Product category:
Titration equipment
News Release from: Metrohm UK | Subject: ADI 2040
Edited by the Laboratorytalk Editorial
Team on 29 November 2006
COD by the standard method and UV
absorbance
Law enforcement on compliance with environmental legislation demands COD levels to be within specification, and accurately chemically analysed: the fines can be horrendous, and don't serve any purpose
The accurate and true value of COD to both, law enforcing bodies and 'polluters' is of vital importance from the perspective of control and avoiding fines Hence the requirement, for having analysis done frequently, and for the potential polluting party also quickly, in order to stay in close touch with the water quality and treatment process
This article was originally published on Laboratorytalk on 13 Dec 2006 at 8.00am (UK)
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On-line titration process analysis
These analysers produce a continuous stream of accurate and precise results providing operators with a real-time insight into the chemical environs of their manufacturing process
Process analyser in stainless steel
ADI 2040 process analyser from Applikon Analytical is the most versatile on line analyser available and is available in a stainless steel housing for installation in areas where hygiene is critical
The problem however, using the normalised and widely accepted method is, that it takes two hours to run the analysis and it releases a nasty waste (chromium).
Attempts have been made to solve these problems, eg, analysers using OH radicals, either generated by an electrode or by ozone; these did produce quick results but were very unreliable because the vast majority of organic matter can not be oxydised within the short life time of the OH radicals.
Another option was to use UV spectrophotometry by the normalised method DIN 38404.
Although basically suitable in many cases, the correlation between the UV and the standard method is not general, since each component has its own absorption characteristics.
Only for individual processes one can obtain correlation, based on experience.
The answer is to have an analytical system which utilises a quick test and verifies itself against the standard (DIN 38409- 44, EPA 410.4).
This is a realistic option with the Applikon process analyser ADI 2040, which mimics the COD (Cr) test.
It delivers its results at regular time intervals or upon if-command, based on readings from its attached UV spectrophotometer.
The 2040 offers the best of both worlds: continuously in touch by the UV photometer, backed by the standard test, but run only when off-limit.
Thus minimising reagent usage.
Besides its main duty to provide reliable results, the ADI 2040 may also compensate for chloride when present, thus omit- ting the need for masking agent (mercury).
On top of that, the ADI 2040 has room enough for other analyses and an automatic calibration.
In this way, just one 2040 will be the dependable basis for many of your environmental analyses. Request a free brochure from Metrohm UK ...
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