Save Time, Resources and Increase Throughput:
New In-line Ammonia Methods
Method Overview
The in-line distillation methods cover the determination of ammonia in drinking, ground, and surface waters, domestic and industrial wastes, and TKN digests. For these methods, the sample is distilled in-line by mixing it with a borate buffer, adjusting the sample pH and decreasing the hydrolysis of cyanates and organic nitrogen compounds.
The sample is then heated to 120oC and distilled across a hydrophobic semi-permeable membrane into a stream of dilute sulfuric acid. Measurement of the distilled ammonia sample takes place by Flow Injection Analysis, using either a salicylate or phenolate colorimetric method.
Method Support Data
A few examples of support data for the method are given below. For technical inquiries, please contact your Lachat Instruments representative.
Calibration Data for Ammonia (Salicylate Method)
Calibration Graph and Statistics
Method Detection Limit for Ammonia using a 0.125 mg N/L as NH3 standard (Phenolate Method)
MDL= 0.022 mg N/L as NH3, reporting 0.066 mg N/L as NH3 as the MDL due to carry over.
Standard Deviation (s) = 0.0071 mg N/L as NH3, Mean (x) = 0.131 mg N/L as NH3, Known Value = 0.125 mg N/L as NH3
File Name: 7-28 cal support.omn
Acq. Date: 28 July 2008
MDL= 0.022 mg N/L as NH3, reporting 0.066 mg N/L as NH3 as the MDL due to carry over.
Standard Deviation (s) = 0.0071 mg N/L as NH3, Mean (x) = 0.131 mg N/L as NH3, Known Value = 0.125 mg N/L as NH3
File Name: 7-28 cal support.omn
Acq. Date: 28 July 2008
Precision Data for Kjedahl Nitrogen using a 10.0 mg N/L standard
% RSD =0.98
Standard Deviation (s) = 0.103 mg N/L, Mean (x) = 10.58 mg N/L, Known Value = 10.0 mg N/L
File Name: 8-12 CO prec2.omn
Acq. Date: 12 August 2008
% RSD =0.98
Standard Deviation (s) = 0.103 mg N/L, Mean (x) = 10.58 mg N/L, Known Value = 10.0 mg N/L
File Name: 8-12 CO prec2.omn
Acq. Date: 12 August 2008