caa a22 4500 605466076 CHVBK 20210128100305.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00769-015-1170-z doi (NATIONALLICENCE)springer-10.1007/s00769-015-1170-z Proficiency testing of wastewater sampling: What did we learn? [Elektronische Daten] [Magda Cotman, Albin Pintar] The proficiency testing of wastewater sampling is organized by the Laboratory for Environmental Sciences and Engineering at the National Institute of Chemistry, Slovenia (NIC). Preliminary tests started in 2010 at two candidate sites to choose for a trial the most convenient one. In 2012, we organized the first collaborative field trial on wastewater sampling and such trials continued in 2013 and 2014. Between 16 and 20 sampling teams were selected from those that (1) participate in the national wastewater monitoring program and (2) perform analytical activities in laboratories. The participants used a 6-h time proportional sampling approach. They used sampling equipment with different principles of sample collection which take a series of discrete samples at fixed time intervals. Subsequent analyses involved both field and laboratory measurements. The participants, with only one exception, exhibited required technical skills for measuring field parameters (temperature and pH value). All samples taken were also analyzed at NIC. The variability between reported values of participants in the trials, expressed as CV, was found to be 8.5 %, 11.1 % and 9.5% for chemical oxygen demand. Of all parameters, the largest variability was found for total organic carbon concentration amounting to 23.7 % and 35.7%. Particular attention was given to separate the measurement uncertainty contributions arising from sampling and chemical analyses. Springer-Verlag Berlin Heidelberg, 2015 Monitoring parameters nationallicence Proficiency testing nationallicence Sampling uncertainty nationallicence Scoring results nationallicence Wastewater sampling nationallicence Cotman Magda Laboratory for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia aut Pintar Albin Laboratory for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia aut Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 387-394 0949-1775 20:5<387 2015 20 769 https://doi.org/10.1007/s00769-015-1170-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00769-015-1170-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cotman Magda Laboratory for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Pintar Albin Laboratory for Environmental Sciences and Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 773 0- Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 387-394 0949-1775 20:5<387 2015 20 769