In natural ground water systems, both chlorine and bromine occur primarily as monovalent anions, chloride and bromide. Although dissolution or precipitation of halite, biological activity in the root zone, anion sorption, and exchange can affect chloride/bromide ratios in some settings, movement of the ions in potable ground water is most often conservative. Atmospheric precipitation will generally have mass ratios between 50 and 150; shallow ground water, between 100 and 200; domestic sewage, between 300 and 600; water affected by dissolution of halite, between 1000 and 10,000; and summer runoff from urban streets, between 10 and 100. These, and other distinctive elemental ratios, are useful in the reconstruction of the origin and movement of ground water, as illustrated by case studies investigating sources of salinity in ground water from Alberta, Kansas, and Arizona, and infiltration rates and pathways at Yucca Mountain, Nevada.

Tracers are used widely to determine the direction and velocity of ground‐water movement. Failures of tracer tests are most commonly a result of incorrect choice of tracers, insufficient concentrations of tracers, and a lack of an understanding of the hydrogeologic system being tested. Some of the most useful general tracers are bromide chloride, rhodamine WT, and various fluorocarbons. For certain purposes, dyed clubmoss and baker's yeast have proved valuable. Many radionuclides including 3H, 82Br, and 198Au are almost ideal for numerous purposes, but radiation hazards associated with their use together with local, State, and Federal regulations have discouraged widespread field applications in recent years within the United States.

Objectives: This study examined the effects of testosterone treatment with or without chest reconstruction surgery (CRS) on mental health in female-to-male transgender people (FTMs). Methods: More than 200 FTMs completed a written survey including quantitative scales to measure symptoms of anxiety and depression, feelings of anger, and body dissatisfaction, as well as qualitative questions assessing shifts in sexuality after the initiation of testosterone. Fifty-seven percent of participants were taking testosterone and 40% had undergone CRS. Results: Cross-sectional analysis using a between-subjects multivariate analysis of variance showed that participants who were receiving testosterone endorsed fewer symptoms of anxiety and depression as well as less anger than the untreated group. Participants who had CRS in addition to testosterone reported less body dissatisfaction than both the testosterone-only or the untreated groups. Furthermore, participants who were injecting testosterone on a weekly basis showed significantly less anger compared with those injecting every other week. In qualitative reports, more than 50% of participants described increased sexual attraction to nontransgender men after taking testosterone. Conclusions: Results indicate that testosterone treatment in FTMs is associated with a positive effect on mental health on measures of depression, anxiety, and anger, while CRS appears to be more important for the alleviation of body dissatisfaction. The findings have particular relevance for counselors and health care providers serving FTM and gender-variant people considering medical gender transition.

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