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Soil Contamination

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A soil contaminant is an element (also known as ‘heavy metals’ or inorganic contaminants, e.g. lead) or a chemical (also known as ‘organics’, e.g. diesel oil) present in the soil at a level that poses health risks to plant, animal or human health. Common soil contaminants include PCBs, PAHs, petroleum products, heavy metals and pesticides.

BACKGROUNDER: SOIL TESTING FOR CONTAMINANTS

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Questions people are asking related to soil

Title Author Updated Likes Comments
What groups or agencies are looking at the intersections of land/soil management and ocean pollution? @laurel_mire over 3 years ago 1
As soil and water share similar pollution problems, what research methods can be shared between them? @alejobonifacio over 3 years ago 10
What causes potholes? @Rgaude over 3 years ago 4
Where can polluted soils be placed? @amocorro over 3 years ago 0
What are people doing about polluted soils that get put back as fill? @amocorro over 3 years ago 1
Are there ways to trace detected soil contaminants back to the polluting source? @amocorro almost 4 years ago 3
Does anyone have experience with remediation of contaminated soils? What are some different options? @bhamster almost 4 years ago 7
What are other ways to assess soil contamination, besides directly measuring contaminant concentrations? @bhamster almost 4 years ago 8
Risks of PAH exposure from contaminated dust? @kgradow1 almost 4 years ago 7
What do I need to know before collecting soil for the Hanby soil testing kit? @CherokeeConcernedCitizens over 4 years ago 8
How to Take Soil Samples in a Marsh @MicahSampere about 5 years ago 2
What soil testing methods might be good for someone who lives by a highway overpass? @stevie over 5 years ago 4
Do you do Soil Testing and Analysis? @DanielleS over 5 years ago 1
How do you choose where to take soil samples when concerned about leaching of contaminants from a landfill? @DanielleS almost 6 years ago 4
Anyone have experience with diy soil testing methods for contaminants- Colorimetry, spectometry, reagents, etc? @DanielleS almost 6 years ago 1
How do you test for oil and gas-related contaminants in soils? @DanielleS almost 6 years ago 2
How do I... find more information about soil sampling @dusjagr about 6 years ago 5
We need help with garden testing after Harvey @Georgina about 7 years ago 2
When is it better to do grab sampling versus other types of monitoring? @stevie about 7 years ago 2
Where can someone send a strange substance found on their property for analysis? @bbutler about 7 years ago 9
How do I collect a sample for laboratory analysis? @warren over 7 years ago 3
What are soil sampling protocols being used by groups along the gulf coast? @stevie over 7 years ago 5
Question: Can DIY-spectrometer be used for analysis of soil @interestedperson_ha over 8 years ago 7

Information on soil contamination

Where does soil contamination come from?

We can be exposed to contaminants through the soil through:

  • skin contact: dermal exposure-e.g. pesticides
  • inhalation: breathing in dust- e.g. asbestos, lead; and/or contaminants that vaporize from soil-e.g. benzene
  • ingestion: eating of dust and soil through hand-to-mouth and to a lesser extent through eating foods grown in contaminated soil as some can uptake heavy metals

exposure_routes.jpg

With exposure to any contaminant, the likelihood that health effects will occur depends on how harmful or toxic the contaminant is to humans, how much you are exposed to, and for how long and often you are exposed.

Contaminants in soils can come from historical industrial activity, past and present land use, nearness to pollution sources (i.e. a major road, a coal plant) and natural disasters.

Contaminants can end up in your soil through:

  • the air (from dust & exhaust)
  • water (from rain & groundwater & runoff from a nearby site)
  • direct deposition (from on site (e.g. Pesticide application, burning garbage, or nearby polluters).

incinerator_emissions.jpg

Why test the soil for contaminants?

People test their soil for contaminants for a range of reasons:

  • To see if the soil is safe to grow food in and/or reduce risk of exposure to contaminants through existing or future farms and gardens.
  • To see whether contaminants may have been or are being deposited on your site through runoff (water) or air from nearby busy roads or polluting industries.
  • To see what the contaminants may have been left behind on the soil after a natural disaster such as flooding or fire, or a chemical spill.
  • To see whether remediation efforts are working.

Also see this great overview by Toxics Action Center


Common Soil Contaminants to be aware of:

Heavy metals

Heavy metals are those elements which are toxic to humans at certain concentrations, including:

  • arsenic
  • copper
  • lead
  • mercury
  • nickel
  • chromium
  • cadmium
  • zinc
  • aluminum
  • manganese
  • barium
  • molybdenum

heavy-metals-t-shirt.jpg

Some of them, like zinc and copper, are necessary or beneficial to living organisms in small concentrations but are toxic above a certain concentration; others, like lead, cadmium and mercury, serve no known biological function and are always toxic. Heavy metals are naturally occurring, found in rocks, soil systems and bedrock, and in some places a certain metal may be naturally present in higher concentrations (such as arsenic in New York State).

The majority of heavy metal contamination arises from human activity– metal mining and smelting, agrochemical fertilizers and pesticides, sewage sludge, oil and gas operations and fossil fuel burning, improper waste disposal, and fill used in residential development. Unlike organic contaminants, heavy metals cannot be broken down, so the they keep building up in soils. But their characteristics may change so that they can be more or less easily taken up by plants or animals.

Organic Chemicals

Organic contaminants are carbon-based, meaning they are derived or manufactured from something that was once alive, for example, oil and gasoline, which is the remains of plant and animal matter that was compressed for millions of years, then pumped out of the earth and processed. Polyaromatic Hydrocarbons (PAH’s) and other petroleum hydrocarbon contaminants, solvents like trichloroethylene (TCE), dioxins, chemical pesticides, and Polychlorinated Biphenyls (PCB’s) are a few organic contaminants of note. They can be present in soils, particularly on or near historical or present-day oil and gas industry, auto and machine repair shops, old or leaky oil tanks, busy roads or highways, landfills and dumps, beneath electrical stations and wires, and places where there were building fires or demolished buildings.

Polycyclic Aromatic Hydrocarbons

PAH’s are a byproduct of incomplete combustion, and are released when fossil fuels are burnt. They are common in soils along busy roads due to vehicle exhaust, and are associated with coal burning power plants, forest fires, and road sealants. Other sources of PAHs include wood burning stoves and oil spills. There are more than 15 different types of PAH’s. Some PAHs are known to be cancer-causing, or carcinogenic. They have also been associated with respiratory illnesses. In soils, PAHs are likely to stick tightly to soil and organic matter particles; though certain PAHs move through soil to contaminate underground water or volatilize into the air. PAH-Collage-2.jpg

Poly Chlorinated Bisphenols

Though they were banned in 1979, they are still present in the environment because they are highly persistent (do not readily break down) and can leak from landfills where they have been disposed of and from products that were made before the ban. They were used broadly in the electrical and building industries, and so are common in soils beneath electrical transformers and capacitators, flooded areas, and soils where buildings have been demolished. Since they don’t really break down, and bind to fats, they end up in our water and in our fish and seafood. So it’s especially important to know if they are present in places where people fish! 4-PCBs-Fish-Graphic-6.09.png

You can read more about each specific contaminant through the Agency for Toxic Substances and Disease Registry’s 2 page fact sheets, called Tox FAQ’s: [https://www.atsdr.cdc.gov/toxfaqs/index.asp ]

Activities for understanding your soil

Purpose Category Status Author Time Difficulty Replications
How to interpret soil test results - - @DanielleS - - 0 replications: Try it »
Using the Soil Sampling Toolkit - - @Bronwen - - 0 replications: Try it »
Things to Consider When Testing Soil for Contaminants - - @DanielleS - - 1 replications: Try it »
Draft: Collect a sample for laboratory analysis - - @warren - - 0 replications: Try it »
AIR-QUALITY & BALLOON LAUNCH: SUMMER 2019 QUEENSBRIDGE TECH LAB COMMUNITY SCIENCE PROJECT - - @SadiePrego - - 0 replications: Try it »
Community Soil Testing Using an Open Source Soil Sampling Toolkit - - @jjcreedon - - 0 replications: Try it »
DIY Soil Texture Tests- Learn more about your soil! - - @DanielleS - - 0 replications: Try it »
How to find out past and current uses for an area of land observe review-me @bhamster 3h easy 0 replications: Try it »
How to Test Soil for Oil & Gas Contaminants* please contribute - - @DanielleS - - 0 replications: Try it »
Subsoil sampling guide - - @imvec - - 0 replications: Try it »
Workshop Guide: Mapping Soil Data - - @kgradow1 - - 0 replications: Try it »
Understanding Soil Contamination - Key Terms & Concepts - - @DanielleS - - 0 replications: Try it »
Guía de muestreo de subsuelo - - @imvec - - 0 replications: Try it »
How to Use a Hanby Kit to Test for Soil Petroleum Hydrocarbons - - @DanielleS - - 0 replications: Try it »
Testing The PH of Soil using different liquids - - @Nature_babes - - 0 replications: Try it »

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.