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Scientific Investigations Report 2009–5025

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2009–5025

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Table A1. Quality-assurance results of blank, split, and replicate samples for the water quality sample collection program in flooded Caledonia Marsh, Upper Klamath Lake, Oregon, 2006.

[Abbreviations: mg/L, milligram per liter; MRL, minimum reporting level; >, greater than; –, not applicable]

Blank samples
Analyte Number of samples Percentage of
blank samples		 MRL
(mg/L)		 Number of
blank samples
> MRL		 Value of blank samples
> MRL (mg/L)
Blank Total Maximum Median
Chlorophyll a 11 148 7 0.001 7 0.007 0.005
Total phosphorus 52 207 25 .004 17 .011 .006
Total nitrogen 44 190 23 .06 18 .30 .12
Orthophosphate 61 211 29 .006 1 – .013
Ammonia 61 211 29 .01 23 .04 .02
Nitrite-plus-nitrate 61 211 29 .016 7 .052 .031
Total particulate nitrogen 12 59 20 .022 1 – .030
Total particulate carbon 12 59 20 .12 0 – –
Particulate inorganic carbon 12 59 20 .12 0 – –
Particulate organic carbon 12 59 20 .12 0 – –
Dissolved organic carbon 11 58 19 .4 7 7 .8

Split samples
Analyte Number of samples Percentage of
split samples		 Difference between split samples
Split Total Median
(mg/L)		 Median
(percent)
Chlorophyll a 8 148 5 0.006 11.38
Total phosphorus 9 207 4 .010 4.26
Total nitrogen 7 190 4 .160 6.64
Orthophosphate 8 211 4 .001 2.22
Ammonia 8 211 4 .003 12.44
Nitrite-plus-nitrate 8 211 4 .001 .45
Total particulate nitrogen 5 59 8 .070 11.76
Total particulate carbon 5 59 8 .400 12.90
Particulate inorganic carbon 5 59 8 .000 .00
Particulate organic carbon 5 59 8 .400 12.90
Dissolved organic carbon 5 58 9 .400 3.13

Replicate samples
Analyte Number of samples Percentage of
replicate samples		 Difference between replicate samples
Replicate Total Median
(mg/L)		 Median
(percent)
Chlorophyll a 9 148 6 0.021 15.38
Total phosphorus 8 207 4 .016 5.41
Total nitrogen 9 190 5 .200 4.73
Orthophosphate 6 211 3 .001 .51
Ammonia 6 211 3 .002 5.13
Nitrite-plus-nitrate 6 211 3 .001 1.05
Total particulate nitrogen 6 59 10 .270 13.50
Total particulate carbon 6 59 10 1.450 13.53
Particulate inorganic carbon 6 59 10 .000 .00
Particulate organic carbon 6 59 10 1.350 12.64
Dissolved organic carbon 5 58 9 .000 .00

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