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Method for determining chemical oxygen demand of soil

A chemical oxygen demand and measurement method technology, applied in the restoration of polluted soil, soil material testing, measuring devices, etc., to achieve the effect of convenient operation, low cost and accurate measurement results

Inactive Publication Date: 2016-11-23
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the soil organic matter content measured by the existing soil organic matter detection method cannot be directly converted into the soil's demand for chemical oxidants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment provides a kind of assay method of soil chemical oxygen demand, comprises the steps:

[0027] 1) Dry and pulverize the soil sample to be tested.

[0028] Specifically, dry the soil sample to be tested at 100-110°C for 24 hours, then remove the stones in the dried soil sample, crush the soil sample manually or mechanically, and pass the crushed soil sample through 10 mesh (2mm) The sieve is sieved, so that the subsequently added oxidant solution reacts more fully with the organic matter in the soil sample.

[0029] 2) Weigh the mass as m 土壤 After the pretreatment, the soil sample to be tested is placed in a reaction container, which may be a glass bottle.

[0030] 3) Take a volume V of the oxidant solution and place it in the reaction vessel of step 2) and mix it with the soil sample to be tested as a measurement group, and another take a volume V of the oxidant solution and place it in an empty reaction vessel as a blank control group.

[0031]...

Embodiment 2

[0038] This embodiment is specifically aimed at a polluted site using the above-mentioned soil chemical oxygen demand determination method to measure and calculate the demand of the polluted site soil for chemical oxidants. The specific process is as follows:

[0039] First, select clean soil samples around the polluted site and dry them at 105°C±5°C for 24 hours, remove the stones in the dried soil samples, crush the soil samples manually or mechanically, and pass the crushed soil samples through 10 mesh (2mm) Sieve, weigh m 土壤 =50g of dried and sieved soil samples were placed in 250ml glass bottles, and three groups were set.

[0040] Then, add 100ml of 20g / L potassium permanganate solution (i.e. volume V=100ml) to the above-mentioned three groups of glass bottles with soil samples, seal and mix evenly, and add 20g / L potassium permanganate solution to an empty 250ml glass bottle. 100ml of potassium permanganate solution was sealed as a blank control group, and these reactio...

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Abstract

The invention provides a method for measuring soil chemical oxygen demand, which includes the following steps: 1) dry and pulverize the soil sample to be measured; 2) weigh the mass m 土壤 The soil sample is placed in the reaction container; 3) Take a volume V of the oxidant solution and mix it with the soil sample to be tested as the measurement group, and take another volume V of the oxidant solution as the blank control group; 4) Take the mixed solution of the measurement group every t days Centrifuge and filter to obtain the clarified liquid; 5) Measure the oxidant concentration c(t) in the clarified liquid 测量 And the oxidant concentration c(t) in the blank control group 空白 ;6) Calculate the soil chemical oxygen demand COD(t) on day t. This determination method directly uses the remediation agent used in the chemical oxidation remediation technology of organically contaminated soil to react with the organic matter and reducing substances in the soil. It can directly measure the chemical oxygen demand of the target soil for the remediation agent and solve the existing soil organic matter detection problem. The soil organic matter content measured by this method cannot be directly converted into the soil's demand for chemical oxidants.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, and in particular relates to a method for measuring soil chemical oxygen demand. Background technique [0002] With the development of my country's industry and agriculture and the acceleration of urbanization, as well as the adjustment of my country's industrial structure and the acceleration of urbanization, large and medium-sized cities across the country have implemented the policy of "retreating from two to three" and "retreating from cities and entering parks". A large number of polluting enterprises involved in chemical industry, metallurgy, petroleum, transportation, light industry and other industries have been relocated or closed down successively. There are a large number of organic pollutants in the soil left by the relocation of many industrial enterprises. These pollutants are constantly migrating and transforming, and can enter other environmental media through the air-soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N1/28B09C1/08
CPCG01N33/24B09C1/08G01N1/286
Inventor 王文坦邵雁李社锋陶玲郭华军朱文渊
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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