AQS Baden-Württemberg - Details
Details of the proficiency test
- Priority pesticides in surface water“ – (June 2012)
Parameter
 Aclonifen
 Alachlor
 Atrazine
 Bifenox
 Chlorfenvinphos
 Chlorpyrifos (Chlorpyrifos-Ethyl)
 Cybutryne
 Diuron
 Isoproturon
 Quinoxyfen
 Simazine
 Terbutryn.
 Trifluralin
Matrix
Surface water
Aim of the PT
To check the chemical analysis of priority and other substances in the context of chemical
monitoring for the European Water Framework Directive, especially for compliance of surface
waters with Environmental Quality Standards (EQS):
Parameter
Aclonifen
Alachlor
Atrazine
Bifenox
Chlorfenvinphos
Chlorpyrifos (Chlorpyrifos-Ethyl)
Cybutryne
Diuron
Isoproturon
Quinoxyfen
Simazine
Terbutryn
Trifluralin
(proposed) AA-EQS [ng/l]
(120)
300
600
(12)
100
30
(2,5)
200
300
(150)
1000
(65)
30
AA: Annual average
Dates and deadlines
 Application deadline: 17. August 2012
Please apply for this PT preferably via our website (http://www.aqsbw.de) or with the
enclosed registration form.


Dispatch of the samples: 09. October 2012
Deadline for submission of results: 29. October 2012, 24:00h
in written form to the provider
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AQS Baden-Württemberg - Details
Sample dispatch
Samples will be sent by courier service. Participants may also choose to pick up the samples
at the provider.
Sample details
3 different surface water test samples at three levels of concentration of the analytes will be
distributed in 1000 ml glass bottles, screw capped with PTFE sealing. Two bottles of each
sample will be distributed for duplicate measurement. Sample preservation by cooling.
Permitted analytical methods
Participants are free to choose a suitable method.
Limit of quantification
The analytical method must achieve the following limits of quantification (LOQ):
Parameter
Aclonifen
Alachlor
Atrazine
Bifenox
Chlorfenvinphos
Chlorpyrifos (Chlorpyrifos-Ethyl)
Cybutryne
Diuron
Isoproturon
Quinoxyfen
Simazine
Terbutryn
Trifluralin
Limit of quantification [ng/l]
25
25
25
3,75
25
9
5
25
25
25
25
10
5
These values are fixed taking into account the requirements of article 4 of the commission
directive 2009/90/EC of the European communities for the technical specifications for
chemical analysis and monitoring of water status in the context of the water framework
directive (30 % of the relevant EQS) and the analytical possibilities. For some parameters the
LOQ values required by the EU directive are unrealistically low, in other cases the values
would be too high.
Execution of the analysis
The samples must be analysed in the own laboratory with own personnel and own
equipment. Subcontracting of the analysis is not allowed.
Evaluation
The statistical evaluation of the PT is carried out preferably using reference values from the
sample formulation as assigned values X. If this is not possible, the consensus mean of
participants’ data (calculated with Algorithm A mean according to ISO 13528 -Annex C) will
be used.
The standard deviation for proficiency assessment (SDPA) is calculated in compliance with
the requirements of the “PT-WFD”- network: SDPA = 0,25 · X.
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AQS Baden-Württemberg - Details
Assessment
For each measured value x, a z-score is calculated from the assigned value X and SDPA
according to following formula:
z
x  X 
SDPA
The assessment of the results is as follows:
|z|  2,0
2,0 < |z| < 3,0
|z|  3,0
satisfactory
questionable
unsatisfactory
Certificate
For each parameter it will be stated, how many values are satisfactory, questionable or
unsatisfactory.
The results reported as below (<) limit of quantification will be assessed as “unsatisfactory”.
Reporting
There will be a final report provided by AQS-BW in English language.
Participation fee
The participation fee will be 500 € plus transport costs:
- within Germany: about 20 €
- to neighbouring European countries: presumably about 160 €
- in other European countries: presumably about 180 €
VAT might also be added, if applicable
For transportation costs to participants outside Europe, please contact us.
Of course there are no transportation costs, if samples are picked up at the provider.
Cooperation partners
This PT is accomplished in cooperation with the following organisations of the “PT-WFD”network:
 Kemijski inštitut Ljubljana 1001 Ljubljana, Hajdrihova 19, p.p.660, SLOVENIA, Tel.:
+386 1 476 02 00, Fax: +386 1 476 03 00, mail: info@ki.si
 QualityConsult, Via G. Bettolo 4, (00195) Rome, ITALY, Tel.: +39 320-6905464, Fax:
+39 0697840718, qualityconsult@aqc.it
 Proftest SYKE, Finnish Environment Institute (SYKE), Hakuninmaantie 6, 00430
Helsinki, FINLAND, Tel.: +358 20 610 123, Fax: +358 9 448 320,
proftest@environment.fi
 VITUKI Nonprofit Ltd., Quality Assurance and Control, 1095 Budapest, Kvassay J. 1.,
HUNGARY, Tel: +36 1 215-6140/ext. 2199, Fax: +36 1 215-6046, mecs@vituki.hu
Participants may apply at the central organizer and any of the mentioned cooperation
partners.
If you apply at one of the cooperation partners, your identity will be kept confidential also to
the central organizer.
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