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Digestion solution formula for fast determining chemical oxygen demand

A technology for rapid determination of chemical oxygen demand, applied in the direction of chemical analysis using catalysis, can solve the problems of incomplete oxidation reaction, secondary pollution, high analysis cost, and achieve low price, easy decomposition, and accelerated reaction speed. Effect

Inactive Publication Date: 2010-09-22
程俊彪
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Problems solved by technology

[0004] The existing digestion solution formula is to use silver sulfate as a catalyst, add silver sulfate to sulfuric acid to form a silver sulfate-sulfuric acid solution, and use potassium dichromate sulfuric acid solution as an oxidant, but the digestion reaction time of this pre-installed mixed reagent is long , the oxidation reaction is not complete, and the amount of silver sulfate is high, causing secondary pollution and high analysis costs. In order to overcome the above-mentioned shortcomings, a new type of digestion solution formula for rapid determination of chemical oxygen demand should be developed

Method used

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Embodiment Construction

[0020] The present invention chemical oxygen demand rapid determination digestion solution formula embodiment is as follows:

[0021] 1. Catalyst

[0022] Weigh 2.00g to 2.15g of silver sulfate and dissolve it in 500ml of high-grade pure concentrated sulfuric acid, and shake it at intervals to dissolve it to form a solution.

[0023] (2) Oxidizing agent

[0024] After drying potassium dichromate at 120°C±2°C to constant weight, weigh 2.45 grams of potassium dichromate and place it in a beaker, add 50 ml of water, slowly add 400 ml of sulfuric acid under stirring, dissolve and cool, transfer This solution was diluted with water to the mark in a 500ml volumetric flask, and shaken to make a solution. The solution is stable for 6 months.

[0025] (3) Co-catalyst

[0026] Weigh 0.80 g ~ 15.15 g aluminum potassium sulfate (KAI (SO 4 ) 2 12H 2 O), 0.48 grams to 10.23 grams of ammonium tetramolybdate ((NH 4 ) 2 MO 4 o 13 2H 2 0), 2.25 grams to 5.15 grams of citric acid, af...

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Abstract

The invention provides a digestion solution formula for fast determining chemical oxygen demand, relating to the field of digestion solution formulas of chemical oxygen demand after dissolved substances and suspended substances in a water sample are treated by potassium dichromate oxidation treatment. The digestion solution formula for fast determining chemical oxygen demand comprises the following three prepared solutions: a solution as a catalyst prepared by dissolving 2.00-2.15g of silver sulfate in 500ml of sulfuric acid, a solution as an oxidant prepared by dissolving 2.45g of potassium dichromate dried to constant weight in 100ml of water and 400ml of the sulfuric acid and a solution as a cocatalyst prepared by dissolving 0.80-15.15g of aluminum potassium sulfate, 0.48g of ammonium tetramolybdate and 2.25-5.15g of citric acid in 500ml of concentrated sulfuric acid. The digestion solution formula has the advantages of short reaction time, stable reaction and less silver sulfate dosage.

Description

Technical field: [0001] The invention discloses a chemical oxygen demand rapid determination digestion liquid formula, which relates to the field of the chemical oxygen demand digestion liquid formula required for soluble substances and suspended matter in water samples after being oxidized with potassium dichromate. Background technique: [0002] In coking, papermaking, petrochemical, printing and dyeing, fur, tanning, reagent, food and other processing industries, it is necessary to measure the content of organic matter in industrial wastewater, which requires the development of a method for adding Digestion formulations for the determination of chemical oxygen demand. [0003] The basic principle of spectrophotometric determination of the chemical oxygen demand in the tested water sample is to add a known amount of potassium dichromate solution to the water sample, in a strong sulfuric acid medium, use silver sulfate as a catalyst, and after high temperature digestion, T...

Claims

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Application Information

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IPC IPC(8): G01N31/10
Inventor 程俊彪
Owner 程俊彪
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