Douglas Robinson

M. Frey

Low-Grade Metamorphism explores processes and transformations in rocks during the early stages of metamorphic recrystallization. There has been little analysis and documentation of this widespread phenomenon, especially of the substantial and exciting advances that have taken place in the subject over the last decade. This book rectifies that shortfall, building on the foundations of Low-Temperature Metamorphism by Martin Frey (1987). The editors have invited contributions from an internationally acknowledged team of experts, who have aimed the book at advanced undergraduate and graduate students as well as researchers in the field. Contributions from internationally acknowledged experts. Documents the substantial and exciting advances that have taken place in the subject over the last decade.

Low-Grade Metamorphism

M. Edwards

C. Seidel

Only limited information existed about the occurrence of boron and chromium in drinking water sources prior to this project. In addition, chromium speciation in drinking water sources was not well understood. In fact, due to analytical method deficiencies, previous field sampling experiences had resulted in total chromium concentrations less than corresponding hexavalent chromium concentrations. This project specifically addressed the following questions: . What are the analytical method challenges and sensitivities for reliable low-level detection of chromium species and boron in drinking water supplies? . What are the national occurrence patterns for chromium species and boron in drinking water sources? . What is the fate of these compounds through drinking water facilities and distribution systems? The project approach included . an investigation of analytical challenges for both chromium and boron analysis, . a review of existing occurrence data sources, . a design and an implementation of the national occurrence survey, . an analysis of the national occurrence results, and . an investigation of the fate of chromium and boron through drinking water facilities and distribution systems.

M. Frey

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