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

Table 6. Comparisons of environmental and pre-processing split-replicate samples for nutrients and organic carbon-Continued

[Env., environmental sample; Split, pre-processing split-replicate sample; Diff. I, difference in units of constituent; Diff. 2, difference in lowest rounding unit; mg/L, milligrams
per liter; shaded cells
represent differences greater than plus or minus I lowest rounding unit; lowest rounding unit is equal to magnitude of the least significant figure; <, value is less than the laboratory
minimum reporting
level]

Dissolved phosphorus

Station

Date

Ditt.1
(mglL)

Env.
(mglL)

Split
(mglL)

Ditt.2

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Gunnison near 090596
Grand Junction
Gore 102495 0.03 0.03 0 0
Uncompahgre 072596 <0.01 <0.01 0 0
French 090996 <0.01 <0.01 0 0
Dry 082996 0.02 0.02 0 0
Dry Fork 071596 <0.01 <0.01 0 0
Baker 071696 <0.01 <0.01 0 0
Maximum difference 0.035 3.5
Percent of samples with 86 86
no difference
Percent of samples 86
within plus or minus 1
lowest rounding unit

Total phosphorus Orthophosphate
Env. Split Ditt.1 Ditt.2 Env. Split Ditt.1 Ditt.2
(mglL) (mglL) (mglL) (mgIL) (mglL) (mglL)
0.05 0.05 0 0 <0.01 <0.01 0 0
0.04 0.04 0 0 0.04 0.04 0 0
<0.01 <0.01 0 0 <0.01 <0.01 0 0
<0.01 <0.01 0 0 <0.01 <0.01 0 0
0.18 0.19 -0.01 -1 0.03 0.03 0 0
<0.01 <0.01 0 0 <0.01 0.01 0 0
<0.01 <0.01 0 0
-0.025 -2.5 0 0
71 71 100 100
86 100

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