AOX-400 Automatic Organic Halogen Analyzer
Nittoseiko's AOX-400 Automatic Organic Halogen Analyzer measures organic halogen in river water, industrial wastewater, and soil via shaking method, column method, and EOX.
Advanced autosamplers provide flexible combination of different modes easily.
Main Features
- 3-injection mode convertible (shaking method/ column method/ EOX)
- Advanced autosampler concept is space saving and reliable
- Faster measurement time
- Automatic gas flow
- No gases required except air (same as AOX-200)
- Longer lifetime of electrolyte by cell cooling system
- Increase the default number of samples
- Easy maintenance of pyrolysis tube by sliding turntable
Measurement Principal
AOX adsorbed to activated carbon is pyrolyzed in a quartz combustion tube. Combustion gases containing hydrogen halides are forced through a dehydrating tube and subsequently adsorbed within the electrolyte of a coulometric titration cell.
Within the titration cell the halogen ions are quantified by an argentometric coulometry. The amount of chlorine is calculated from the quantity of electricity required for the formation of silver ions.
HCI + Ag+ ➔ H+ + AgCI (Titration)
Ag ➔ Ag+ + e- (Electrolysis)
The gas is moved by application of suction pump.
This principle is used to destroy acetic acid vapour by returning the gases through a separate combustion tube within the furnace after passage of titration celI.
Official Method
- ISO 9562, DIN EN 1485
- Water quality-determination of adsorbable organic halogens {AOX/EOX)
- EPA 9020
- Total organic halides {AOX-Column method)
- ICR [EPA 814-8-96-002 for QC]
- DIN 38414 part 18
- Sludge and Sediment-Determination of adsorbed organically bound halogens {AOX-Shaking method)
Repeatability
(AOX) Confirmation sample: 4-chlorophenol solution
| Concentration (ng/ml) | Sample Volume (ml) | Theoretical Value (µg) | Recovery (%) | RSD (%) n=3 |
| 10 | 100 | 1 | 80 ~ 120 | ≤10 |
| 100 | 20 | 2 | 95 ~ 105 | ≤3 |
(EOX) Confirmation sample: 4-chlorophenol/hexane solution
| Concentration (µg/ml) | Sample Volume (µl) | Theoretical Value (µg) | Recovery (%) | RSD (%) n=5 |
| 5 | 100 | 0.5 | 80 ~ 110 | ≤8 |
| 50 | 40 | 2 | 85 ~ 105 | ≤3 |
Specifications
|
Measuring Object |
River water, Industrial wastewater, Soil |
|
Sample forms |
Solid (AOX: activated carbon adsorbed liquid sample), Liquid (EOX: extraction solution) |
|
Analysis method |
Oxidative pyrolysis/Coulometry |
|
Furnace temperature |
150~ 1000 °C (Regular use: 950° C) |
|
Sample introduction |
Introduction to the open top pyrolysis tube driven by Newton's law AOX: Extrusion injection of activated carbon adsorbed sample (Column method) Drop frit with activated carbon adsorbed sample (Shaking method) EOX: Direct injection by syringe |
|
Measurement range |
Total organic halogen: 0.1 to 50 µ1g |
|
Sample volume |
AOX sample: 50mg or less, EOX sample: 200 µL or less |
|
Measurement time |
Within 10 minutes/measurement (At 2 µg sample measurement) |
|
Number of samples |
Frit: 30 samples Column: 60 samples EOX: 40 samples (Size: 2ml vials with septum) |
|
Gas |
Using AIR-200, Air gas is not required. AOX: Air (800mL/min) EOX: Air (l00mL/min) + Oxygen (300mL/min) |
|
Operation Condition |
15 to 35 °C, 75%RH or less (no condensation) |
|
Power supply |
AC 100/115/230/240V, 50/60Hz, 960VA |
|
Dimensions & Weight |
AOX main unit: Approx. 460(W) x 420(D) x 570H (H) mm, Approx. 37kg Sl-400: Approx. 190(W) x 400(D) x 410H(H) mm, Approx. 7kg AIR-200: Approx. l00(W) x 400(D) x 220H (H) mm, Approx. 5kg |
|
Device control and data processing |
PC, Printer: compatible with Windows® |
