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Related Concept Videos

Lower GI Series: Barium Enema01:23

Lower GI Series: Barium Enema

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A Barium Enema, or a lower GI series, is a specialized radiographic examination designed to visualize the lower gastrointestinal tract, specifically the colon and rectum. This procedure is instrumental in diagnosing various conditions such as colorectal cancer, polyps, diverticulosis, and inflammatory bowel disease.
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In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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Dissolved Barium Causes Toxicity to Groundwater Cyclopoida.

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Elevated barium (Ba) in groundwater poses a risk to aquatic life. This study found dissolved Ba is toxic to groundwater crustaceans, while precipitated Ba is not, informing risk assessments.

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Area of Science:

  • Environmental Toxicology
  • Hydrogeology
  • Ecotoxicology

Background:

  • Barium (Ba) dissolution and mobilization in groundwater are primarily controlled by sulfate due to barium sulfate (BaSO4) low solubility.
  • Elevated Ba concentrations in groundwater can stem from anthropogenic activities and geogenic sources.
  • No toxicity data currently exist for Ba concerning groundwater organisms (stygofauna).

Purpose of the Study:

  • To assess the toxicity of barium to two stygobiont cyclopoid species from New South Wales, Australia.
  • To determine the influence of sulfate concentration on barium toxicity.
  • To evaluate the risk of elevated dissolved Ba concentrations to groundwater ecosystems.

Main Methods:

  • Toxicity testing of Ba on two stygobiont cyclopoid species over 28 days.
  • Experiments conducted in waters with varying sulfate concentrations (<1-100 mg SO4/L).
  • Measurement of cyclopoid survival and observation of BaSO4 precipitation dynamics.

Main Results:

  • Dissolved Ba was toxic to cyclopoids, while precipitated Ba was not toxic to the Wellington species.
  • Toxicity values for dissolved Ba included a 21-day no-effect concentration of 3.3 mg/L and an effective concentration of 4.8 mg/L for 5% mortality.
  • Sulfate presence led to rapid BaSO4 precipitation, reducing dissolved Ba until sulfate depletion.

Conclusions:

  • Elevated dissolved Ba concentrations may pose a significant risk to groundwater organisms.
  • Further toxicity testing on diverse stygobiont species is recommended for comprehensive risk assessment.
  • Developing Ba guideline values for groundwater contaminant risk assessments is crucial.