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Product name : Chemical oxygen demand (COD) analysis system
Item : 美国哈希(HACH)
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Chemical oxygen demand (COD) analysis system

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COD (Chemical Oxygen Demand, i.e. COD,) refers to the acid and heat conditions, with potassium dichromate as the oxidizing agent when the water consumed amount of oxidant to oxygen mg / L to represent. COD is often used as a comprehensive evaluation of the relative content of organic matter indicators, CODCr China's implementation of emission control is one of the indicators.

Hach COD developed micro reflux test method, the process is simple, fast, economical, measurement results with the traditional titration method has a good comparison, but also can be COD (chemical oxygen demand) testing process produces secondary pollution reduction to a minimum. Hach COD micro reflux test can provide a complete analysis of law programs, users do not need self-made COD reagents. The program includes Hach spectrophotometer / colorimeter, DRB200 digestion and supporting the hash COD prefabricated reagents. The new hash COD digestion reagent, spectrophotometer supporting the use of analytical procedures is simple, convenient, consistent with the requirements of Chinese industry standards.

Main features:

● No reagent preparation COD: COD (chemical oxygen demand) analysis of chemical components required by a certain percentage of pre-prepared from reagent tubes can greatly save COD reagent
Preparation time required;
● Time saving: the entire analytical process, including the digestion of water samples, colorimetric and other steps, the time required is less than three hours;
● Compact digestion device: Hach COD reactor developed to replace the traditional COD furnace DRB200 reflux device,
Up to 30 simultaneous digestion of water samples;
● secondary pollution on the environment small: only need a small amount of micro-reflux COD reagents designed COD reagent tube prevents volatile organic compounds
And the escape of the sample to ensure the safety of the digestion process;
● simple, easy to learn: Illustrated Guide easy to grasp in a short time COD (chemical oxygen demand) method of analysis.

Hach COD (chemical oxygen demand) analysis of micro-reflux procedure:

(1) COD reagent preparation of water
Each prefabricated COD COD reagent tube already contains ingredients needed for analysis reagents, unscrewed the cap, add 2mL water samples, tighten the cap (when using the 0-15000mg / L of COD prefabricated reagent tube, just add 0.2 mL water sample).

(2) water sample digestion
The COD of water samples have been added to preformed reagent tube in the COD reactor DRB200, according to the requirements of the reagent select the appropriate digestion temperature and time of heat reflux digestion process is finished, DRB200 digestion turns off automatically. From DRB200 digestion of COD test tube, cooled to room temperature.

(3) COD (chemical oxygen demand) colorimetric assay
Open Hach spectrophotometer or colorimeter (DR5000/DR3900/DR2800/DR2700/DR890/DR850/DR1010), the main menu, select the appropriate COD (chemical oxygen demand) test procedures, without having to establish a standard curve, Just COD reagent test tube into the instrument can be read out in a concentration expressed in units of COD value, record the results.

Hach COD analysis of micro-reflux Introduction

Hach COD (chemical oxygen demand) analysis of micro-reflux system includes Hach spectrophotometer / colorimeter, digestion and supporting prefabricated COD reagents. (1) Series Spectrophotometer Hach Company / Hach colorimeter according to different customer needs, providing a variety of models and colorimeter and spectrophotometer for COD (chemical oxygen demand) the determination of these instruments including: DR5000 UV - visible spectrophotometer, DR3900 desktop visible spectrophotometer, DR2800 portable spectrophotometer, DR2700 portable spectrophotometer, DR890 portable colorimeter, DR850 portable colorimeter, DR1010 COD analyzer and so on. Different types of instruments range of measurable COD will be different, see table below




Range (mg / L)


DR5000


DR3900


DR2800


DR2700


DR890


DR850


DR1010




CODcr prefabricated reagent (150 ℃, 2 hours)


0.7-40

























3-150

























20-1500

























200-15000

























Rapid digestion CODcr prefabricated reagents (165 ℃, 15 min.)


15-150

























100-1000

























Mercury COD Digestion Reagent prefabricated (150 ℃, 2 hours)


25-1000
























(2) hash DRB200 digestion DRB200 digestion is newly developed Hach digestion device, can be COD (chemical oxygen demand), TOC, total nitrogen and total phosphorus in water samples of the digestion process, digestion temperature and digestion time respectively at 37-165 ℃ ,0-480 minutes in selection. According to the needs of users, in the digestion DRB200 configure a heating block or two independent heating block, heating blocks with three kinds of extinction sizes, respectively, using prefabricated with barcode TNTplus COD reagent (13mm), for Common TNT pre tube (16mm), for metal pretreatment pre-digestion tube (20mm).

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