TAN: Total Ammonia Nitrogen (TAN) using Indophenol Method

In AquaAnalytix: Water Quality Analysis

Total Ammonia Nitrogen (TAN) using Indophenol Method

Description

Total ammonia nitrogen (TAN) is a measure of the total amount of ammonia nitrogen present in a sample, including both ammonium ion and ammonia gas. Ammonia exists in two forms in water: ionized and unionized. The primary difference between ionized and unionized ammonia is their chemical state, which can affect their behavior and toxicity. Only a fraction of the TAN exists as toxic (un-ionized) ammonia, and a balance exists between it and the nontoxic ionized ammonia based on pH and temperature.Unionized ammonia is more toxic to aquatic life than ionized ammonia.

Principle of analysis:

Water sample is treated in an alkaline citrate medium with sodium hypochlorite and phenol in the presence of sodium nitroprusside which acts as a catalyzer and colour intensifier. The blue indophenol colour formed with ammonia is measured spectrophotometrically at 640nm. APHA(2017,ISBN:9780875532875).

Usage

TAN(Conc_std_sol, A_s, A_b, A_st)

Arguments

Conc_std_sol	Concentration of standard solution
A_s	Mean absorbance of samples
A_b	Mean absorbance of blanks
A_st	Mean absorbance of standards

Value

Total Ammonia Nitrogen (TAN) (in micro gm/L)

References

APHA, 2017. Standard methods for examination of water and wastewater, 23rd edn. APHA, AWWA, WPCF, Washington

Examples

TAN(1000, 0.17, 0.1, 0.8)

AquaAnalytix documentation built on Sept. 11, 2024, 6:17 p.m.