Any information on EnviroLyzer series II from Applitek

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I am doing some research on various online wet chemistry analyzers to determine the nitrate concentration in the drinking water. I came across a product line called EnviroLyzer series II. I was not able to find any information about what process does this instrument used, or what is the theory of operation behind this instrument. Does this instrument use one of the two known methods, cadmium reduction, hydrazine reduction, or something else? Is there anyone who has one in their plant? If so, could you provide me with some information that I could share with others? Thanks.

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3 Answers

  1.   I have also been looking for something as an alternative to my disastrous experiences with on-line ISE electrodes.  Take a look at https://www.ott.com/product-guide-ott-econ-low-maintenance-uv-nitrate-in-situ-sensor/  and  https://realtechwater.com/products/uv-vis-sensors/nl-series/  which use UV absorbtion measurement for readings.  I like the idea of low maintenance and no calibration. 

  2. I use NO3 strip of Merck since I was study M.Sc. the accuracy is ok and less toxic waste including safe for the researcher...to monitoring by using Cd reduction. Hach product had been used as well to find out the concentration of NO3 and other heavy metal..N P K..in one equipment. But for me I use Merck product because I use for my thesis and this monitoring have been used widely. For color or sprectrum yes I think both of them the same. If you want to monitoring NO3 ranging 0.5 -50 mg/l Merck is better but you should try on Hach as well to know technology innovation for scientific products. AGGIE BKK Thailand

  3. Applitek has been acquired by Hach and these analyzers are now marketed as EZ Analyzers.  The method for the EZ7700 Total Nitrogen analyzer utilizes a colorimetric measurement at 546 nm using hydrazine reduction and NEDD colour solution after persulphate digestion in alkaline medium, conforming with APHA 4500-N,  Additional information can be found at www.hach.com or through your local Hach representative.