Influences of vermicomposts on field strawberries: Part 2. Effects on soil microbiological and chemical properties

http://www.diva-portal.org/smash/get/diva2:581986/FULLTEXT01

Concentration and fractionation of heavy metals in roadside soils receiving de-icing salts

Experiments at the Allegheny and Tuscarora Mountain Tunnels of the Pennsylvania Turnpike in 1975–1979 have resulted in a comprehensive description of the airborne particulate matter associated with highway traffic. Because of strong variations of traffic composition with time, emission rates of most species were resolvable into emission rates for each of the two vehicle categories: gasoline-powered vehicles and heavy-duty diesels. Thirty-four elements were identified, accounting for all of the vehicle-derived airborne particulate mass. The principal component was carbon (elemental and organic) from exhausts of heavy-duty diesels, which comprised on the average 10%–15% of the traffic. Per vehicle-kilometer, diesels were the preponderant source of most of the other species as well. Other emissions resulted from oxidation of diesel-fuel sulfur to H2SO4 (5% of the particulate mass total for traffic overall), inorganic additives and adventitious components of fuels and motor oils (10% of the overall mass total...

Particulate Matter Associated with Vehicles on the Road

A review of the contamination of soil with lead II. Spatial distribution and risk assessment of soil lead.

Inhibition of photosynthetic electron transport in isolated chloroplasts by lead salts has been demonstrated Photosystem I activity, as measured by electron transfer from dichlorophenol indophenol to methylviologen, was not reduced by such treatment However, photosystem II was inhibited by lead salts when electron flow was measured from water to methylviologen and Hill reaction or by chlorophyll fluorescence Fluorescence induction curves indicated the primary site of inhibition was on the oxidizing side of photosystem II That this site was between the primary electron donor of photosystem II and the site of water oxidation could be demonstrated by hydroxylamine restoration of normal fluorescence following lead inhibition

Inhibition of Photosystem II in Isolated Chloroplasts by Lead

The soil adjacent to 12 highways in the Minneapolis-St. Paul metropolitan area had lead accumulations in the range of 128 to 700 ppm. The lead concentrations found were related to traffic volume and distance from the highway.

L. Hanson

Papers

Lead accumulation in soils near highways in the twin cities metropolitan area