The process of nitrification is highly dependent on the wastewater's temperature.
Slows and ceases
Water temperatures below 12°C inhibit the oxidation of ammonium to nitrite and also nitrite to nitrate. This can result in, higher effluent values for ammonium or even worse because of its toxicity, dangerous levels of nitirite.
There is a risk that you may miss this change in your effluent values if you keep using a low-range photometric test based on the indophenol blue reaction. This is because substantial exceedance of the measuring range leads to a bluish tinge of the cuvette that the photometer detects as "within measuring range".
Read on to find out how to avoid walking into this trap!
There are several approaches to the issue:
Use an online ammonium monitor in parallel to your lab measurements. Significantly higher measuring results may be an early warning signal.
Check the plausibility of your lab results by using a spiking solution on a regular basis.
Switch to a higher measuring range for your ammonium lab test.
If your photometer is a DR 2800, 3800, 3900, 5000 or 6000, there is a special application available for you. You can still use the low measuring range as usual. The photometer will automatically check the extinction on other wavelengths and give you an alarm message when the measuring range is exceeded.
HACH LANGE solutions deliver a perfectly coordinated system; in lab and in the field.
Photometric cuvette tests for all N parameters
NH4, NO2, NO3, Total N:
Always several measuring ranges to choose from to fit your application.
Safe - Maximum safety for users, thanks to the closed cuvette system and low amounts of reagents. Complete labelling of the individual cuvettes, including barcode label for automatic recognition in the photometer.
Easy - Convenient and error-free dosing of the reagents without pipetting and reagent contact, thanks to DOSICAP and DOSICAP ZIP: cuvette caps containing an exactly pre-dispensed amount of freeze-dried reagent.
Approved - HACH LANGE cuvette tests are officially approved for legally required consent limits. With the help of standard solutions and round-robin test solutions, they provide the assurance you need.
Versatile - 50 parameters and more than 100 measuring ranges for all applications in water analysis.
AN-ISE sc: Combination sensor for ammonium and nitrate Carries out continuously direct measurements using an ion-selective electrode. No need for reagents or sample preparation. Compensated interference by potassium and chloride.
The comprehensive ADDISTA AQA system contains a standard solution plus tow round robin solutions which allow the user to participate in analysis checking free of charge. Lot number, expirey date, and target values by parameter are delivered via RFID tag on the packaging.
Buy 2 boxes of ADDISTA LCA700, LCA703, LCA704 or LCA705 and receive a third box for free!
Orders must be placed by March 31st 2014. Offer Code H2O1409-L must be mentioned at time of purchase. Not to be combined with any other offers or discounts.