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 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; mglL, milligrams per liter; <, value is
less than the laboratory
minimum reporting level; shaded cells represent differences greater than plus or minus 1 lowest rounding unit; lowest rounding unit is equal to the magnitude of the least significant
figure]

Dissolved phosphorus Total phosphorus Orthophosphate
Station Date 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 (mg/L) (mg/L) (mg/L) Ditt.2
Concurrent replicates
State Line 091096 0.02 0.02 0 0
Cameo 051396 <0.01 <<W 1 0 0
Gunnison at 32 Road 071895 <0.01 <0.01 0 0 0.01 0.02 -0.01 -1 0.01 0.01 0 0
East 113095 0.01 <0.01 0.005 0.5 <0.01 <0.01 0 0 <0.01 <0.01 0 0
East 051696 0.01 0.01 0 0 0.06 0.05 0.01 1 <<W 1 <<lOl 0 0
Gore 082396 0.04 0.04 0 0 0.05 0.05 0 0
Baker 081895 <0.01 <0.01 0 0 <0.01 <0.01 0 0 <0.01 <0.01 0 0
Maximum difference -0.025 -2.5 0.10 10 0 0
Percent of samples with 71 71 29 29 100 100
no difference
Percent of samples 86 57 100
within plus or minus 1
0 lowest rounding unit
c:
)> Sequential replicates
r-
=i Dotsero 032096 <0.01 <0.01 0 0 0.01 0.01 0 0
-<
0 Reed 112295 <0.01 <0.01 0 0 <0.01 <0.01 0 0
0
Z Baker 022796 <0.01 <0.01 0 0 <0.01 <0.01 0 0 <0.01 <0.01 0 0
-I
:Xl Maximum difference 0 0 :to.02 :t2 0 0
0
r-
III Number of samples with 3 3 1 1 3 3
)> no difference
s::
"tl Number of samples 3 3
r-
Z within plus or minus 1
C)
"tl lowest rounding unit
:Xl
0
C)
:Xl
)>
s::
N
Co)