RESULTS FROM THE 8TH CIRCUIT INTERLABORATORY FOR DIOXINS (CIND)
The Circuit INter-laboratory for Dioxins (CIND) represents an important opportunity for laboratories for inter-comparing their analytical performances in measuring dioxins. In the 8th CIND edition two samples were sent to laboratories and analyses for PCDD/F, PCBs dioxin-like and PAHs were requested in three replicates. The two samples consisted in environmental matrix from the Lagoon of Venice (sediment) and in fly ash obtained from a municipal crematory. Among the 55 laboratories invited to participate to this CIND edition 48 provided results within the set deadline, for a total of 3618 and 3604 valid data for sediment and fly ash samples, respectively. For detecting extremes and outliers in data provided by laboratories a method based on nonparametric statistics (median and quartiles) was implemented. Such method showed to be more efficient than methods based on parametric statistics, and allowed to robustly and efficiently detect extreme and outlier values in one single run. Data eliminated by these values were used to calculate indicators of precision (z-scores) and accuracy (r-scores) thanks to the availability of analyses in three replicates providing meaningful insights.
Raccanelli Stefano Libralato Simone
Consorzio I.N.C.A.,VEGA-Edificio Cygnus,Via delle Industrie 21/8,30175 Marghera (VE),Italy Istituto Nazionale di Oceanografia e di Geofisica Sperimentale,Borgo Grotta Gigante 42/c,34010,Sgoni
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）