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Water for NP Analyzers

 
 
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Impact of Water


Nitrogen and phosphorus analyzers use water to prepare samples and standards, blanks, and for rinses.

For more information on the impact of water on Kjeldahl analysis, please visit the section dedicated to this topic.

Water Quality Parameters

  • Ammonia, ammonium and nitrogen-containing organics: Molecules containing nitrogen (organic and inorganic) may interfere with nitrogen analysis, and lead to erroneously high results. All nitrogen-containing compounds should be kept to a minimum.
  • Water should also be free of nitrates and nitrites, since the presence of these ions will give artificially high nitrogen concentration.
  • Arsenate interefers with phosphorus analysis because it reacts with the molybdate reagent in a similar manner to that of phosphate.
  • High levels of silica also interferes with phosphorus analysis; it forms a similar complex with molybdenum as phosphate does, and cause an overestimation of phosphorus.
  • Water should be free of phosphates and phosphorus-containing compounds that could give artificially high phosphorus levels.
  • Bacteria levels should be kept to a minimum, as they may form biofilms that could contaminate the analyzer, leading to additional maintenance. In addition, bacteria release by-products that may interfere with the analysis. 
Pure or ultrapure water delivered with a 0.2 µm screen filter as final filter is recommended for nitrogen and phosphorus analyzers.


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