Draft concept to assess quality of monitoring database

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Presentation transcript:

Draft concept to assess quality of monitoring database Agenda Item 7.2 : Draft concept to assess quality of monitoring database …from current situation to recommendations for the future B.FRIBOURG-BLANC, IOW (b.fribourg-blanc@oieau.fr)

Context and Objective The monitoring-based ranking uses a big database: 14.5 million analyses on 1151 substances 4 Waterbody types 20 000 stations 28 countries The quality of the provided data = responsibility of data provider The assessment of analytical data quality is a difficult task BUT: A learning by doing process A need to steer future improvements  a country specific approach

The approach Assessment of the data at three levels: 1. Quality of reporting 2. Quality of analyses 3. Quality by substance Presentation of the results by country and at the complete database level Short assessment + more detailed annexes

quality of reporting: overall A commonly defined template A software tool used by most data providers A relatively low level of completeness (Q1 is lowest, Q6 highest): Analyses with the lowest score BUT samplings and stations higher AND significant quantity of stations with scores 4 and 5

quality of reporting: the stations - Uneven geographical distribution - Some location errors: 2433 with wrong RBD of which 1159 not in the reporting country - Uneven waterbody type distribution

quality of reporting: the analyses Uneven waterbody type distribution Uneven matrix distribution Uneven temporal distribution

quality of analyses -Quality information reported

quality of analyses -Analytical information reported

quality of analyses -Analytical method reported -Plausibility

quality by substance: Directive 2008/105/EC performance criteria set in Directive 2009/90/EC: LoQ < 0,3 x EQS Some substances with many analyses where no LoQ (red) Some substances with many analyses where to high LoQ (red) Some substances with significant part already complying

quality by substance: Directive 2008/105/EC performance criteria set in Directive 2009/90/EC: LoQ < 0,3 x EQS

quality by substance: LoQ distribution (all data, by fraction) LoQ value reflects the analytical method used Wide distributions, from minimum to maximum found in the datasets All substances ranking high or very high A selection of substances of EU wide relevance

quality by substance: LoQ distribution (cyanides) Summary statistics

quality by substance: LoQ distribution (cyanides) Sediment <2mm Whole water

quality by substance: LoQ distribution (Pentachlorophenol) Summary statistics

quality by substance: LoQ distribution by country Wide distribution (up to 10e11) All substances monitored in >11 countries 28 countries, percentage of their analyses in the class 5 classes 8 classes

quality by substance: LoQ distribution by country One example of metal (copper) One example of organic substance, (1,2,4-Trichlorobenzene)

Main conclusions Future data collection will require: additional collection rules (mandatory fields, checks…) more quality information (LoD and LoQ, accreditation…) Use of WISE and INSPIRE reference lists Data providers are invited to have a thorough look at the report (end March) to: Improve their analytical methods Improve their data management With in view future monitoring based ranking

Thanks for your attention…