Volatile Halogenated Hydrocarbons

• Two proficiency testing items on different concentration levels
• 600 mL per proficiency testing item
• Natural samples (C75): one surface water, one ground water (partly fortified)
  Details: UBA and Annual Programme 2026
• Synthetic samples (IFA), concentration range: 0 µg/L - 25 µg/L
• In round CB13 there is the possibility to order BTEX/MTBE and VHH together at a reduced price.
• The specified standard deviations for proficiency assessment (z-score-criteria in %) and lower limits apply to synthetic samples in the year 2026 and are calculated from interlaboratory comparisons 2015-2025.
  The standard deviations are recalculated and updated at regular intervals.



Parameter	standard deviation for proficiency assessment based on the assigned value	Lower limit
1,1-Dichloroethene	15 %	0.25 µg/L
Dichloromethane	13 %	0.7 µg/L
trans-1,2-Dichloroethene	14 %	0.15 µg/L
cis-1,2-Dichloroethene	14 %	0.15 µg/L
Trichloromethane	12 %	0.15 µg/L
1,1,1-Trichloroethane	12 %	0.15 µg/L
Tetrachloromethane	14 %	0.15 µg/L
1,2-Dichloroethane	13 %	0.4 µg/L
Trichloroethene	13 %	0.15 µg/L
Bromodichloromethane	11 %	0.15 µg/L
Tetrachloroethene	14 %	0.15 µg/L
Dibromochloromethane	11 %	0.2 µg/L
Tribromomethane	13 %	0.2 µg/L

Proficiency testing round	Registration deadline	Dispatch	Organisation	Proficiency testing item	Closing date
C74	09.02.2026*)	23.02.2026	IFA	synthetic	20.03.2026
C75	07.04.2026*)	21.04.2026	UBA	natural samples	19.05.2026
C-CB13	05.10.2026*)	19.10.2026	IFA	synthetic	20.11.2026


^*) Registration after the registration deadline: on request


• Contact IFA: Caroline Stadlmann, Ing.
  Phone: +43(0) 1 47654 97306
• Contact UBA: Martha Schmid, MSc.
  Phone: +43(0) 1 31304 4334

The proficiency testing rounds VHH and BTEX&MTBE in real water samples (UBA) will be offered in an alternation mode.
In 2026 VHH are offered and a proficiency testing round for BTEX/MTBE in real water samples will take place in 2027.