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Products > Key brands - water analyzer > HACH > DRB200 COD digestion
Product name : DRB200 COD digestion
Item : 美国哈希(HACH)
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Details:
 Details:
 Chemical oxygen demand (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. Chemical oxygen demand 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 produced during the test COD secondary pollution to a minimum. Hach COD micro reflux test can provide a complete analysis of law programs, including COD reactor, spectrophotometer and ancillary reagents.
 
Its main features are:
● No reagent preparation: COD test chemical components required by a certain percentage of pre-prepared from reagent tubes can greatly save reagent preparation time required;
● Save time: the entire measurement process, including the digestion of water samples, colorimetric determination of other steps, the time required less than three hours;
● Compact digestion device: Hach COD reactor developed to replace the traditional COD reflux device, simultaneous digestion of up to 25 water samples;
● on the environment of secondary pollution: Micro reflux requires only a small amount of reagents, reagent tubes designed to prevent volatile organic compounds as well as the escape of samples to ensure that the digestion process safety;
● simple, easy to learn: Illustrated Guide easy to grasp in a short time COD method of analysis.
 
1. COD analysis of micro-reflux procedure:
The first step: reagents, preparation of water samples in each reagent tube 3mL COD reagents, unscrewed the cap, add 2mL water samples, tighten the cap (when using the 0-15000mg / L of COD reagent tubes, only 0.2mL of water to be added).
 
Step two: water samples digested
COD will be equipped with water sample in a test tube in the COD reactor, 150 ℃ heated under reflux conditions for hours after the end of the digestion process COD reactor shut down automatically. COD reactor to remove COD reagent tube, cooled to room temperature.
 
The third step: COD Determination
Open a colorimeter or spectrophotometer, enter COD test procedures, without having to establish a standard curve, simply reagent tube into the instrument can be read out in a concentration expressed in units of COD value, record the results.
 
2. COD analysis system
Hach COD can provide the analysis of micro-reflux system, including digestion, spectrophotometer and ancillary reagents.
 
2.1 DRB200 digestion
Hach Company DRB200 digestion is newly developed digestion device, can be COD, TOC, total nitrogen and total phosphorus in water samples of the digestion process, digestion temperature, digestion time can be 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 (DRB200 digestion of product type and order number see Table 4 below).
 
Table 4 DRB200 product type and Order
Order
Heating block number
13mm Holes
16mm Holes
20mm Holes
LTV082.52.30001
1
/
9
2
LTV082.52.40001
1
/
15
0
LTV082.52.42001
2
/
21
4
LTV082.52.44001
2
/
30
/
DRB200-05
1
9
/
2
DRB200-06
2
21
/
4
DRB200-07
2
30
/
/
DRB200-08
2
12
/
8
 
Digestion adapter (Order No.: 2895805): 16mm hole can be converted to 13mm holes for digestion TNTplus prefabricated reagents.
 
DRB200 technical parameters:
Heating rate: 10 minutes in the 20 ℃ heated to 150 ℃
Temperature Stability: ± 2 ℃
Stored programs: COD program (150 ℃, 120 min.)
           100 ℃ program (100 ℃, 30,60,120 min)
           105 ℃ Program (105 ℃, 30,60,120 minutes)
           Program 150 ℃ (150 ℃, 30,60,120 min)
           165 ℃ program (165 ℃, 30,60,120 min)
Power Requirements :100-240V, 50/60HZ
Operating environment: 10 ~ 45 ℃, maximum humidity 90%, non-condensing
 
2.2 Hash series colorimeter / spectrophotometer
Hach Company offers a variety of models colorimeter and spectrophotometer determination of COD, these products include: DR/5000 UV-visible spectrophotometer, DR/4000V spectrophotometer, DR/2800 Portable Spectrophotometer , DR/890 portable colorimeter, DR/850 portable colorimeter and so on. The characteristics of various types of equipment, technical parameters and ordering information, see the sample spectrophotometer / colorimeter relevant sections, each instrument COD measuring range in Table 5 below.
 
Table 5 provides a variety of models Hach spectrophotometer / colorimeter COD measurable range
Range (mg / L)
DR5000
DR2800
DR890
DR850
Chemical oxygen demand (CODCr)
0.7-40.0
 
 
3-150
 
20-1500
200-15000
 
NOTE: ● represents the lower range for COD measurements.
 
2.3 Hach COD reagent tube prefabricated
Hach COD in range offers four pre-reagent tubes, reagent type and number as shown in Table 6.
 
Table 6 Hach COD reagent tube type and number of prefabricated
Order
Range (mg / L)
Number of reagent tube / pack
24159-25
200-15000
25 (16mm)
24159-15
200-15000
150 (16mm)

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