Question
How is a Lachat Cadmium Column for Nitrate determination checked for efficiency?
Summary
Procedure to check cadmium column efficiency
Answer
Column, Cadmium, for Nitrate determination
(Catalog Number/Order Code 50237A)
Column Efficiency
Before running samples, column efficiency can be determined as follows:
1. Calibrate with nitrate (NO 3 ) standards.
2. Run a known concentration of nitrite (NO 2 ) standard as N.
3. Run a matching concentration of NO 3 standard as N.
The column efficiency is determined by the equation:
where:
E = column efficiency
[NO 3 ] = concentration of nitrate standard
[NO 2 ] = concentration of nitrite standard
If the efficiency is less than 90%, do not use the cadmium column. Contact Lachat
technical support or the local distributor.
Column Efficiency
Before running samples, column efficiency can be determined as follows:
1. Calibrate with nitrate (NO 3 ) standards.
2. Run a known concentration of nitrite (NO 2 ) standard as N.
3. Run a matching concentration of NO 3 standard as N.
The column efficiency is determined by the equation:
where:
E = column efficiency
[NO 3 ] = concentration of nitrate standard
[NO 2 ] = concentration of nitrite standard
If the efficiency is less than 90%, do not use the cadmium column. Contact Lachat
technical support or the local distributor.