One drawback of organic-based products is the tendency of chemicals to leach from the matrix material, leaving parts of the surface unprotected.
The pad is used to store a mound of ore through which chemicals percolate to leach out the gold ore, which is then collected and processed into bullion.
The small chloride ion can also sometimes work its way past protective coatings and leach out soluble iron chloride salts, exposing new surfaces for attack.
The other attraction of these materials, which were developed in the 1970s, is that they continuously leach fluoride and so can help reduce the incidence of recurrent caries.
Millions of people in the Himalayas and Andes suffer from goitre and cretinism as glaciation, heavy rainfall and melting snow regularly leach mountain soils of their iodine content.
The key, once you've cleared a patch of ground, is to get something sown or planted to fill the vacuum: otherwise the winter wet will leach nutrients from the soil, and the weeds will undo your good work in a matter of weeks.
pesticides and fertilizers that leach into rivers
#6 Polystyrene can leach styrene, a possible human carcinogen that may also interfere with hormones.
pesticides that leach into rivers
Humus being highly colloidal, has the ability to adsorb and retain for future plant use many of the ions such as calcium, magnesium, potassium, phosphates and ammonia which might be leached from the soil and lost in drainage.