| Abstract: | Surface-water sampling protocols of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program specify samples for most properties and constituents to be collected manually in equal-width increments across a stream channel and composited for analysis. Single-point sampling with an automated sampler (autosampler) during storms was proposed in the upper part of the South-Central Texas NAWQA study unit, raising the question of whether property and constituent concentrations from automatically collected samples differ significantly from those in samples collected manually. Statistical (Wilcoxon signed-rank test) analyses of 3 to 16 paired concentrations for each of 26 properties and constituents from water samples collected using both methods at eight sites in the upper part of the study unit indicated that there were no significant differences in concentrations for dissolved constituents, other than calcium and organic carbon. |
| Genre: | USGS Numbered Series |
| ProdID: | 5020 |
| Citation Author: | Ging, Patricia B. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 1 folded sheet (6 p.) : col. ill., col. map ; 28 x 64 cm. folded to 28 x 22 cm. col. ill., col. map ; |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Fact Sheet |
| Citation Series Code: | FS |
| Citation Series Number: | 172-99 |
| Citation Search Results Text: | Water-quality assessment of south-central Texas : comparison of water quality in surface-water samples collected manually and by automated samplers; 1999; FS; 172-99; Ging, Patricia B. |
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| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Water-quality assessment of south-central Texas : comparison of water quality in surface-water samples collected manually and by automated samplers; 1999; FS; 172-99; Ging, Patricia B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/fs_172_99.bmp |
| URL (INDEX PAGE): | http://pubs.usgs.gov/FS/Fs17299/ |
| Date Other: | Fri, 1 Jun 2001 00:00 -0500 |
| Publisher: | U.S. Geological Survey, |
