What is the shelf life for Lachat reagents/standards?

Document ID

Document ID TE7994

Version

Version 3.0

Status

Status Published

Published Date

Published Date 05/21/2019
Question
What is the shelf life for Lachat reagents/standards?
Summary
Lachat reagent and standard shelf life
Answer
Many Lachat methods will specify this within the preparation instructions. When they are not specified, one can consider the following general guidelines:
  • Organic chemical dissolved in water: 1 day
  • Inorganic salt in water (KCl, NaOH, CuSO4): 1 month
  • Inorganic salts containing nutrients (KNO3, (NH4)2SO4): 2 days
  • Stock Standards (>1 ppm): 1 week
  • Working Standards (<1 ppm): 1 day

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