G/TBT/N/UGA/1650  
1 July 2022  
(22-5124) Page: 1/2 
Committee on Technical Barriers to Trade  Original:  English  
 
  
NOTIFICATION  
The following notification is being circulated in accordance with Article 10.6  
 
1. Notifying Member:  UGANDA  
If applicable, name of local government involved (Article 3.2 and 7.2):   
2. Agency responsible:   
Uganda National Bureau of Standards  
Plot 2 -12 ByPass Link, Bweyogerere Industrial and Business Park  
P.O. Box 6329  
Kampala, Uganda  
Tel: +(256) 4 1733 3250/1/2  
Fax: +(256) 4 1428 6123  
E-mail: info@unbs.go.ug  
Website: https://www.unbs.go.ug  
Name and address (including telephone and fax numbers , email and website 
addresses, if available) of agency or authority designated to handle comments 
regarding the notification shall be indicated if different from above:   
3. Notified under Article 2.9.2 [  ], 2.10.1 [  ], 5.6.2 [X], 5.7.1 [  ], 3.2 [  ], 7.2 [  ], 
other :  
4. Products covered (HS or CCCN where applicable, otherwise national tariff 
heading. ICS numbers may be provided in addition, where applicable):  Petroleum 
gases and other gaseous hydrocarbons. (HS code(s): 2711); Fuels (ICS code(s): 75.160), 
Gaseous Mixtures  
5. Title, number of pages and language(s) of the notified document:  DUS 
2524:2022, Standard Test Method for Determination of Hydrocarbons and Non -
Hydrocarbon Gases in Gaseous Mixtures by Gas Chromatography, First Edition ; 
(21 page(s), in En glish)  
6. Description of content:  This Draft Uganda Standard is intended to quantitatively 
determine the non -condensed hydrocarbon gases with carbon numbers from C1 to C5+ 
and non -hydrocarbon gases, such as H2, CO2, O2, N2, and CO, in gaseous samples. Thi s 
test method is a companion standard test method to Test Method ASTM D1945 and 
Practice ASTM D1946, differing in that it incorporates use of capillary columns instead of 
packed columns and allows other technological differences.  
Hydrogen sulfide can be detected but may not be accurately determined by this procedure 
due to loss in sample containers or sample lines and possible reactions unless special 
precautions are taken.  
Non-hydrocarbon gases have a lower detection limit in the concentration range of 0 .03 to 
100 mole percent using a thermal conductivity detector (TCD), and C1 to C6 hydrocarbons 
have a lower detection limit in the range of 0.005 to 100 mole percent using a flame 
ionization detector (FID); using a TCD may increase the lower detection limi t to 
approximately 0.03 mole percent.  G/TBT/N/UGA/1650  
 
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  Hydrocarbon detection limits can be reduced with the use of pre -concentration techniques 
or cryogenic trapping, or both. This test method does not fully determine individual 
hydrocarbons heavier than benzene, which are grouped together as C7+. When detailed 
analysis is not required, the compounds with carbon number greater than C5 may be 
grouped as either C6+ or C7+. Accurate analysis of C5+ components depends on proper 
vaporization of these compounds during sa mpling at process unit sources as well as in 
the sample introduction into the analyzer in the laboratory. Water vapor may interfere 
with the C6+ analysis if a TCD detector is used. Helium and argon may interfere with the 
determination of hydrogen and oxyge n respectively. Depending on the analyzer used, 
pentenes, if present, may either be separated or grouped with the C6+ components.  
7. Objective and rationale, including the nature of urgent problems where 
applicable:  Prevention of deceptive practices and c onsumer protection; Quality 
requirements  
8. Relevant documents:   
1. ASTM D1945  
2. ASTM D1946  
3. ASTM D3588  
4. ASTM E355  
5. ASTM E1510  
6. ASTM F307  
7. ASTM DS 4B, 1991 Physical Constants of Hydrocarbon and Non -Hydrocarbon 
Compounds  
8. API MPMS 14.1 Manual of Petroleum Measurement Standards Chapter 14 -Natural 
Gas Fluids Measurement Section 1 -Collecting and Handling of Natural Gas 
Samples for Custody Transfer  
9. Proposed date of adoption:  To be determined  
Proposed date of entry into force:  Not applicable.  
10. Final date for comments:  60 days from notification  
11. Texts available from:  National enquiry point [X] or address, telephone and fax 
numbers and email and website addresses, if available , of other body:   
Uganda National Bureau of Standards  
Plot 2 -12 ByPass Link, Bweyogerere Industrial and Business Park  
P.O. Box 6329  
Kampala, Uganda  
Tel: +(256) 4 1733 3250/1/2  
Fax: +(256) 4 1428 6123  
E-mail: info@unbs.go.ug  
Website: https://www.unbs.go.ug