### substance:

Contaminant
* Many contaminants adhere to particles and move with the sediments in the marine environment
  - are natural
  - attach to soil particles
  - have neither color nor odor
  - stick to the carbon when they contact it
* Most contaminants are sewage and bacteria, fertilizer, toxic metals, oil and grease
  - become more concentrated and dangerous as they move up the food chain
* Some contaminants are allergens at low concentrations and toxic at high concentrations
  - as hazardous when inhaled or absorbed through the skin as when swallowed
  - carcinogens
  - can remain in the water column or sediment for long periods of time
  - cause cancer in animals
  - concentrate in the fatty tissues and internal organs of fish
  - disperse quickly and others are very tenacious
  - induce the creation of extra cell receptor sites
  - pose immediate health risks, while others are more of a long term threat
* accelerate wear and multiply as they move through hydraulic systems.
* affect marine biodiversity in a number of ways.
* also interact and react with other contaminants in groundwater.
* are a possible factor responsible for poor reproductive success
  - highly varied in chemical composition and behavior
  - left on one side of the membrane while clean water flows out the other side
  - located in water
  - materials
  - noxious or common weeds, and other crop seeds
  - often present in small amounts
  - present during the active fire and some remain as residuals subsequent to the fire
  - substances that are introduced into the environment through human activity
  - unavoidably high in non-sterile products
  - unwanted influences that can destroy the integrity of fluid systems
* buildup in large predatory fish far more than in panfish.
* burn to harmless products of combustion.
* can adhere to colloids and thereby also seem dissolved in the water.
* can affect both the luminescence signal and the radioactive assay
  - finished product quality or the ability of paper machines to operate
  - phytoplankton at the base of the Bay's food web
* can also increase down time and the frequency of sheet breaks
  - reside in inaccessible pore spaces
* can be anything from ream wrapper, to a plastic cup, to tissue
  - human-induced, as from leaking fuel tanks or toxic chemical spills
  - both speed and slow the rate of sexual development
  - cause developmental problems in children
* can enter drinking water supplies from point or nonpoint sources
  - the liquid prior to capping
  - even enter cans through weakened seams or seals
  - exist naturally in foods or come from pollution
  - harm species and ecosystems and impair ecosystem services
  - include any combination of suspended solids, oils, or soluble components
  - interact with natural hormones thus altering cell activity
  - interfere with the ligase and inhibit the reaction if present
* can move down through the soil and get in the ground water
  - from land into groundwater or runoff into surface water
  - remain in the water supply at distant locations
* can spread throughout the soil and eventually enter the groundwater
  - to people, pets, soil, and groundwater
  - travel considerable distance into an aquifer in some conditions
  - vary from metals such as copper and iron, to oils and process chemicals
* come and go through the water supply.
* destroy aquatic habitats and endanger our own lives.
* don t always enter our bodies one at a time.
* enter directly into the ground water without being filtered by the soil
  - the uterus during parturition and establish infection
* found in Indiana fish include PCBs, pesticides, and heavy metals
  - include benzene, toluene, arsenic, barium, selenium, and silver
* have a history of affecting Florida's panthers.
* migrate toward respective electrodes depending upon their charge.
* move preferentially along zones of higher permeability.
* occur above and below the water table in sand and gravel, and in fractured bedrock.
* often end up in one of Texas' many creeks, streams, rivers, lakes, or bays.
* originate from a number of sources with injected samples being the most common.
* outgrow pathogens at room temperature.
* present on a surface cause an effect known as fish eye.
* produced in many nations arrive in the Arctic via wind and water currents.
* spread mostly laterally in the direction of groundwater movement.
* stick out like a sore thumb.
* still lace some meats.
* tend to build up in predators and bottom feeding fish.
* vaporize into the air bubbles and are removed from the well by the air flow.