Sorption of chemical

ADsorption to a soil is when

• the chemical is bound to the outside surface of a soil particle

• the chemical moves into the interior of surface of a soil particle

• the chemical is either bound to the outside OR moves to the inside of a soil particle

Why is understanding chemical sorption to soil important?

• sorption controls chemical availability

• sorption controls leaching and movement

• sorption controls degradation of the chemical

• all of the above

Sorption of a chemical to soil is

• primarily influenced by soil microbes

• primarily influenced by plant uptake

• primarily influenced by ionic charge of the chemical

• uniformly sorbed across soils

Does soil texture influence chemical sorption?

• Yes, chemicals are more sorbed to sand particles

• Yes, chemicals are more sorbed to large soil aggregates

• Yes, chemicals are more sorbed to clay particles

• No, soil texture does not make a difference

Clay particles bind and sorb more chemical than organic matter.

• True

• False

• Clay and organic matter bind about the same amount of most chemicals

As chemical in solution increases,

• sorption usually stays about the same no matter how much is present

• sorption increases as there is more chemical to sorb

• sorption decreases as the available sites fill up

Chemicals that are positively charged,

• have higher sorption than negatively charged chemical

• have lower sorption than negatively charged chemicals

• have about the same sorption as negatively charged chemicals