein the mass fraction of potassium dichromate in reagent A is 35%, the mass fraction of potassium aluminum sulfate is 50%, and the mass fraction of ammonium molybdate is 15%; The mass fraction of silver is 40%, the mass fraction of bismuth nitrate is 18%, the mass fraction of potassium chromium sulfate is 12%, and the mass fraction of mercury sulfate is 30%.

[0031] Put 10g of Reagent A in a 100mL beaker, add 75mL of distilled water, and add 5mL of 98% sulfuric acid under constant stirring until dissolved; put 10g of Reagent B in a 1000mL beaker, add 500mL of sulfuric acid, dissolve overnight or slightly heat, stir well and put 500mL brown narrow mouth bottle.

[0032] 2. COD determination steps

[0033] Step 1: Weigh 0.8502g of potassium hydrogen phthalate and dissolve it in distilled water, transfer it to a 1000ml volumetric flask, and dilute to the marked line. The COD ...

Embodiment 2

[0046] 1. Preparation of COD reagent

[0047]Weigh each 4g of A reagent and B reagent respectively, wherein the mass fraction of potassium dichromate in A reagent is 25%, the mass fraction of aluminum potassium sulfate is 40%, and the mass fraction of ammonium molybdate is 35%; The mass fraction of silver is 35%, the mass fraction of bismuth nitrate is 15%, the mass fraction of potassium chromium sulfate is 10%, and the mass fraction of mercury sulfate is 40%.

[0048] Put 4g of Reagent A in a 50mL beaker, add 30mL of distilled water, and add 2mL of 98% sulfuric acid under constant stirring until dissolved; put 4g of Reagent B in a 500mL beaker, add 200mL of sulfuric acid, dissolve overnight or slightly heat, stir well and put 500mL brown narrow mouth bottle.

[0049] 2. COD determination steps

[0050] Step 1: Weigh 0.8502g of potassium hydrogen phthalate and dissolve it in distilled water, transfer it to a 1000ml volumetric flask, and dilute to the marked line. The COD va...

Embodiment 3

[0063] 1. Preparation of COD reagent

[0064] Weigh 6g of A reagent and B reagent respectively, wherein the mass fraction of potassium dichromate in A reagent is 40%, the mass fraction of aluminum potassium sulfate is 40%, and the mass fraction of ammonium molybdate is 20%; The mass fraction of silver is 40%, the mass fraction of bismuth nitrate is 20%, the mass fraction of potassium chromium sulfate is 20%, and the mass fraction of mercury sulfate is 20%.

[0065] Put 6g of Reagent A in a 100mL beaker, add 45mL of distilled water, and add 3mL of 98% sulfuric acid under constant stirring until dissolved; put 6g of Reagent B in a 500mL beaker, add 300mL of sulfuric acid, dissolve overnight or slightly heat, stir well and put 500mL brown narrow mouth bottle.

[0066] 2. COD determination steps

[0067] Step 1: Weigh 0.8502g of potassium hydrogen phthalate and dissolve it in distilled water, transfer it to a 1000ml volumetric flask, and dilute to the marked line. The COD value...

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Abstract

The invention discloses a reagent and a method for determining the chemical oxygen demand of high-chloride wastewater. The reagent consists of a reagent A and a reagent B, wherein the reagent A comprises 20 to 40 mass percent of potassium dichromate, 20 to 50 mass percent of aluminum potassium sulfate, and 10 to 60 mass percent of ammonium molybdate; and the reagent B comprises 20 to 40 mass percent of silver sulfate, 10 to 20 mass percent of bismuth nitrate, 10 to 20 mass percent of chromium potassium sulfate, and 20 to 60 mass percent of mercury sulfate. The method comprises the steps of: during the determination, sequentially adding the reagent A and the reagent B into a water sample, placing the obtained solution into a digestion device for digestion, cooling the obtained product, and then performing colorimetric determination. The reagent and the method are suitable for wastewater with the chloride ion concentration of between 1,000 and 10,000mg/L; and the reagent has the characteristics of accurate formula proportion, accurate and reliable determined data, short determination time, simple determination steps, convenient operation and the like; and the method can perform batch determination.

Description

technical field [0001] The invention relates to a reagent and a method for measuring chemical oxygen demand (COD) in high-chlorine wastewater. The chemical oxygen demand is an important parameter for measuring the index of organic pollutants in water bodies. Background technique [0002] At present, the domestic COD determination method has KMnO 4 and K 2 Cr 2 o 7 Law. KMnO 4 The method is mainly used to evaluate the quality of drinking water, raw water and surface water. Its COD value ranges from 0.5 to 4.5 mg / L, which is not suitable for industrial analysis. K 2 Cr 2 o 7 As the national standard of GB11914-89, the determination range is 30-700mg / L, which is used for industrial analysis. In the process of measuring COD by the national standard method (potassium dichromate method), the Cl present in the water sample is easily oxidized by the oxidant, thus consuming the amount of the oxidant and resulting in a high measurement result, and it also interacts with Ag 2...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/25
Inventor 雷春生王桂玉郭晓波
Owner JIANGSU POLYTECHNIC UNIVERSITY
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