Reagent for measuring chemical oxygen demand (COD) and method for preparing digestion solutions of reagent

A technology of chemical oxygen demand and preparation method, which is applied in the field of chemical oxygen demand determination reagents and its digestion liquid preparation, to achieve the effects of reduced usage, good technical effect, and reduced analysis cost

Inactive Publication Date: 2015-02-04
XINYU IRON & STEEL CO LTD
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Problems solved by technology

For an enterprise that analyzes more than 30 water samples per day, it costs more than 600 yuan to consume only reagents for 3 days, which has caused a certain economic pressure on the enterprise

Method used

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Embodiment

[0019] The reagents used in the preparation of reagent J and reagent H of the present invention are analytically pure reagents that meet national standards. The purity of concentrated sulfuric acid is 98% (density ρ=1.84g / mL). The test water is distilled water or water of equivalent purity. When preparing the digestion solution, the reference substance potassium dichromate was weighed after drying at 105°C to 110°C for 2 hours.

[0020] Preparation of J reagents: prepare 6 groups of J reagents according to Table 1, and weigh the reagents with an analytical balance.

[0021] Table 1 J reagent components.

[0022] .

[0023] The components prepared by J reagent are not limited to Table 1. In actual work, enterprises can optimize according to the situation of industrial wastewater, as long as the mass fraction of potassium dichromate in J reagent is in the range of 28.0% to 36.0%, and the concentration of mercury sulfate is satisfied. The mass fraction is in the range of 64...

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Abstract

The invention discloses a reagent for measuring chemical oxygen demand (COD) and a method for preparing digestion solutions of the reagent. The reagent comprises an H reagent silver sulfate and a J reagent, wherein the mass fraction of potassium dichromate in the J reagent is 28.0%-36.0% and the mass fraction of mercury sulfate in the J reagent is 64.0%-72.0%. The preparation method of the digestion solutions of the reagent comprises the following steps: adding 1g of silver sulfate into 100ml of concentrated sulfuric acid to prepare the digestion solution of the H reagent; the preparation method of the digestion solution of the J reagent comprises the steps of dissolving the J reagent into 80mL-100mL of distilled water, adding 6.00mL-10.00mL of concentrated sulfuric acid, cooling until the temperature reaches a room temperature after dissolving, and then diluting by use of water until 120mL of solution is achieved. The dosage of the digestion solutions prepared by use of the J reagent and the H reagent of the reagent for measuring COD is greatly reduced so that the analysis cost can be greatly reduced. Compared with the national recommended standards, an ammonium ferrous sulfate standard titration solution does not need to be prepared for titration, and the analysis steps are simplified, and the reagent for measuring COD is simple, convenient and quick, and meets the requirements of an enterprise on fast detection.

Description

technical field [0001] The invention relates to a reagent for measuring chemical oxygen demand and a preparation method thereof, in particular to a reagent for measuring chemical oxygen demand and a preparation method for a digestion solution thereof. Background technique [0002] Chemical oxygen demand refers to the amount of oxidant consumed by the oxidation of reducing substances in water by oxidant, expressed in mg / L of oxygen consumption per unit volume of water. Chemical oxygen demand is also called COD. COD is the abbreviation of Chemical Oxygen Demand in English. It reflects the pollution degree of reducing substances in water. It is a routine monitoring item in water quality monitoring and an important indicator for evaluating water pollution. Reducing substances in water include organic matter, nitrite, ferrous salt, sulfide, etc. COD value can be measured by potassium dichromate method and potassium permanganate method. The potassium permanganate method is mainl...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/44
Inventor 钟小猫肖忠东刘志源张水菊胡桂英黄小山
Owner XINYU IRON & STEEL CO LTD
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