Colloids

Colloids can be classified as follows: Based on the nature of interaction between the dispersed phase and the dispersion medium, colloids can be classified as: Hydrophilic colloids: These are water-loving colloids.

Graham's study of colloids resulted in his ability to separate colloids and crystalloids using a so-called "dialyzer", using technology that is a rudimentary forerunner of technology in modern kidney dialysis machines.

However, carbon in the form of charcoal is far more stable than soil colloids and is capable of performing many of the functions of the soil colloids of sub-tropical soils.

Hydrophobic colloids: These are opposite in nature to hydrophilic colloids.

Following water and soil colloids, organic material is next in importance to a soil's formation and fertility.

Herbicide adsorption to soil colloids or organic matter often reduces its amount available for weed absorption.

Hydrogen bonding and ion exchange are two suggested mechanisms of adsorption between the nitro functional groups and soil colloids.

In 1847 he discovered that the optical properties of gold colloids differed from those of the corresponding bulk metal.

It is the surface chemistry of mineral and organic colloids that determines soil's chemical properties.

Mineral colloids; soil clays further Due to its high specific surface area and its unbalanced negative charges, clay is the most active mineral component of soil.

Most of the soil's CEC occurs on clay and humus colloids, and the lack of those in hot, humid, wet climates, due to leaching and decomposition respectively, explains the relative sterility of tropical soils.

Negatively charged sites on colloids attract and release cations in what is referred to as cation exchange.

Other colloids may be opaque or have a slight color.

Preparation There are two principal ways of preparation of colloids: Kopeliovich, Dmitri.

Radionuclides and heavy metals easily sorb onto colloids suspended in water.

Small particle sizes lead to enormous surface areas, and this effect is greatly amplified in colloids.

Soil biota can treat waste by transforming it; soil colloids can adsorb the waste material.

Soil colloids behave as repositories of nutrients and moisture and so act to buffer the variations of soil solution ions and moisture.

Soil is said to be formed when organic matter has accumulated and colloids are washed downward, leaving deposits of clay, humus, iron oxide, carbonate, and gypsum, producing a distinct layer called the B horizon.

Such clays tend to hold phosphorus so tightly that it is unavailable for absorption by plants.sfnsfnsfn Organic colloids Humus is the final state of decomposition of organic matter.