What chlorine method is recommended for ultra low range (ULR) samples (less than 0.05 mg/L chlorine)?

Document ID

Document ID TE196

Version

Version 4.0

Status

Status Published

Published Date

Published Date 01/25/2018
Question
What chlorine method is recommended for ultra low range (ULR) samples (less than 0.05 mg/L chlorine)?
Summary
Ultra Low Range Chlorine
Answer
Hach offers two laboratory methods that can measure ultra-low range (ULR) chlorine concentrations:

Amperometric Titration - the TitraLab®AT1000, can be used to measure as low as 3 µg/L.
ULR DPD Chlorine - a spectrophotometer such as the DR1900, 3900 or 6000 can be used to conduct DPD Ultra Low Range method 10014 (wastewater) or method 8370 (drinking water) which can measure as low as 2 µg/L. These methods use a pour-thru cell, filter and liquid reagents.

A simple test kit for ULR chlorine is not available.

Methods 10014 and 8370 can be found at hach.com/WAH.

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