9409

• UCREFRP Catalog Number: 9409
• Author: Spahr, N. E. and R. W. Boulger.
• Title: Interim Results of Quality-Control Sampling of Surface Water for the Upper Colorado River national Water-Quality Assessment Study Unit, Water Years 1995-96.
• USFW Year: 1997.
• USFW - Doc Type: 97-4227,
• Copyright Material: NO

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Table 11. Comparison of environmental and concurrent- and sequential-replicate samples for nutrients and organic carbon-Continued
[Env., environmental sample; Rep., replicate sample; Diff. I, difference in units of constituent; Diff. 2, difference in lowest rounding unit; mg/L, milligrams per liter; <, value is
less than the laboratory
minimum reporting level; shaded cells represent differences greater than plus or minus I lowest rounding unit; lowest rounding unit is equal to the magnitude of the least significant
figure]
Nitrite Nitrite plus nitrate Dissolved organic carbon Suspended organic carbon
Station Date Env. Rep. Ditt.1 Env. Rep. Ditt.1 Env. Rep. Ditt.1 Env. Rep. Ditt.1
(mg/L) (mg/L) (mg/L) Ditt.2 (mg/L) (mg/L) (mg/L) Ditt.2 (mglL) (mg/L) (mg/L) Ditt.2 (mglL) (mg/L) (mg/L) Ditt.2
Concurrent replicates
State Line 091096 0.02 0.02 0 0
Cameo 051396 <0.01 <0.01 0 0
Gunnison at 32 Road 071895 <0.01 <0.01 0 0
East 113095 <0.01 <0.01 0 0
East 051696 <0.01 <0.01 0 0
Gore 082396 <0.01 <0.01 0 0 0.48 0.48 0 0 1.1 1.1 0 0 0.2 0.2 0 0
Baker 081895 <0.01 <0.01 0 0 <0.05 <0.05 0 0 1.5 1.5 0 0 0.1 0.1 0 0
Maximum difference 0 0 -0.3 -3 -0.6 -6 1.6 16
Percent of samples with 100 100 71 71 43 43 43 43
no difference
Percent of samples 100 71 57 43
within plus or minus 1
lowest rounding unit
Sequential replicates
Dotsero 032096 <0.01 <0.01 0 0 0.13 0.12 0.01 1 0.7 0.7 0 0
Reed 112295 0.05 0.05 0 0 8.3 8.3 0 0 4.8 4.7 0.1 1 0.4 0.4 0 0
Baker 022796 <0.01 <0.01 0 0 0.11 0.10 0.01 1 1.0 1.1 -0.1 -1
Maximum difference 0 0 0.01 1 0.3 3
Number of samples with 3 3 1 1 0 0 2
no difference
Number of samples 3 3 2 2
within plus or minus 1
lowest rounding unit