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PE1575 Supelco

Kjeldahl Nitrogen, Total (TKN) - WS

Proficiency Testing Material

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Properties

Related Categories Additional Standards, Analytical Standards, Analytical/Chromatography, Proficiency Testing, Water Supply/Drinking Water Inorganics,
Quality Level   100
packaging   ampule of 1 × 2 mL
mfr. no.   RTC, PEI-1371
concentration   in H2O
Featured Industry   Environmental

Description

General description

This proficiency testing sample is produced in accordance with ISO/IEC 17043:2010. All information regarding the use of this material can be found in the reporting packet supplied for each sample.

Preparation Note

This PT sample is as a 2 mL concentrate.
The solvent for this sample is water.
The PT sample has been autoclaved for preservation.

Sample preparation
To prepare solution, partially fill a 1000-mL volumetric flask with ammonia-free, reagent-grade water (near 20 degrees C).
Open ampule PE1575-2ML (be careful to avoid cuts on glass) and transfer 1.0 mL of concentrate to the volumetric flask.
Fill the volumetric flask to volume with reagent-grade water and mix well.
The sample is now ready for immediate analysis.
If a solution is not to be analyzed within two days after preparation, preserve a sample aliquot with 0.2 mL of concentrated sulfuric acid per 100 mL of sample (pH<2) and store at 4 degrees C until just before analysis. Analyze the preserved sample as soon as possible within the maximum 28-day holding time.

Other Notes

Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes. Values of analytes vary lot to lot.

Proficiency Testing Schedule (2020-2021)

Drinking Water
WS20-1 January 15 - February 28, 2020
WS20-2 March 25 - May 8, 2020
WS20-3 July 8 - August 21, 2020
WS20-4 September 23 - November 6, 2020

WS21-1 January 13 - February 26, 2021
WS21-3 July 7 - August 20, 2021

Quick-Turn Study - (non-scheduled proficiency test that is available at any time)

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Description

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Kjeldahl nitrogen, total (TKN) 1.5-35 mg/L    
Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
WGK 3
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Protocols & Articles
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