Nitrite Toxicity

Screen measured nitrite on an explicit NO2-N basis against caller concentration and chloride-ratio criteria; no universal species toxicity limit, diagnosis or salt dosing recommendation.

Description

Nitrite comparisons and chloride protection ratios depend on the reporting basis.

Nitrite comparisons and chloride protection ratios depend on the reporting basis. This tool uses nitrite nitrogen, NO₂-N, rather than the mass of the whole nitrite ion.^[1]

Screen measured nitrite on an explicit NO2-N basis against caller concentration and chloride-ratio criteria; no universal species toxicity limit, diagnosis or salt dosing recommendation.

When to use Nitrite Toxicity

Use this tool to screen measured nitrite on an explicit NO2-N basis against caller concentration and chloride-ratio criteria; no universal species toxicity limit, diagnosis or salt dosing recommendation.

Prepare the cohort, water, feed or equipment measurements for one consistent operating period. Confirm nitrogen reporting bases, dry/wet masses, flow units and supplied design assumptions.

How to use Nitrite Toxicity and understand its results

Prepare the cohort, water, feed or equipment measurements for one consistent operating period. Confirm nitrogen reporting bases, dry/wet masses, flow units and supplied design assumptions.
Enter nitriteNitrogenMgPerLiter, chlorideMgPerLiter, comparisonNitriteNitrogenMgPerLiter, requiredChlorideToNitriteNRatio using the field table and calculation rules, then run the tool.
Read nitriteComparisonRatio, chlorideToNitriteNRatio, chlorideDeficitMgPerLiter, meetsCallerChlorideRatio. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
nitriteNitrogenMgPerLiter	Nitrite nitrogen mg per liter	number	Required
chlorideMgPerLiter	Chloride mg per liter	number	Required
comparisonNitriteNitrogenMgPerLiter	Comparison nitrite nitrogen mg per liter	number	Required
requiredChlorideToNitriteNRatio	Required chloride to nitrite n ratio	number	Required

Supply positive nitrite-N, comparison concentration and required chloride-to-nitrite-N ratio with nonnegative chloride. Return the comparison multiple, actual ratio, chloride deficit mg/L and an inclusive ratio-met flag.

nitriteMultiple=nitriteN/comparisonN; chlorideRatio=chloride/nitriteN; deficit=max(0,requiredRatio×nitriteN−chloride)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
nitriteComparisonRatio	Nitrite comparison ratio	number
chlorideToNitriteNRatio	Chloride to nitrite n ratio	number
chlorideDeficitMgPerLiter	Chloride deficit mg per liter	number
meetsCallerChlorideRatio	Meets caller chloride ratio	boolean

json

{
  "input": {
    "nitriteNitrogenMgPerLiter": 1,
    "chlorideMgPerLiter": 10,
    "comparisonNitriteNitrogenMgPerLiter": 0.5,
    "requiredChlorideToNitriteNRatio": 20
  },
  "output": {
    "nitriteComparisonRatio": 2,
    "chlorideToNitriteNRatio": 10,
    "chlorideDeficitMgPerLiter": 10,
    "meetsCallerChlorideRatio": false
  }
}

Limitations and assumptions

The comparison and ratio are caller criteria, not embedded species safety limits. Molecular nitrite must be converted to the nitrogen basis separately; competing water-quality factors are excluded.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use pH Adjustment: Interpolate a monotone measured titration curve and scale the identical-water/identical-titrant sample dose; no generic pH-to-reagent chemistry, equilibrium guarantee or operational dosing advice. For a complementary task, use Nitrification Rate: Measure net TAN disappearance and active-area-normalized rate across parallel streams; negative net removal is preserved and TAN disappearance alone does not prove nitrification.

References

Nitrite Toxicity — tool.io

Similar or alternative tools

pH Adjustment
Interpolate a monotone measured titration curve and scale the identical-water/identical-titrant sample dose; no generic pH-to-reagent chemistry, equilibrium guarantee or operational dosing advice.
Nitrification Rate
Measure net TAN disappearance and active-area-normalized rate across parallel streams; negative net removal is preserved and TAN disappearance alone does not prove nitrification.