G/TBT/N/UGA/1645  
1 July 2022  
(22-5115) 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), 
Natural Gas, Gaseous Fuels.  
5. Title, number of pages and language(s) of the notified document:  DUS 2529:2022, 
Standard Test Method for Simultaneous Measurement of Sulfur Compounds and Minor 
Hydrocarbons in Natural Gas and Gaseous Fuels by Gas Chromatograph y and Atomic 
Emission Detection, First Edition; (15 page(s), in English)  
6. Description of content:  This Draft Uganda Standard is for the determination of volatile 
sulfur -containing compounds and minor hydrocarbons in gaseous fuels including 
components wi th higher molar mass than that of propane in a high methane gas, by gas 
chromatography (GC) and atomic emission detection (AED). Hydrocarbons include 
individual aliphatic components from C4 to C6, aromatic components and groups of 
hydrocarbons classified a ccording to carbon numbers up to C12 at least, such as C6 -C7, 
C7-C8, C8 -C9 and C9 -C 10, etc. The detection range for sulfur and carbon containing 
compounds is approximately 20 to 100  000 picograms (pg). This is roughly equivalent to 
0.04 to 200 mg/m3 sulfu r or carbon based upon the analysis of a 0.25 mL sample.  
This test method describes a GC -AED method employing a specific capillary GC column 
as an illustration for natural gas and other gaseous fuel containing low percentages of 
ethane and propane. Alternative GC columns and instrument parameters may be used in 
this analysis optimized for different types of gaseous fuel, provided that appropriate 
separation of the compounds of interest can be achieved.  G/TBT/N/UGA/1645  
 
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  This test method does not intend to identify all individual sulfur species. Unknown sulfur 
compounds are measured as mono -sulfur containing compounds. Total sulfur content of 
a sample can be found by summing up sulfur content present in all sulfur species.  
This method is not a Detailed Hydro carbon Analysis (DHA) method and does not intend 
to identify all individual hydrocarbon species. Aliphatic hydrocarbon components lighter 
than n -hexane, benzene, toluene, ethyl benzene, m,p -xylenes and o -xylene (BTEX) are 
generally separated and identified  individually. Higher molar mass hydrocarbons are 
determined as groups based on carbon number, excluding BTEX. The total carbon content 
of propane and higher molar mass components in a sample can be found by summing up 
carbon content present in all species  containing carbon.  
7. Objective and rationale, including the nature of urgent problems where 
applicable:  Prevention of deceptive practices and consumer protection; Quality 
requirements  
8. Relevant documents:   
1. ASTM D1945 Test Method for Analysis of Natural Gas by Gas Chromatography  
2. ASTM D1946 Practice for Analysis of Reformed Gas by Gas Chromatography  
3. ASTM D3609 Practice for Calibration Techniques Using Permeation Tubes  
4. ASTM D4626 Practice for Calculation of Gas Chromatographic Response Factors  
5. ASTM D5287 Practice for Automatic Sampling of Gaseous Fuels  
6. ASTM D5504 Test Method for Determination of Sulfur Compounds in Natural Gas 
and Gaseous Fuels by Gas Chromatography and Chemiluminescence  
7. ASTM D5623 Test Method for Sulfur Compounds in Light Petroleum Liquids by 
Gas Chromatography and Sulfur Selective Detection  
8. ASTM D6228 Test Method for Determination of Sulfur Compounds in Natural Gas 
and Gaseous Fuels by Gas Chromatography and Flame Photometric Detection  
9. ISO 19739 Natural Gas —Determination of Sulfur C ompounds by Gas 
chromatography3  
10. GPA 2199 Determination —Specific Sulfur Compounds4  
11. "Improved Measurement of Sulfur and Nitrogen Compounds in Refinery Liquids 
Using Gas Chromatography —Atomic Emission Detection," Journal of 
Chromatographic Science, 36, No 9, September, 1998, p. 435.  
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