Can the Wastewater Influent Inorganics Quality Control Standard be used to check the accuracy of the s-TKN™ method 10242 or the TN method 10208?

Document ID

Document ID TE3219

Published Date

Published Date 06/03/2018
Question
Can the Wastewater Influent Inorganics Quality Control Standard be used to check the accuracy of the s-TKN™ method 10242 or the TN method 10208?
Summary
Using Wastewater Influent Inorganics Quality Control Standard with the s-TKN™ or TN methods.
Answer
The Wastewater Influent Inorganics Quality Control Standard Solution (Catalog Number/Order Code 2833149) should not be used in the simplified Total Kjeldahl Nitrogen (s-TKN™) or Total Nitrogen (TN) methods. The standard contains sulfanilic acid as an additional component which will increase the total nitrogen value by 31.3 mg/L as N. This addition will raise the standard TN value outside of the range for these tests.

For the s-TKN™ method 10242, the Wastewater Effluent Standard Solution (Catalog Number/ Order code 2833249) can be used as described in the method.

For TN methods, an ammonia standard solution can be used for accuracy checks as described in the method. Nitrate standard solutions can also be used in a similar fashion.

Can the Wastewater Effluent Inorganics Quality Control Standard be used with TNT826?