24 



Safety and SaskPower. 



Sets of triplicate samples were split from USGS sampling churns and submitted to the 

 respective agency laboratories for analyses. Field procedures were identical to those 

 used since 1986. 



Most parameters showed good reproducibility. Results for total Kjeldahl nitrogen, 

 dissolved iron and total molybdenum are not comparable. For total phosphoms, TDS and 

 total chromium, one set of results is noticeably high compared to the other reported sets. 

 Similarly, one of the reported data sets is low for silica and dissolved aluminum. The 

 results reported by one agency for magnesium showed unacceptable variability. The 

 USGS and Saskatchewan Environment and Public Safety's relatively high detection limits 

 for nitrate/nitrite make it difficult to evaluate the results for these parameters. 



Environment Canada has completed a detailed evaluation of all of the available data from 

 past quality control exercises. 



