Is distillation of the sample necessary when following an ammonia method?

Document ID

Document ID TE142

Published Date

Published Date 25/01/2018
Question
Is distillation of the sample necessary when following an ammonia method?
Summary
Nitrogen-ammonia distillation recommendations
Answer
Each nitrogen-ammonia method list potential interfering substances in the interference section. The process of distillation eliminates the interferences from the sample. The United States Environmental Protection Agency (USEPA) requires distillation for wastewater reporting.

Distillation may be necessary for seawater samples using the Nitrogen-Ammonia Nessler Method 8038 (find the method here). Method 8038 states high chloride concentrated samples have reduced sensitivity by 30%. For best results, perform a calibration, using standards spiked to the same chloride concentration or distill the sample.

For Nitrogen Ammonia distillation instructions reference, Distillation Apparatus User Manual Catalog Number 2265308.