Water for NP Analyzers

Impact of Water

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. 

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