Download or read book Hexavalent Chromium in the Ground Water in Paradise Valley Maricopa County Arizona written by Frederick Noel Robertson and published by . This book was released on 1975 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water resources Investigations Report written by and published by . This book was released on 1995 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geological Survey Water supply Paper written by and published by . This book was released on 1985 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Water supply Paper written by and published by . This book was released on 1982 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geochemistry of Ground Water in Alluvial Basins of Arizona and Adjacent Parts of Nevada New Mexico and California written by Frederick N. Robertson and published by . This book was released on 1989 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: See journals under US Geological survey. Prof. paper 1406-C.

Download or read book Summary Statistics and Trend Analysis of Water quality Data at Sites in the Gila River Basin New Mexico and Arizona written by S. Baldys and published by . This book was released on 1995 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study and Interpretation of the Chemical Characteristics of Natural Water written by John David Hem and published by . This book was released on 1985 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deze derde herziene uitgave op het gebied van de chemische karakteristieken van natuurlijk water (grond- en oppervlaktewater) is uitgegaan van hetzelfde basis-organisatiemodel en dient dezelfde algemene doelstellingen als voorgaande uitgaven

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1976 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1976 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Health Effects from Ground Water Usage written by J. S. Hubert and published by . This book was released on 1980 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regional Aquifer Systems of the United States Southwest Alluvial Basins of Arizona written by American Water Resources Association. Conference and published by . This book was released on 1986 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Occurrence and Treatment of Hexavalent Chromium and Arsenic in Arizona Municipal and Industrial Waters written by Alexandra Bowen and published by . This book was released on 2014 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic (As) and chromium (Cr) occur naturally in AZ surface and groundwaters, pose different health impacts, and exhibit different treatment efficacies. Hexavalent chromium (Cr(VI)) has newly recognized human health concerns, and state and federal agencies are evaluating a low Cr(VI)-specific maximum contaminant level (MCL) for drinking water. Occurrence of Cr and As in municipal drinking waters and industrial cooling tower waters was quantified by grab samples and compared with sampling results obtained from a new passive sampler developed specifically for Cr(VI). Cr(VI) and As concentrations in groundwater used for cooling tower make-up water concentrations were ~3 ppb and ~4 ppb, respectively, and were concentrated significantly in blowdown water (~20 ppb and ~40 ppb). Based upon pending Cr(VI), As, and other metal regulations, these blowdown waters will need routine monitoring and treatment. Cr(VI) concentrations in a water treatment plant (WTP) raw and finished water samples varied from 0.5 and 2 ppb for grab samples collected every 4 hours for 7 consecutive days using an ISCO sampler. The development of an ion exchange (IX) based passive sampler was validated in the field at the WTP and yielded an average exposure within 1 standard deviation of ISCO sampler grab data. Sampling at both the WTP and cooling towers suggested sources of Cr(III) from treatment chemicals or wood preservatives may exist. Since both facilities use chlorine oxidants, I quantified the apparent (pH=5) second-order rate constant for aqueous chlorine (HOCl/OCl- ) with Cr(III) to form Cr(VI) as 0.7 M-1s-1. Under typical conditions (2 ppb Cr(III) ; 2 mg/L Cl2) the half-life for the conversion of Cr(III) to the more toxic form Cr(VI) is 4.7 hours. The occurrence studies in AZ and CA show the Cr(VI) and As treatment of groundwaters will be required to meet stringent Cr(VI) regulations. IX technologies, both strong base anion (SBA) and weak base anion (WBA) resin types were screened (and compared) for Cr removal. The SBA IX process for As removal was optimized by utilizing a reactive iron coagulation and filtration (RCF) process to treat spent IX brine, which was then reused to for SBA resin regeneration.

Download or read book Open file Report written by and published by . This book was released on 19?? with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Second National Symposium on Aquifer Restoration and Ground Water Monitoring May 26 28 1982 The Fawcett Center Columbus Ohio written by David Nielsen and published by . This book was released on 1982 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book State of Arizona Water Quality Assessment for 1988 section 305 b Report written by and published by . This book was released on 1989 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Arizona Geological Society Digest written by Arizona Geological Society and published by . This book was released on 1980 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: