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Environmental science fair project:
Portable analysis system for heavy metal contamination detection in soil samples

Project Information
Title: Portable analysis system for heavy metal contamination detection in soil samples
Subject: Environmental Sciences
Subcategory: Soil Pollution / Engineering / Electronics / Chemistry
Grade level: High School - Grades 10-12
Academic Level: Advanced
Project Type: Experimental
Cost: Medium
Awards: 1st Place, Canada Wide Virtual Science Fair ($400)
Affiliation: Canada Wide Virtual Science Fair
Year: 2013
Materials: Drill press, metal bender, radial arm saw, vaccum pump, spectrometer, RF and DC voltage supply, Liquid-Crystal Display (LCD)
Concepts: signal-to-reference (S/R) ratio, element analytical line
Description: In order to detect and quantify the presence of heavy metal contamination in soil and plastics, a novel hollow cathode lamp was constructed where the sample is the cathode. A low-pressure discharge is created using both radio-frequency energy at 27MHz and DC excitation at 1500V to sputter and excite non-conducting samples such as soil and plastics. Light is then emitted at each element's analytical line (a wavelength that is unique to a particular element) and are used to determine a signal-to-reference (S/R) ratio for each element where the signal is the intensity of the analytical line of the target element, and the reference the intensity of a different and unrelated wavelength. This allows analysis of multiple elements simultaneously.
Link: http://www.virtualsciencefair.org/2013/csek13j
Short Background

Soil Contamination by Heavy Metals

Heavy metal pollution can arise from many sources but most commonly arises from the purification of metals, e.g., the smelting of copper and the preparation of nuclear fuels. Electroplating is the primary source of chromium and cadmium. Cadmium, lead and zinc are released in tiny particulates as dust from rubber tires on road surfaces; the small size allows these toxic metals to rise on the wind to be inhaled, or transported onto topsoil or edible plants.

Through precipitation of their compounds or by ion exchange into soils and muds, heavy metal pollutants can localize and lay dormant, which can have severe effects on the environment. Unlike organic pollutants, heavy metals do not decay and thus pose a different kind of challenge for remediation. Plants, mushrooms, or microrganisms are occasionally successfully used to remove some heavy metals such as mercury. Plants which exhibit hyper accumulation can be used to remove heavy metals from soils by concentrating them in their bio matter. Some treatment of mining tailings has occurred where the vegetation is then incinerated to recover the heavy metals.

Soil contamination or soil pollution is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals, or improper disposal of waste. The most common chemicals involved are petroleum hydrocarbons, polynuclear aromatic hydrocarbons (such as naphthalene and benzo(a)pyrene), solvents, pesticides, lead, and other heavy metals. Contamination is correlated with the degree of industrialization and intensity of chemical usage.

Historical deposition of coal ash used for residential, commercial, and industrial heating, as well as for industrial processes such as ore smelting, were a common source of contamination in areas that were industrialized before about 1960. Coal naturally concentrates lead and zinc during its formation, as well as other heavy metals to a lesser degree. When the coal is burned, most of these metals become concentrated in the ash (the principal exception being mercury).

Treated sewage sludge, known in the industry as biosolids, has become controversial as a fertilizer to the land. As it is the byproduct of sewage treatment, it generally contains more contaminants such as organisms, pesticides, and heavy metals than other soil.

In the European Union, the Urban Waste Water Treatment Directive allows sewage sludge to be sprayed onto land. The volume is expected to double to 185,000 tons of dry solids in 2005. This has good agricultural properties due to the high nitrogen and phosphate content. In 1990/1991, 13% wet weight was sprayed onto 0.13% of the land; however, this is expected to rise 15 fold by 2005. Advocates say there is a need to control this so that pathogenic microorganisms do not get into water courses and to ensure that there is no accumulation of heavy metals in the top soil.

Health consequences from exposure to soil contamination vary greatly depending on pollutant type, pathway of attack and vulnerability of the exposed population. Chronic exposure to chromium, lead and other metals, petroleum, solvents, and many pesticide and herbicide formulations can be carcinogenic, can cause congenital disorders, or can cause other chronic health conditions. Industrial or man-made concentrations of naturally occurring substances, such as nitrate and ammonia associated with livestock manure from agricultural operations, have also been identified as health hazards in soil and groundwater.

See also:

Source: Wikipedia (All text is available under the terms of the GNU Free Documentation License and Creative Commons Attribution-ShareAlike License.)

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Last updated: June 2013
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