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<br />Table 12. Summary of differences between environmental and concurrent-replicate samples for nutrients and organic carbon <br /> <br />I Lowest rounding unit is eLjuallO the magnitude oftl1e least siBnificllnt figure] <br /> <br /> Percent of samples Percent of samples Percent of samples <br />Constituent with no difference within plus or minus 1 within plus or minus 2 <br /> lowest rounding unit lowest rounding units <br />Ammonia 86 100 iOO <br />Dissolved ammonia plus organic 86 100 100 <br />Total ammonia plus organic 86 86 86 <br />Nitrite 100 100 100 <br />Nitrite plus nitrate 71 71 86 <br />Dissolved organic carbon 43 57 71 <br />Suspended organic carbon 43 4' 71 <br />Dissolved phosphorus 71 86 86 <br />TOlal phosphorus 29 57 71 <br />Orthophosphate 100 100 100 <br /> <br />Post-Processing Split Replicates <br /> <br />A post-processing split replicate is a <br />processed sample that is poured intI) identical bottles <br />and thus split into two separate samples (split A <br />and split B). Splil A and split Bare submiued to <br />me laboratory for analysis as unique samples. <br />These pairs I)f samples help to evaluate the potential <br /> <br />sources of variability resulting from sample <br />shipping and analysis. Variabilily resuhing from <br />sample collection and processing is not evaluated <br />by post-processing split-replicate sampling. The <br />dislribution of collection of the post-processing <br />split-replicate samples by site and date is shown in <br />figure 4. <br /> <br />24 Interim Reaults of Quality-Control Sampling of Surlace Water for the Upper Colorado River National Water-Quality <br />Assessment Study Unit, Water Years 1995-96 <br />