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COD is a parameter that lets us evaluate the pollution
levelcaused by organic and inorganic substances of awaterway
(wastewater or surface water).
The abbreviation COD stands for the chemical oxygendemand for
oxidation of substances dissolved andsuspended in water (COD:
Chemical Oxygen Demand). Bydetermining the COD it is possible to
proportionchemically oxidable substances with energy oxidants
suchas potassium bichromate in a strongly acidic solution.
The acid environment is caused by the presence ofconcentrated
sulfuric acid.Both inorganic compounds and organic substances canbe
oxidized. This determination allows us to also detectorganic
substances using the equivalent biological method(BOD: Biological
Oxygen Demand), such as, for example,cellulose.Since oxidation
takes place in drastic conditions, it is morecomplete than
biological oxidation, and as a consequencethe COD value of a given
sample is, in most cases, higherthan the corresponding BOD
value
Thermoreaction (digestion) of a sample
The sample digestion phase is one of the most importantsteps in
many chemical reactions. Digestion is conductedin order to convert
low-solubility compounds orsubstances present in the form of
aggregates into solublecompounds, to degrade organic substances
into inorganicmolecules, or to eliminate interfering substances
andsolubilize metallic ions. Digestion takes place by
addingdecomposition reagents to the sample and thencontrolling the
temperature of the mixture prepared thisway.
WHAT IS COD?
08 LineaAmbiente
Environment Line
Thermoreactors
ECO series thermoreactors
Velp Scientifica programmable thermoreactors are acutting edge
solution as they are fit for meeting themost diversified
temperature control needs.
ECO thermoreactors have been particularly studiedfor COD
analysis and for preparing samples by wayof wet digestion for
determining metallic and non-metallic elements in organic and
inorganic materialssuch as minerals, alloys, animal feeds,
soils,sediments and organic tissues.
The solutions Velp offers are able to ensure a highdegree of
accuracy and repeatability of the results.
Velp Scientifica thermoreactors combine perfectlywith
Macherey-Nagel Nanocolor kits for analyzingparameters such as COD,
nitrogen and totalphosphorus, metals, hydrocarbons, AOX and
TOC.
Velp Scientifica is infact the Macherey-Nagel officialpartner
for Italian market.
When used in combination with the Nanocolor
Macherey-Nagel kits for analyzing COD (COD 40,60, 160 and 1500),
Velp Scientifica thermoreactorsare recognized with approval of
conformity assatisfactory for the ST-COD method Calculation ofthe
chemical oxygen demand for water quality ISO15075.
COD in 30 minutes!
Thanks to the introduction of the new temperature of160C, the
thermoreactors ECO series let youanalyze the COD in just 30
minutes.
Thermoreactors ECO Series
Power supply 230V or 115V 230V -115V automatic voltage
adjustment 230V or 115V 230V -115V automatic voltage adjustment
Power W 700 140 550 400
Dimensions (WxHxD) mm (in) 198x132x319 (7.8x5.2x12 .6 )
135x95x230 (5.3x3.7x9.1) 168x110x269 (6.6x4.3x10.6) 155x95x275
(6.1x3.7x10.8)
Weight Kg (lb) 5,6 (12,3) 2 (4,4) 3,8 (8,4) 3,6 (7,9)Display YES
YES
N of samples 6 tubes of 200ml 8 test tubes 16mm 14 test tubes
16mm 25 test tubes 16mm
18* test tubes of 16mm 1 test tubes 22mm 2 test tubes 22mm
** 6 test tubes 22mm
Selectable Temperature from room temp. to 200C 70-
100-120-150-160C from room temp. to 160C 70- 100-120-150-160C
Selectable Time up to 199 min or continuos 30 - 60- 120 or
continuous up to 199 min or continuous 30 - 60- 120 or
continuous
Warning signal at the end of the YES YES YES YES
work cycle with automatic switch-off
*with n 6 acc. A00001044 (see pag. 8)
**with n 6 acc. A00001046 (see pag. 9)
ECO
6
Description
ECO
8
ECO
16
ECO
25
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The ECO 8 and ECO 25 thermoreactors let you run testto determine
parameters such as, for example, COD andnitrogenous and
phosphorated compounds, in total safetyand reliability conditions
that are ensured by the test tubecover, protection on the heating
block and safetythermostat.It is possible to set 5 different
working temperatures (70, 100,120, 150 and 160C) and working time
in minutes (30, 60,120 and continuous) with an acoustic signal and
automaticswitching off at the end of cycle.
The heating block made of aluminum offers optimumthermal
homogeneity at all of the selected temperatures.Heating block
temperature is controlled by PID logicmicroprocessor.
8- and 25-position thermoreactorsfor test tube analysis with
pre-settemperatures and times
10 Environment Line
Environment Line
ECO 8 - ECO 25
Technical Data
CM0091680 CA0091636 A00001039
CA0091666 CA0091667 10001146
Instruments Power supply Code No
ECO 8 220 240V / 110 120V/ 50 60 Hz F101A0127
ECO 25 220 240V / 110 120V/ 50 60 Hz F101A0125
Optional Accessories Code No
Set of 20 glass test tubes with internal 14 mm and external 16
mm CM0091680
Holder for 12 round glass cells CA0091636
Test tube extractor A00001039**
* only for ECO 8
** only for ECO 25
Accessories for sludge analysis Code No
Test tube for sample decomposition 22 mm external diameter,
CA0091666*
NS 19/26 cone with glass cap
Condenser 200 mm type KS with 3 meters polyethylene tube
CA0091667*
Absorption attachment for condenser NS 29/32 10001146*
95
155
95
275
135 230
Selectable working temperatures:70, 100, 120, 150 e 160C
Selectable working time: 30, 60, 120 min or continuous
Holes number and diameter: 8 or 25 with ext. 16mmFor ECO 8: 1
hole ext. 22mm (sludge analysis)
Display visualization of the reached temperature andremaining
time
Automatic adjustment of the voltage:230V or 115V
Power ECO 8: 140WPower ECO 25: 400W
Weight ECO 8: 2 kg (4.4 lb)Weight ECO 25: 3,6 kg (7.9 lb)
Dimension (WxHxD) ECO8: 135x95x230 mm
(5.3x3.7x9.1 in)Dimension (WxHxD) ECO25: 155x95x275 mm
(6.1x3.7x10.8 in)
Heating block technical data: Temperature stability: 0,3C
Temperature homogeneity: 0,3C Temperature precision:
0,3COvertemperature safety
Signals:Reaching of set temperature : acoustic and visual
signalCount-down: visual signalEnd of cycle: acoustic and visual
signalProbe interruption: acoustic and visual signalBroken probe:
acoustic and visual signalExceed temperature range: acoustic and
visual signal
