W.J. Gibbons M.E. Dorsey F.C. Wells 1990 <p>This manual provides standardized guidelines and quality-control procedures for the collection and preservation of water-quality samples and defines procedures for making field analyses of unstable constituents or properties.</p> <p>Descriptions and procedures are given for several methods of sampling for which a variety of samplers may be used. Sample-processing devices such as sample churns and filtration apparatus are discussed along with methods of cleaning.</p> <p>Analyses for unstable constituents or properties are by necessity performed in the field. This manual addresses analytical techniques and quality assurance for: (1) Water temperature; (2) specific conductance; (3) pH; (4) alkalinity; (5) dissolved oxygen; and (6) bacteria.</p> application/pdf 10.3133/ofr90127 en U.S. Geological Survey Guidelines for collection and field analysis of water-quality samples from streams in Texas reports